Saving settings to custom configuration section in 2.0

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  - 1
    - DataRow Iteration Guys if anyone has an answer to this - i'd appreciate some assistance. the problem is not building the dataset within String Builder - so i can render it as HTML in the email msg body. the problem is - the dataset can change and return more or less columns than i have here and my DataRows, Im specifing certain Indexes. so, one time the dataset will have say, 5 rows in it and the next time it may have say 12. i'm about at the edge of my expertise right now, so any code examples from an expert would be appreciated - other wise the only thing i can think of is to build separate Stringbuilder Components and pass a number to them that corresponds with the number of columns retrieved. i've only included enough of the snippets of code in the procedure - to give clarity. i can send all if need be, but the real problem is in the aRow.Item("index") thanks again for any help. rik Public ds As DataSet Dim oMailMsg As MailMessage = New MailMessage Dim sb As New StringBuilder oMailMsg.BodyFormat = MailFormat.Html sb.Append("<p><img SRC=C:\SelectLogo.gif></p><br>") For Each aRow In ds.Tables(0).Rows sb.Append("<table border=1 cellspacing=3><tr><td>" + aRow.Item(0) + "</td>" + "<td>" + aRow.Item(1) + "</td></tr></table>") Next oMailMsg.Body = sb.ToString SmtpMail.Send(oMailMsg) ********************************************************************** Sent via Fuzzy Software @ http://www.fuzzysoftware.com/ Comprehensive, categorised, searchable collection of links to ASP & ASP.NET resources... Tag: Saving settings to custom configuration section in 2.0 Tag: 110933
  - 2
    - Running DTS Package from VB.Net but need to pass parameters I can execute the DTS Package no problem. The thing I can't get working is that there is a stored procedure within the DTS package that need 2 parameters passed to it. I thought that if I used the code to add a global variables to the DTS package those would be passed to the stored procedure but that did not work (Put this code in *** below). Any help would be appreciated. Thanks, John Here is the code I have so far: Dim oPkg As DTS.Package2 oPkg = New DTS.Package2 oPkg.LoadFromSQLServer("JCSDEVSERV", "sa", "2techy4u!", DTS.DTSSQLServerStorageFlags.DTSSQLStgFlag_UseTrustedConnection _ , , , , _ "WTSCGC Export File") ***oPkg.GlobalVariables.Item("Param1").Value = 2 ***oPkg.GlobalVariables.Item("Param2").Value = "01/22/2006" oPkg.Execute() oPkg.UnInitialize() oPkg = Nothing Tag: Saving settings to custom configuration section in 2.0 Tag: 110931
  - 3
    - Visual Studio 2005 and framework 1.1 All, I've have Visual Studio 2005, but I need to create an exe and some dlls that will work with the 1.1 framework. All my efforts to create an exe and dlls that will work on a machine without the 2.0 framework have failed. Is there a way when compiling with 2005 to have your application function on a machine with only the 1.1 framework? Thanks Stan Tag: Saving settings to custom configuration section in 2.0 Tag: 110928
  - 4
    - Generate key file in code Hi, Instead of running "sn-k" to generate a key pair, I need to generate the key file in code, is there anyone know how to generate key files in .NET code? Any help is appreciated. Gnic Tag: Saving settings to custom configuration section in 2.0 Tag: 110920
  - 5
    - Patch assembly in GAC Hi, Sorry if I don't post my question in the propper place. If so, please, direct me to the right forum. Thanks :) I have troubles building a patch (a PCP file) that propper update an assembly in GAC. I have setup1 that installs assembly ver 1.0.0.0 in GAC and setup2 that installs the same assembly ver 1.0.1.0 in GAC. When I build a MSP file according to the documentation and apply it, the previous assembly (ver 1.0.0.0) remains in the GAC. The newer one also appears in GAC. Have someone resolved the same problem? Please, help! Thanks Tag: Saving settings to custom configuration section in 2.0 Tag: 110917
  - 6
    - FileStream exception: unknown error Hi, Whenever a customer of ours runs our software on any of his laptops, we get an IOException with an Unknown Error (-1) message at every call to the System.IO.FileStream constructor. This is really annoying, as none of our other customers have this problem, and we have no information whatsoever about the error. I looked into the SSCLI code and apparently on the CreateFile an INVALID_HANDLE is returned, and a call to GetLastError returns -1. It has nothing to do with permissions of security, I think, since new FileIOPermission(secAccess, new String[] { filePath }, false, false).Demand(); (filestream.cs, line 263) doesn't throw an exception. I can understand nobody can give me a "This is it"-answer, but could someone please tell me how to debug a situation like this? This is driving me insane... Thanks, Brecht Tag: Saving settings to custom configuration section in 2.0 Tag: 110916
  - 7
    - MSDN Using Asynchronous Server Socket ? I am using the code of "MSDN-Using Asynchronous Server Socket" "ms-help://MS.VSCC.2003/MS.MSDNQTR.2004JUL.1033/cpguide/html/cpconnon-blockingserversocketexample.htm" Here try { listener.Bind(localEndPoint); listener.Listen(100); while (true) { // Set the event to nonsignaled state. allDone.Reset(); // Start an asynchronous socket to listen for connections. Console.WriteLine("Waiting for a connection..."); listener.BeginAccept( new AsyncCallback(AcceptCallback),listener ); // Wait until a connection is made before continuing. allDone.WaitOne(); } Why we use ManualResetEvent allDone = new ManualResetEvent(false); and call allDone.Reset() every time. and why not we use AutoResetEvent instead of ManualResetEvent. So not call Reset method every time. Any Reason ?. Because when i use this code in my real application as a window service, after some time (1 day or more) it reject to accept new sockets but service still running. This service installed on 20 machines which is connected via modem. But the problem occured on one or two machines. Error : No connection could be made because the target computer actively refused it Code : 10061 WSAECONNREFUSED Please help me urgently. Zeeshan Gulzar Tag: Saving settings to custom configuration section in 2.0 Tag: 110914
  - 8
    - MSDN Using Asynchronous Server Socket ? I am using the code of "MSDN-Using Asynchronous Server Socket" "ms-help://MS.VSCC.2003/MS.MSDNQTR.2004JUL.1033/cpguide/html/cpconnon-blockingserversocketexample.htm" Here try { listener.Bind(localEndPoint); listener.Listen(100); while (true) { // Set the event to nonsignaled state. allDone.Reset(); // Start an asynchronous socket to listen for connections. Console.WriteLine("Waiting for a connection..."); listener.BeginAccept( new AsyncCallback(AcceptCallback),listener ); // Wait until a connection is made before continuing. allDone.WaitOne(); } Why we use ManualResetEvent allDone = new ManualResetEvent(false); and call allDone.Reset() every time. and why not we use AutoResetEvent instead of ManualResetEvent. So not call Reset method every time. Any Reason ?. Because when i use this code in my real application as a window service, after some time (1 day or more) it reject to accept new sockets but service still running. This service installed on 20 machines which is connected via modem. But the problem occured on one or two machines. Please help me urgently. Zeeshan Gulzar Tag: Saving settings to custom configuration section in 2.0 Tag: 110910
  - 9
    - usercontrol in IE shows warning message. How to avoid? Microsoft .NET security warning Never enter personal information or paswords into a window unless you can verify and thrust the source of the request. mvendertaca@nospam.nospam I've created a usercontrol which is hosted in Internet Explorer. It with some action buttons. I could place all buttons on this usercontrol but I did not. When the user presses one of the buttons i detect some more action needs to be taken and open a dialogbox. using ShowDialog. But IE finds a usercontrol opening a dialogbox dangerous (Although the usercontrol could alsready have done anything because i have elevated its permissions using a strongname and such.) It changes the dialog icon to include a little exclamation mark and shows a balloon tooltip on this new icon stating: 'Never enter personal information or paswords into a window unless you can verify and thrust the source of the request. Souce: localhost' This is anoying, because it keeps on coming everytime the action is taken and the user has no possibility (it seems) to make this balloon not coming again and again. Can this dialog be avoided by asserting one of the permissionsets? I do not find one. Kind regards, Marc. Tag: Saving settings to custom configuration section in 2.0 Tag: 110909
  - 10
    - very short public key encryption I would like to (if possible) shuffle my licence key data with a public key encryption algorithm. Basically I wonder if it's possible to use buffer of 8 bytes long for my data. I did a quick test with RSA (below) but it (apparently) used 128 bytes long buffer. Any tips? ----- T.cs ----- using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.Globalization; using System.IO; using System.Text; using System.Security.Cryptography; // csc /nologo T.cs && t class RSACSPSample { static void Main() { byte[] data = new byte[] { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14}; RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); byte[] crypted = rsa.Encrypt(data, false); byte[] decrypt = rsa.Decrypt(crypted, false); Console.WriteLine("Crypted length "+crypted.Length); Console.WriteLine("Decrypted length "+decrypt.Length); foreach(byte b in decrypt) Console.Write("{0} ", b); Console.WriteLine(); } } -- I have taken a vow of poverty. If you want to really piss me off, send me money. Tag: Saving settings to custom configuration section in 2.0 Tag: 110908
  - 11
    - Waht is the fastest/bets? Outlook Object/CDO/Redemption/...? Hi, I'm using a thight integration with Outlook 2003 (with an Exchange server) in my VB.NET (2005) application. Until now I'm using the Outlook Object Model, but it appears to be very slow, and has some problems: - doing a Move changes the ReceivedTime of the MailItem - I can't use RichText in the MailItem.Body (only allows plain text or HTML) - some other stuff like having to use small 'tricks' to show the default signature in an email - ... So I'm looking to other ways to have an interactions with Outlook. What I basicly need to do is: - Move the currently selected mail to a specific folder, and write the data of it to a database (subject, entryid, sender, recipients, attachments, ..) - Create a new mail with a specific text, receiver, subject, attachements, and once it is send move it to a specific folder and write the same data to the database These things actually do work, but especially the first one takes too much time: on some clients more than 10 seconds!! Is their a way to speed things up? using CDO or Redemption or ...? What are the pros and cons of each way? Can they do what I need? Any help our hints would be really aprpeciated! Thanks a lot in advance, Pieter I did it now like this: Public Function AddDocMails(ByVal DocList As Generic.List(Of clsDoc)) As String Dim oApp As Outlook.Application Dim oExp As Outlook.Explorer Dim oSel As Outlook.Selection ' You need a selection object for getting the selection. Dim oFolder As Outlook.MAPIFolder Dim oItem As Outlook.MailItem Dim intGood As Integer = 0 Dim intTotaal As Integer = 0 Try oApp = New Outlook.Application oExp = oApp.ActiveExplorer ' Get the ActiveExplorer. oSel = oExp.Selection ' Get the selection. Dim intX As Integer Dim clsMail As clsDocMail oFolder = oExp.CurrentFolder intTotaal = oSel.Count For intX = 1 To (oSel.Count) Try If oSel.Item(intX).Class = Outlook.OlObjectClass.olMail Then oItem = oSel.Item(intX) clsMail = New clsDocMail(oItem, oFolder) 'save it! clsMail.Save() End If Catch ex As Exception ErrorMessage(ex, "Inner AddDocMails") End Try Next Catch ex As Exception ErrorMessage(ex) End Try oItem = Nothing oFolder = Nothing oSel = Nothing oExp = Nothing oApp = Nothing Return strF End Function Public Sub New(ByVal ItemOutlook As Object, ByVal FolderOutlook As Object) Me.New() Me.oItem = ItemOutlook Me.oFolder = FolderOutlook Me.GetMailInfo() End Sub Public Function GetMailInfo(Optional ByVal blnMove As Boolean = True) As Boolean Dim blnOk As Boolean = True Try If blnMove Then Try If (oFolder.StoreID <> clsDocShared.GlobalDoc.MyOutlookFolder.StoreID) Or (oFolder.EntryID <> clsDocShared.GlobalDoc.MyOutlookFolder.EntryID) Then 'Move it to the right folder: StoreID oItem = oItem.Move(clsDocShared.GlobalDoc.MyOutlookFolder) End If Catch ex As Exception blnOk = False Return blnOk Exit Function End Try End If 'FolderID Me.FolderID = clsDocShared.GlobalDoc.MyOutlookFolderID 'FileLink = MailLink = EntryID Me.FileLink = oItem.EntryID 'From and to etc... Me.MailFrom = oItem.SenderName If oItem.To IsNot Nothing Then Me.MailTo = oItem.To End If If oItem.CC IsNot Nothing Then Me.MailCC = oItem.CC End If If oItem.BCC IsNot Nothing Then If Me.MailCC Is Nothing Then Me.MailCC = "" End If If Me.MailCC.Length > 0 Then Me.MailCC = Me.MailCC & ", " End If Me.MailCC = Me.MailCC & oItem.BCC End If If oItem.Subject IsNot Nothing Then Me.MailSubject = oItem.Subject End If Me.MailDate = oItem.ReceivedTime Me.AddDate = Me.MailDate Dim intA As Integer 'premier Type identification '?oitem.MessageClass = -> FAX '?oitem.MessageClass = -> MAIL Dim strI As String If oItem.MessageClass = "IPM.FAX" Then 'received strI = "FAX" Else strI = "MAIL" End If If (strI = "MAIL") And (oItem.Recipients.Count > 0) Then If oItem.Recipients.Item(1).AddressEntry.Type.ToString = "FAX" Then 'send strI = "FAX" ElseIf oItem.SenderName = "FAXINSDX" Then 'een fax wordt soms doorgemaild naar iemand!!! strI = "FAX" End If End If Me.MailType = strI If oItem.Attachments.Count > 0 Then Me.MailType = Me.MailType & ".ATTACHMENT" Me.Attachments = "" For intA = 1 To oItem.Attachments.Count If intA > 1 Then Me.Attachments = Me.Attachments & ", " End If Me.Attachments = Me.Attachments & oItem.Attachments.Item(intA).FileName.ToString Next End If If oItem.FlagStatus = Outlook.OlFlagStatus.olFlagMarked Then Me.Flag = "1" ElseIf oItem.FlagStatus = Outlook.OlFlagStatus.olFlagComplete Then Me.Flag = "2" End If If oItem.Importance = Outlook.OlImportance.olImportanceHigh Then Me.Flag = "1" End If Catch ex As Exception blnOk = False ErrorMessage(ex, "GetMailInfoDebug: " & strStatus) End Try Return blnOk End Function Tag: Saving settings to custom configuration section in 2.0 Tag: 110907
  - 12
    - Download Visual Studio 2005 Full http://www.childao.com Tag: Saving settings to custom configuration section in 2.0 Tag: 110906
  - 13
    - "Couln't find library MSVCR80.dll" with ASP.Net 2.0 Hey guys, I just installed .Net Framework 2.0 and it broke one of the applications that I develop. Here is the error message: Executable C':\Program Files\Ticketwizard\MyApp.exe\ had the following unrevoerable error: Couln't find library MSVCR80.dll (required by 'C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_perf.dll) Now, the funny thing is my app doesn't use this library at all. Does anybody have an idea? Thanks, Christoph Tag: Saving settings to custom configuration section in 2.0 Tag: 110905
  - 14
    - COM object with CLSID {...} is either not valid or registered - He Hi Friends I have a VB6 dll for ftp file to a remote server (third-party, free dll). Now I migrate the application to VB.net and so I Add the vb6 dll in Reference -> Switch to COM tab, a corresponding Interop is created. Then I run the application in my machine and it works fine. But when I move to QA environment, the above exception is thrown. I then try to register the interop using regasm in QA machine but the same exception is thrown. Would that mean the QA machine miss any dll that present in my machine, say, some dll required by the third-party dll? Many thanks in advance!! Best Regards Tom Tag: Saving settings to custom configuration section in 2.0 Tag: 110904
  - 15
    - SetOwner The security identifier is not allowed to be the owner of this object This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C626CD.2EE77630 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Im trying to set the ownership of a folder to a group called SecGroup. = If I try this code I get an error. =20 "The security identifier is not allowed to be the owner of this object" I can set this group to the owner via the gui fine.=20 path =3D "c:\test\" Dim dinfo As New DirectoryInfo("c:\test\") 'Dim dir As New DirectorySecurity("c:\test\", = AccessControlSections.Owner) Dim dir As DirectorySecurity =3D dinfo.GetAccessControl() dir.SetOwner(new NTAccount("DOMAIN\SecGroup")) dinfo.SetAccessControl(dir) Please Help Thanks Matt ------=_NextPart_000_0006_01C626CD.2EE77630 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2802" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face=3DArial size=3D2>Im trying to set the ownership of a = folder to a=20 group called SecGroup. If I  try this code I get an = error.</FONT></DIV> <DIV><FONT face=3DArial size=3D2>    </FONT> <P><FONT face=3DArial size=3D2>"The security identifier is not allowed = to be the=20 owner of this object"</FONT></P> <P><FONT face=3DArial size=3D2>I can set this group to the owner via the = gui fine.=20 </FONT></P></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><BR> path =3D=20 "c:\test\"<BR>        Dim dinfo As = New=20 DirectoryInfo("c:\test\")<BR>        = 'Dim dir=20 As New DirectorySecurity("c:\test\", = AccessControlSections.Owner)</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial = size=3D2>        Dim dir=20 As DirectorySecurity =3D dinfo.GetAccessControl()</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT><BR><FONT face=3DArial=20 size=3D2>        dir.SetOwner(new=20 NTAccount("DOMAIN\SecGroup"))<BR>      =20 dinfo.SetAccessControl(dir)<BR></FONT><FONT face=3DArial = size=3D2></FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Please Help</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Thanks</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Matt</FONT></DIV></BODY></HTML> ------=_NextPart_000_0006_01C626CD.2EE77630-- Tag: Saving settings to custom configuration section in 2.0 Tag: 110901
  - 16
    - How to add stored procedure to crystal report? I use visual studio 2003, with VS2003, I add new item (crystal report) to project. Under, report designer, I connected local sql server 2000 (MSDE), in the database fields folder, only have tables and views, where is the stored procedures? I must use SP to generate reports, how to add SP to reports? Tag: Saving settings to custom configuration section in 2.0 Tag: 110897
  - 17
    - Register insertion of USB drives in .NET 1.1 Hi there, I'm trying to write something in VB.NET that registers the insertion of a USB device (specifically a USB flash drive) and acts upon the event. I've done some reading up and it seems that using ManagementEventWatchers is the way to go, yet using the code below in a test project, I find that inserting a USB drive triggers up to about 5 events instead of just the 1 I'm expecting. If anyone could point out the error of my ways that'd be great. Cheers Paul Taylor Imports System.management Public Class Form1 Inherits System.Windows.Forms.Form .. Dim query As WqlEventQuery Dim WithEvents watch As ManagementEventWatcher Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load query = New WqlEventQuery("Select * from Win32_DeviceChangeEvent") watch = New ManagementEventWatcher(query) watch.Start() End Sub Private Sub w_EventArrived(ByVal sender As Object, ByVal e As System.Management.EventArrivedEventArgs) Handles watch.EventArrived MsgBox("Event!") End Sub End Class Tag: Saving settings to custom configuration section in 2.0 Tag: 110894
  - 18
    - Stop 0x000000E0 param: 0x00000001, 0x80000003, 0x00008080, 0x80e92000 Hello. Ok. I have the job of fixing an ibm thinkpad 600e model 5A0 and have a weird problem. I was running xp quite successfully albeit slowly without any issues until I turned it on and now I am getting a stop error. Stop: 0x000000E0 param: 0x00000001, 0x80000003, 0x00008080, 0x80e92000 I am a bit techy and have the job of fixing it :( I know that the stop error error 0x000000E0 refers to the ACPI bios. However it works in safe mode and other os and indeed xp until recently. The bios version is : INET24WW, 05/24/1999 I know this could be updated but I hate the idea of updating the bios (in case it goes wrong) and it worked before. However, When running a test on the system board using the bios it reports an error: DEV 001 ERR 91 FRU 3610 I am not too sure what these errors refer too but believe it's something to do with the battery. Besides, if there was an hardware error inside the bios wouldn't it also fail in safemode? Another sceptical moment! Of course, I have tried running msconfig and disabling all startup items and have disabled all options in win.ini, boot.ini etc. I have managed to do this from safe mode. I cant run sfc /scannow cos its in safemode or system restore as it generates an error, indeed getting into the event logs results in an error so I have the stop errors to work from. The people who owned this machine also has a lot of documentation on here. There is no built in nic card and I cant install anything else until I sort out the other stuff. The only real option I could do is use a ubuntu live cd and hope I can mount it and copy stuff over!!!!!! So, if anyone can provide a solution that does not require reinstalling, it would be greatly appreciated. Cheers John -- www.integrated-dev-sol.co.uk Remove 123 from email address to reply. Anti spam and virus measure. Tag: Saving settings to custom configuration section in 2.0 Tag: 110887
  - 19
    - Making a Winforms app behave like a Console app I am attempting to add a "console mode" to my Winforms app. My intention is that when I start the app with a special switch (for example "myapp.exe /batch") to does not launch a graphical UI but instead just displays console messages. My first guess was to simply change the Main method of the startup class to do something like this... if (batchMode) { Console.WriteLine("Now in batch mode"); ... } else { MainForm.Run(); // Launch graphical user interface } Unfortunately, it looks like my app does not behave like a real console mode app in either case. When I execute the app from the command line, the app returns immediately and text output by Console.Write() does not appear anywhere. Setting the app as a Console mode application does not give me what I want either. With this mode, a big black console output box appears even when in "GUI mode". Is there a way to build one executable that supports both modes and dynamically switches at runtime? Tag: Saving settings to custom configuration section in 2.0 Tag: 110881
  - 20
    - Assembly Security Is it possible to create an assembly (Namespace A) and set it so only certain assembly can load it and invoke methods on it. For example, only Namespace B and Namespace C would be able to invoke Namespace A because of this security setting. Is this possible? if yes I would really appreciate it you could let me know if possible or not and how? Many thanks! Evian Tag: Saving settings to custom configuration section in 2.0 Tag: 110879
  - 21
    - Is there an API for Windows Backup? Looking for a somewhat easy way to do what windows backup does for backing up the "System State". Tag: Saving settings to custom configuration section in 2.0 Tag: 110877
  - 22
    - Can I bind DataGridView to xml? I need DataGridView to display xml data with the ability of insert delete and update xml back. It is pretty easy to populate DataGridView programatically === grdMain.ColumnCount = 2; grdMain.Columns[0].Name = "Release Date"; grdMain.Columns[1].Name = "Track"; string[] row0 = { "11/22/1968", "29" }; string[] row1 = { "4/4/1960", "6" }; DataGridViewRowCollection rows = grdMain.Rows; rows.Add(row0); rows.Add(row1); === somthing like that... But is there a better way? For example, I can load xml to a DataSet and then bind DataGridView to the DataSet, etc... Thanks, -Stan Tag: Saving settings to custom configuration section in 2.0 Tag: 110872
  - 23
    - Event name from EventHandler or Delegate? I have an application in which I need to fire an event from some class other than the one that has defined the event. I am trying to do this by finding the delegate associated with the event in question, and then by calling GetInvocationList() and invoking each EventHandler in turn. And although I've found some nice links to back-door techniques on how to retrieve a delegate for a given event, those techniques don't seem to work for me. I've figured out an alternative method, but it's not quite working the way I want it to...yet. Alex Feinman (http://www.opennetcf.org/PermaLink.aspx?guid=4cf118ee-5668-452e-af2c-f3a0c6d43a7f) and others have suggested a technique where you cycle through the private fields of a type looking for one that has the same name as the event of interest. For example, to find the delegate for the Click event for button1, and then emulate the button-click event on that button: Type t = typeof(Control); FieldInfo fi = t.GetField("Click", BindingFlags.NonPublic | BindingFlags.Instance); Delegate handler = fi.GetValue(button1) as Delegate; foreach (Delegate d in handler.GetInvocationList()) { d.Invoke(button1, new EventArgs()); } Only trouble is, this doesn't work for me. I can't find this private field. What "almost" works instead is something like the following, but it returns *all* delegates, and by, extension, all event handlers, for the associated control, not just the ones associated with the Click event or some other event of interest. So my question is, given an instance of an EventHandler or Delegate, is it possible to determine which Event that EventHandler or Delegate is associated with? // button1 is defined as a Button, and it has added an EventHandler // to the chain of handlers that handle the Click event. It has also // defined some handlers to handle other events and has added those // handlers to the chain of handlers associated with those other // events. Every non-null delegate for the control is returned by // findDelegates(), not just the Button.Click event delegate. ArrayList allDelegates = findDelegates(button1); // The following will cycle through ALL delegates. not just the ones // associated with the Click event. This is not good.... foreach (Delegate del in allDelegates) { Delegate[] theseDelegates = del.GetInvocationList(); foreach (EventHandler thisHandler in theseDelegates) { thisHandler.Invoke(buttonDemo, new EventArgs()); } } // What I would like to do: // Delegate buttonClickDelegate = findDelegateFor(button1, "Click"); // and then invoke this delegate's handlers as above. ... protected ArrayList findDelegates(object o) { ArrayList rc = new ArrayList(); // Event-handler information for a given instance // of an object should be accessible through a private field // of type EventHandlerList. And this field probably won't // be defined for the current class type of object o. // The field will probably be defined as part of a base // class that is buried several classes deep in the // inheritance chain. // findFieldType will recurse through the type tree for // the caller-specified object until it finds a field of type // EventHandlerList FieldInfo f = findFieldType(o.GetType(), typeof(EventHandlerList)); if (null == f) { return rc; } EventHandlerList ehl = (EventHandlerList)f.GetValue(o); if (null == ehl) { return rc; } // The EventHandlerList class doesn't expose what we need. // We need to get to the private fields...to the contents of the // linked list that is contained within the class. Each entry in // the linked list is of type ListEntry (a private nested class // apparently defined within EventHandlerList) and represents // one delegate. The event handlers for that delegate can then // be accessed using the publicly visible GetInvocationList() // method. FieldInfo headFieldInfo = ehl.GetType().GetField("head", BindingFlags.NonPublic | BindingFlags.Instance); if (null == headFieldInfo) { return rc; } object headField = headFieldInfo.GetValue(ehl); // findDelegate will populate the caller-supplied ArrayList with // all delegates in the linked listed headed by headField. // What we really need is a way to get only those delegates // associated with a specific event. findOneDelegate(headField, ref rc); return rc; } /// <summary> /// Walk through the linked list represented by the caller-supplied /// ListEntry object and extract delegates from that list. /// Each event exposed by a given control is represented by one linked /// list entry. There may be multiple delegates to handle the event, /// but those delegates are retrieved using the GetInvocationList() /// method and not by using this back-door stuff. /// </summary> /// <param name="o">A linked-list entry of type ListEntry</param> /// <param name="delegateList">A reference to a delegate list ArrayList /// that is recursively populated</param> protected void findOneDelegate(object o, ref ArrayList delegateList) { if (null == o) { return; } object next = null; foreach (FieldInfo fx in o.GetType().GetFields( BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)) { object thisObj = fx.GetValue(o); // thisObj is of type ListEntry. It has 3 fields: // next -- the next ListEntry in the linked list, // key -- an object. Obviously this identifies the event, but how?? // delegate -- a delegate if (fx.Name.ToLower() == "next") { next = thisObj; } if (fx.Name.ToLower() == "key") { Trace.WriteLine("Key type: " + thisObj.GetType().Name + "; hashcode: " + thisObj.GetHashCode().ToString()); } if (fx.FieldType.Name.ToLower() == "delegate") { delegateList.Add((Delegate)thisObj); } } if (next != null) { findOneDelegate(next, ref delegateList); } } Tag: Saving settings to custom configuration section in 2.0 Tag: 110869
  - 24
    - Changing selected index of dropdown is not reflected when posted back? Hi all, Using .Net Framework 1.1 (with latest patch), I have a page with your typical DropDownList control. There is logic that causes the selected value (or selected index) of the drop down to be reset or changed via javascript. This happens great on the page, but when the I try to access the DDL.SelectedValue on the server, the value is always the option that was initally set. Even if I manually select an item prior to the javascript "re-selecting", the selected value is the initial value. Any ideas? TIA, Alex Tag: Saving settings to custom configuration section in 2.0 Tag: 110867
  - 25
    - COM interoperability I want to use a Class Library (DLL) on ASP .NET (2003). I'm using JavaScript on the client side. My web must sign documents and I want to call some functions from the class i have created. I have no problems if i call the Capicom dll from javascript but if i call my class I cannot use it and there are some errors: <script lang="javascript> var a = new ActiveXObject("CAPICOM.Certificate"); //No problem But, if i want to use my class "signLibrary" When I use var b = new ActiveXObject("signLibrary.Certs") there's an error on the javascript </script> How do i have to call the library? How do i have to create the library for using it on the website without errors? How do i have to reference it from the website? Is there any other solution to do this? Thank you Tag: Saving settings to custom configuration section in 2.0 Tag: 110854
- Next
  - 1
    - Obfuscation Hi group I need a professional code obfuscation solution. I know tool exists, which one is the best quality/price rate according to you ?? Thank you guys ROM Tag: Saving settings to custom configuration section in 2.0 Tag: 110852
  - 2
    - Aborting a thread while on sleep Hi, I have a thread which runs in a loop. Between each loop cycle it sleeps for 10 seconds. The problem is that if i'm aborting the thread during its sleep, the thread will be aborted only after the sleep time is over meaning it can be up to 10 seconds. Is there a way to force the abortion immediately without waiting for the sleep to be over?? I'm using the following 2 lines to abort: myThread.Abort(); myThread.Join(); Thanks! Tag: Saving settings to custom configuration section in 2.0 Tag: 110850
  - 3
    - running .net dll from ISAPI extension I have a .net application. When trying to run it from ISAPI extension, the application can not conncet to the web services. The first errors are about writing to c:\winnt\temp. After giving 'everyone' permissions to write to c:\winnt\temp, the next error is: Cannot execute a program. The command being executed was "c:\winnt\microsoft.net\framework\v1.1.4322\csc.exe" /noconfig @"C:\WINNT\TEMP\5ddmhvd1.cmdline". How can I fix it? The application uses: WS.Credentials = CredentialCache.DefaultCredentials; Tag: Saving settings to custom configuration section in 2.0 Tag: 110847
  - 4
    - Outlook.MaiIteml.Move: The RPC server is not available Hi, On the pc of one of my clients (W2000, Office 2003) I'm getting sometimes an exception when moving (Move) a MailItem to an Outlook-Folder: The RPC server is not available. (Exception from HRESULT: 0x800706BA). The client has all the updates/service packs/ etc isntalled... Does anybody has any idea why this happens? Any help our hints would be really appreciated! what is that RPC server thing? Thanks a lot in advance, Pieter This is what I do in my application (VB.NET 2005): Private oItem As Outlook.MailItem strStatus = "MOVE" If (oFolder.StoreID <> clsDocShared.GlobalDoc.MyOutlookFolder.StoreID) Or (oFolder.EntryID <> clsDocShared.GlobalDoc.MyOutlookFolder.EntryID) Then 'Move it to the right folder: StoreID strStatus = "MOVE1" oItem = oItem.Move(clsDocShared.GlobalDoc.MyOutlookFolder) strStatus = "MOVE2" End If The whole exception: The RPC server is not available. (Exception from HRESULT: 0x800706BA) at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at Microsoft.VisualBasic.CompilerServices.VBBinder.InvokeMember(String name, BindingFlags invokeAttr, Type objType, IReflect objIReflect, Object target, Object[] args, String[] namedParameters) at Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType, String name, Object[] args, String[] paramnames, Boolean[] CopyBack) at Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack) at DocControl.clsDocMail.GetMailInfo(Boolean blnMove) Tag: Saving settings to custom configuration section in 2.0 Tag: 110845
  - 5
    - Need Help Desparately hey guys, i'm in need of some serious help here. i've got a project with little time to research and barely enough time to code. i know this may sound simple to you guys, and that's great. all help is appreciate and i'm picking up lunch for this. the .exe will run as a service and seach a database every 60 seconds for records based on a condtion. if condition exists, fetch the records and send an email. i need to retrieve these records from a database as a dataset or datatable and then put those records in the Body of an email. i have to display them in table form + insert a logo as well. and im thinking i need to use something like. oMailMsg.BodyFormat = MailFormat.Html i've had no success embedding the .jpg in the email when i dont use MailFormat.Html. my Problem is handling the data retrieved - since it will be a collection and needs to fit neatly in a table w/ borders format. thanks for any help rik Can Anyone help or direct me to a solution that can do this? ********************************************************************** Sent via Fuzzy Software @ http://www.fuzzysoftware.com/ Comprehensive, categorised, searchable collection of links to ASP & ASP.NET resources... Tag: Saving settings to custom configuration section in 2.0 Tag: 110843
  - 6
    - ftpWebRequest How can I upload some data to an FTP server, if the data is in a memory string? Tag: Saving settings to custom configuration section in 2.0 Tag: 110840
  - 7
    - Creating an Add-In for my own .NET App Hi, I've written a small WinFom .NET app which compiles into a an exe. I now would like to access this app's object model from another app. What the best approach for this? Thanks in advance for any advice Anthony -- Anthony Malt Tag: Saving settings to custom configuration section in 2.0 Tag: 110838
  - 8
    - Any class to read/play mpeg videos? Is they any class I can use to read/play mpeg videos? Thanks Tag: Saving settings to custom configuration section in 2.0 Tag: 110825
  - 9
    - Common Language Runtime Debugging Services Hi Friends, Some times in some machines my applications are crashed suddenly an closed. I got the following error.. Myapp.exe: Common Language Runtime Debugging Services Application thar generated an exception that could not be handled. Process Id:0x998 (2456), Thread id=0x9a0 (2464). Click OK to terminate the application. Click CANCEL to debug the service. I have already made some changes in my syetem. My computer is Intel Pentium 4 1.76 GHZ. My computer memory is 256MB RAM. My virtual memory config is 2048:4096. Dotnet framework 1.1 All DotNet security measures are given to the system. Please help me to sort out this issue. Thanks, Vishwa -- vish ----------------------------------------------------------------------- vishy's Profile: http://www.hightechtalks.com/m86 View this thread: http://www.hightechtalks.com/t234756 Tag: Saving settings to custom configuration section in 2.0 Tag: 110824
  - 10
    - Get Rich Take advantage of a great deal Tag: Saving settings to custom configuration section in 2.0 Tag: 110823
  - 11
    - Need help urgently!!! My application needs to open a document(word,excel,pdf) in webform and then if user edits the document then save the edited document back to the database.How can i save the edited back to database that is displayed in IE on a button click Tag: Saving settings to custom configuration section in 2.0 Tag: 110821
  - 12
    - Design Pattern? Hi, I'm not an expect in .NET, so would anyone know an answer a design pattern for the following? There are many customers that require minor customizations to the program I will be developing. I would like to reuse the majority of the functionality of this program since each customer is only requiring certain changes to this program. Is there a way to design this so that the main base, skeleton of the program is seperate from the customization and the different customizations can be loaded like a snap on module? Sort of like a SNES game system, and each cartridge makes the console provide a differnt type of service? Is there a design pattern for this? Thanks! Tag: Saving settings to custom configuration section in 2.0 Tag: 110819
  - 13
    - Error: COM object that has been separated from its underlying RCW can not be used. I have a smartclient app in vb.net 1.1. In the app's startup form's form_load event I have some code that gets the machine's MAC address which I think is the culprit here. The code runs fine on my dev machine and as far as I know it runs OK on the client machines it gets installed on. I now have a test machine which is a brand new dell with WinXP sp2 and ALL windows updates (including the .net framework 1.1 and all relate SPs and updates, but not .net 2.0). I have not installed MS Office or any other apps on it so it is a very clean machine. my smart client app installs OK on the test machine, but when it starts up I get the following Error: <<< System.Management.ManagementException: COM object that has been separated from its underlying RCW can not be used. System.Runtime.InteropServices.InvalidComObjectException: COM object that has been separated from its underlying RCW can not be used. at system.Management.IEnumWbemClassObject.Clone_(IEnumWbemClassObject& ppEnum) at system.Management.ManagementObjectCollection.GetEnumerator() >>> and here's the code where I think the problem is, however, I'm not getting the exact line of code in the exception: Dim mc As System.Management.ManagementClass Dim mo As System.Management.ManagementObject mc = New System.Management.ManagementClass("Win32_NetworkAdapterConfiguration") Dim moc As System.Management.ManagementObjectCollection = mc.GetInstances() Dim found As Boolean For Each mo In moc If CType(mo.Item("IPEnabled"), Boolean) = True Then If mo.Item("MacAddress").ToString() = "bla bla bla" Then found = True Exit For End If End If Next Can anyone tell me why I would get this error on a clean machine? And how should I write this correctly to avoid this error? -- moondaddy@nospam.nospam Tag: Saving settings to custom configuration section in 2.0 Tag: 110818
  - 14
    - do I need the .NET framework? Many pardons if this is the wrong group to ask this question. After replacing a failed hard disk, I installed XP home and all critical updates including SP 2. When I try to install Office 2000 premium, it can't find several DLL files and eventually fails to install. When I run windows update, it shows .NET 1.1 and 2 in the available updates. Does this mean that I do not have .NET of any version installed and if so could this keep office 2000 premium from installing? Office 2000 premium was working well before the disk failure. I don't know why I can't install it now. Any help or referral to the proper group is appreciated. -- woof, Fourdogs No trees were destroyed to post this message, however millions of electrons were terribly inconvenienced. Tag: Saving settings to custom configuration section in 2.0 Tag: 110815
  - 15
    - problems turning off LoaderLock MDA i've got a test WinForm executable that instantiates a DirectSound object in the Forms constructor, so it gives me the LoaderLock MDA exception. following the instructions here : http://msdn2.microsoft.com/en-us/library/d21c150d(en-US,VS.80).aspx i've run the registry script to disable all MDAs and also created the AppName.exe.mda.config file with loaderLock enable="false" ... but i'm still getting the MDA warning when in VS 2005 and doing debug-start debugging. the only thing that works for me is if i have run the disable script and turn on the 'enable unmanaged code debugging' checkbox. first question, why do i have to run the registry script and 'enable unmanaged code debugging' to get it to go away. second question, why is the AppName.exe.mda.config not working? i tried doing this logic in another thread that was created in the constructor, but i get the same error. third question, what is the proper way to get around this problem in code, without having to change the environment? Thanks, casey http://www.brains-N-brawn.com Tag: Saving settings to custom configuration section in 2.0 Tag: 110807
  - 16
    - =?Utf-8?Q?Process=E2=80=99s_commandline_shown_on_d?= I created a simple console program to display processâ??s pid, caption, and commandline using (see the source code below). If I compile it and run it from console, some of processâ??s commandline is missing. However, if I set the break point at the end of the program and just run it (F5) with debugging. All the porcessâ??s commandline missed before are appeared. Any one has idea? Could this be bug on WMI? Partial result from runtime: ===================== 1660 XFR.EXE C:\WINDOWS\system32\cba\xfr.exe 2004 itnaming.exe 204 itnode_daemon.exe 1476 METERW32.EXE C:\LDClient\meterw32.exe 912 ntvdm.exe "C:\WINDOWS\system32\ntvdm.exe" -f -i1 -w -a C:\WINDOWS\system32\krnl386.exe 3904 naPrdMgr.exe 3624 OUTLOOK.EXE "C:\PROGRA~1\MICROS~3\OFFICE11\OUTLOOK.EXE" /recycle Partial result from debug time: ======================= 1660 XFR.EXE C:\WINDOWS\system32\cba\xfr.exe 2004 itnaming.exe "C:\Iona\OrbixE2A-ASP-6.03-StdEd\asp\6.0\bin\itnaming.exe" â??ORBproduâ?¦ 204 itnode_daemon.exe "C:\Iona\OrbixE2A-ASP-6.03-StdEd\asp\6.0\bin\itnode_daemon.exe" â??ORBâ?¦ 1476 METERW32.EXE C:\LDClient\meterw32.exe 912 ntvdm.exe "C:\WINDOWS\system32\ntvdm.exe" -f -i1 -w -a C:\WINDOWS\system32\krnl386.exe 3904 naPrdMgr.exe C:\PROGRA~1\NETWOR~1\COMMON~1\naPrdMgr.exe -Embedding 3624 OUTLOOK.EXE "C:\PROGRA~1\MICROS~3\OFFICE11\OUTLOOK.EXE" /recycle Source Code: =========== string sID, sCaption, sCommandLine; ManagementObjectSearcher query = null; ManagementObjectCollection queryCollection = null; // Get only for my local machine query = new ManagementObjectSearcher( @"\\.\root\cimv2","SELECT * FROM Win32_Process"); try { queryCollection = query.Get(); } catch(Exception ex) { System.Console.WriteLine("Cannot query processes. " + ex.ToString()); return; } foreach( ManagementObject mo in queryCollection ) { sID = ""; sCaption = ""; sCommandLine = ""; try { sID = mo["ProcessId"].ToString().Trim(); } catch (Exception ex) { System.Console.WriteLine("Failed to get process id. " + ex.ToString()); //continue; } try { sCaption = mo["Caption"].ToString().Trim(); } catch (Exception ex) { System.Console.WriteLine("Failed to get caption. " + ex.ToString()); //continue; } object o = null; try { o = mo["CommandLine"]; if( o != null ) { sCommandLine = o.ToString().Trim(); } } catch (Exception ex) { System.Console.WriteLine("Failed to get command line. " + ex.ToString()); //continue; } System.Console.WriteLine( String.Format("{0,8} {1,-22} {2,-256}", sID, sCaption, sCommandLine)); } // end foreach Tag: Saving settings to custom configuration section in 2.0 Tag: 110806
  - 17
    - IIS Management Hi, Can I manage IIS from the .NET framework, how can I do that?? thnks. -- __________________ Luis Graillet Ramos Tag: Saving settings to custom configuration section in 2.0 Tag: 110804
  - 18
    - Problems authenticating server for SSLStream negotiation This is absolutely driving me nuts. Any hints would be GREATLY appreciated. I am trying to negotiate a clear channel socket to SSL. Thing is it works great on two development computers, but falls flat on its face when I go to deploy to a server. I have written both CLIENT and SERVER for FTP. When the client issues the appropriate command I call the SSLStream.AuthenticateAsClient, while at the same time the server is calling SSLStream.AuthenticateAsServer. I have played with using a number of different host names on the client side, to no avail. On the server side I reconstitute the server certificate from the registry, where I have it stored as a binary block of data. A utility loads the PFX file, which includes the private key, then stores that in the registry. Later, when the FTP server starts I load the binary data, and use it to construct the Certificate, which is eventually used to negotiate SSL. The PFX was built at the server by importing our certificate, and then exporting to PFX, supplying the password, choosing to include the private key, and to NOT delete the key after export. On the two development computers that I went through all of these steps on (using the PFX generated at the production server), it all works wonderfully. When I do the same at two different servers, the negotiation fails. SChannel errors are logged in the system event log. Event ID 36870, "A fatal error occurred when attempting to access the SSL server credential private key. The error code returned from the cryptographic module is 0x80090016." When the FTP service starts I pull the certificate from the registry as described above, and verify the chain. All 3 elements on the chain are valid. The server call to AuthenticateAsServer crashes as such: 09:16:44.97 NegotiateSSLServer unable to authenticate. 09:16:44.99 - System.ComponentModel.Win32Exception: The credentials supplied to the package were not recognized 09:16:44.99 at System.Net.SSPIWrapper.AcquireCredentialsHandle(SSPIInterface SecModule, String package, CredentialUse intent, SecureCredential scc) 09:16:44.99 at System.Net.Security.SecureChannel.AcquireCredentialsHandle(CredentialUse credUsage, SecureCredential& secureCredential) 09:16:44.99 at System.Net.Security.SecureChannel.AcquireServerCredentials(Byte[]& thumbPrint) 09:16:44.99 at System.Net.Security.SecureChannel.GenerateToken(Byte[] input, Int32 offset, Int32 count, Byte[]& output) 09:16:44.99 at System.Net.Security.SecureChannel.NextMessage(Byte[] incoming, Int32 offset, Int32 count) 09:16:44.99 at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) 09:16:44.99 at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) 09:16:44.99 at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) 09:16:44.99 at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) 09:16:44.99 at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) 09:16:44.99 at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) 09:16:44.99 at System.Net.Security.SslStream.AuthenticateAsServer(X509Certificate serverCertificate, Boolean clientCertificateRequired, SslProtocols enabledSslProtocols, Boolean checkCertificateRevocation) 09:16:44.99 at ODP.NMServe.TCPClientSSL.NegotiateSSLServer(X509Certificate2 Certificate, Boolean ClearReceiveBuffer) Tag: Saving settings to custom configuration section in 2.0 Tag: 110799
  - 19
    - Class name of Static function Hi, Anybody know if it is possible for a static function to work out, at runtime, what class it belongs to? TIA, Pete Tag: Saving settings to custom configuration section in 2.0 Tag: 110792
  - 20
    - deploying wrapped dlls Hello The application I'm building an installer for uses dlls which were developed originally in C. Since the application itself is developed in C#, these dlls were wrapped using SWIG. Initially, the machine environment variables were set to enable code development; however, I am facing problem deploying the application. To work with these wrapped libraries, the application seems to access a specific dll, for instance, let's say the C assembly name is A.dll, it seems to be making attempts at invoking its wrapped version, Awrapped.dll. In the case of my application though, this invocation is producing a DLLNotFound exception. If the installer sets the environment variables, then the application is able to pick up the wrapped dlls. If, however, the path to these wrapped dlls is specified in the application configuration file as <probing privatePath = "..." />, the dlls are not found. I don't have the source code for these dlls. Initially, I had thought that if somehow I could get access to the source code, I would be able to strongly name the dlls and then wrap them. Perhaps that would have allowed me to use assembly binding policies to find the specific dlls. But now I think even that would not have helped. Is there a special method for deploying wrapped dlls? Could someone tell me if this problem is being cause because of the dlls being wrapped? Thanks Tag: Saving settings to custom configuration section in 2.0 Tag: 110790
  - 21
    - Finding and Creating Assemblies?!? fuslogvw I am trying to track down an annoying and deep-seated bug in a custom designer for a custom component. In the course of trying to figure out why certain errors are occuring I ran fuslogvw to see exactly what assemblies are being loaded when my application loads into VS2003. I was astonished to see that an assembly I no longer use/reference in the project gets loaded. I was even more astonished to see that the framework went back and re-created the directory structure of the project which used to create the "old" assembly, and plopped a copy of the old assembly into it. Why is this happening? How do I stop it? What do I do in the future to keep stale/old assemblies from being re-introduced to my projects? - Mark Tag: Saving settings to custom configuration section in 2.0 Tag: 110789
  - 22
    - AppDomain and PrivateBinPath Hi together, I have got a question according to AppDomains and their PrivateBinPath property. I am doing the following: ------> SNIP AppDomainSetup actSetup = new AppDomainSetup(); actSetup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory; actSetup.PrivateBinPath = @"Lib2;Lib1"; AppDomain firstLibDomain = AppDomain.CreateDomain(Guid.NewGuid().ToString(), null, actSetup); IClassLibrary actLib = firstLibDomain.CreateInstanceAndUnwrap("MyLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=397a36feab9afc6a", "ClassLibrary.Test") as IClassLibrary; --------< SNAP So everthing is fine. As you can see there are two subdirectories: Lib2 and Lib1 in the private bin path. Now when I have an assembly with the fully qualified name like: "MyLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=63f75bd8dc418e77", "ClassLibrary.Test" (the only difference is the public key token) in the Lib2 subdirectory and "MyLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=397a36feab9afc6a", "ClassLibrary.Test" in the Lib1 subdirectory. I get the following error in the fusion log. WRN: Comparing the assembly name resulted in the mismatch: PUBLIC KEY TOKEN ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated. Which means that he finds the assembly name, but the public key token doesn't match. So the loading mechnism stops here instead of looking in the other subfolder Lib2 where the matching assembly would be. If I put both assemblies in the GAC I didn't have any problems. So I am wondering, I thought that I could get this running with AppDomain too? Any ideas what's wrong here???? Cheers, Franz Tag: Saving settings to custom configuration section in 2.0 Tag: 110785
  - 23
    - How do C# delegates in .NET work under the hood? C# Delegates And Events in Depth After a couple of years of programming in .NET I finally took time to investigate in detail how exactly C# delegates and events work under the hood. Topics covered in this article include: Class Delegate. Class MulticastDelegate. Field-like events. Event accessors. Virtual events. Delegate Class Every delegate object in your code is implicitly derived from class Delegate. This class is special in a sense that only system and compilers and create types derived from it. C# and VB.NET programmers cannot derive explicitly from Delegate. I am not sure whether this limitation holds for programs written directly in IL (will verify it some day). Delegate class has two main properties - Target and Method.Target references an object instance, and Method describes a method implemented by that instance. To invoke a delegate means to take Target object and call its method described in Method. For example: delegate void MyDelegate(); class MyClass { public void SomeMethod() {...} } ... MyClass myClass = new MyClass(); MyDelegate d = new MyDelegate( myClass.SomeMethod ); // now d.Target is myClass, and d.Method describes MyClass.SomeMethod Note that Delegate represents a unicast delegate, which referes to a single method. Delegates and Static Methods What is the Target of a delegate which points to a static method? For the outside world, Target property of such a delegate returns null. But this is not the whole story. Internally delegate stores its target in a private field named _target. Normally, public property Target just returns a value of _target. Not so for static delegates. For static delegates, _target contains a reference to the delegate itself. "Get" accessor of Target makes a quick check, and if _target references a delegate, returns null. I am not sure what are the reasons for this balancing act. Equality of Delegates Non-static delegates are equal if their targets are the same (i.e. are ReferebceEqual()), and their Methods point to the same method (i.e. are Equal()). This means that delegates can be considered equal even if they belong to different delegate types. For instance, example below prints "Delegate equality: delegates are equal". public class DelegateEquality { delegate void DelegateTypeA(); delegate void DelegateTypeB(); private void TestMethod() {} public void DoTest() { DelegateTypeA a = new DelegateTypeA(this.TestMethod); DelegateTypeB b = new DelegateTypeB(this.TestMethod); bool areEqual = Object.Equals(a,b); if (areEqual) { Console.WriteLine("Delegate equality: delegates are equal"); } else { Console.WriteLine("Delegate equality: delegates are not equal"); } } } Static delegates are equal if their Methods point to the same method. MulticastDelegate Class Class MulticastDelegate derives from Delegate and represents a delegate that can invoke more than one method at once. All delegates that you create in C# are multicast delegates. Internally, MulticastDelegate is implemented as a linked list of delegates. Delegates are stored in the list in the reversed order of execution. I.e. if we execute the following code: Class1 object1 = new Class1(); Class2 object2 = new Class2(); MyDelegate d = new MyDelegate(object1.Method1); d += new MyDelegate(object2.Method2); delegate d is represented in memory as follows: This representation is convenient, because additions and removals are usually done in the end of the list. Invoking the delegate is implemented via recursion: invokaction code first invokes Previous delegate (which recursively invokes the whone chain), and that calls Target.Method. Note that due to this representation Target and Method properties of a multicast delegate always return Target and Method of the delegate most recently added to the list. Adding and Removing Delegates All delegate types declared in C# have implicit operators += and -=. Adding a delegate to a multicast is straightforward: a+=b appends b to the invocation list of a. Removing delegates is based on equality. a-=b removes last occurence (in execution order) of a delegate equal to b from the invocation list of a. If invocation list of a becomes empty, a becomes null. Removal by equality allows us to get away with code like this: MyDelegate a = null; a += new MyDelegate(object1.Method1); a -= new MyDelegate(object1.Method1); Delegates passed to += and -= are not the same, but they are equal. Since removal is based on logical equality, and not reference equality, it works fine in this case and a becomes null as we expect it to. Null Delegates There is no such thing as delegate without an invocation list. Whenever invocation list becomes empty, delegate becomes null. Calling null delegate is a run-time error. Therefore, whenever someone calls a delegate, he/she must check it for null, or else. MyDelegate a; ... if (a != null) { a( parameters ); } I am not sure why Microsoft decided not to make this check automatic. After all, calling a delegate without the check rarely makes sense. A situation when we can absolutely guarantee that the delegate is not null, and when we do really worry about extra couple of cycles spent on the check, seems to occur pretty rarely. If really necessary, for the situation like this a special way to do "nocheck" calls could be provided, but checked call should be the default. Unfortunately, it isn't. Events When I started programming in C#, it took me certain effort to understand the difference between events and delegates in .NET. C# syntax makes them to look deceptively similar: MyDelegate a; // delegate event MyDelegate b; // event Don't let the syntax fool you. Conceptually, event is a pair of methods: add accessor and remove accessor. Each method takes a single parameter of specific delegate type. Add accessor is invoked via "e+=d" expression, remove accessor is invoked via "e-=d" expression. Event accessors can be explicitly declared as follows: class MyClass { public event MyDelegate GoodNews { add { // add accessor code here } remove { // remove accessor code here } } } After seeing full event declaration syntax, it becomes clear that events are more similar to properties than to delegates. Unlike property, event cannot have just one accessor - it must always have both. Note that event does not provide a "call" or "raise" accessor. This is because entities outside declaring class are not supposed to raise the event. In other words, raising is not part of event's public interface - it is an implementation detail. Using Events Users of event register their delegates using operator += and remove them using operator -=. This is all they can do with the event. Class that implements the event is supposed to invoke registered delegates at specified moments, e.g. when mouse button is down, or when socket data arrives, etc. However, what and when to invoke is entirely up to the author of the class. In particular, there is no guarantee that the class will invoke all the delegates that have been registered. Theoretically, the class can ignore every other delegate, or call only delegates whose target is derived from MarshalByRefObject. Of course, although theoretically possible, in reality such picky classes either don't exist, or are a negligible minority. Implementing Events Most typical implementation of an event would be as follows: class MyClass { public event MyDelegate GoodNews { add { lock(this) { _goodNews += value; } } remove { lock(this) { _goodNews -= value; } } } private void OnGoodNews() { if (_goodNews != null) { _goodNews(); } } private MyDelegate _goodNews; } Figure 1 Here we use private delegate _goodNews to store invocation list for the event. This is not the only possible implementation, however. Let's consider a situation when our class defines lots of events, and typically only a couple of events is actually hooked up for a particular instance of the class. In this case, storing lots of private delegates would be a great waste of space. Each instance of the class would carry all the delegates, and only a few of them would be actually used. The solution is to hold in each instance a container that stores only actually used delegates. This is exactly how event-rich UI classes like Control handle their events. Field-Like Events Implementation of an event outlined in Figure 1 is by far more common than any other. In fact, it is so common that authors of C# language added a special syntactic shortcut for it. If a class declares a non-abstract event without add and remove accessors, compiler automatically generates default accessors similar to those in Figure 1, and adds an anonymous private delegate field that stores invocation list for the event. Such "default" events are called "field-like events". See section 10.7.1 of C# Language Specification. In addition, when name of field-like event is used inside the class it refers not to the event itself, but to the anonymous private delegate created by compiler. class MyClass { public event MyDelegate GoodNews; private void OnGoodNews() { if (GoodNews != null) { GoodNews(); } } } Figure 2 Code in Figure 2 is functionally equivalent to code in Figure 1 . Note, that anonymous delegate is private, and therefore not accessible anywhere, but in the class that declares the event. In particular, the following code does not compile, because derived class does not have access to the anonymous delegate: class MyClass { public event MyDelegate GoodNews; } class Derived : MyClass { private void OnGoodNews() { if (GoodNews != null) // bad! { GoodNews(); // bad! } } } Also, if event is not field like, there is no anonymous delegate that backs it up, and the only things anybody (declaring class included) can do with it are += and -=. For instance, the follownig will not compile: class MyClass { public event MyDelegate GoodNews { add { ... } remove { ... } } private void OnGoodNews() { if (GoodNews != null) // bad! { GoodNews(); // bad! } } } Virtual Events If event is declared with the keyword virtual it makes its acessors virtual. Field-like events can also be virtual. Derived classes can override accessor methods with their own implementation. E.g. class MyClass { public virtual event MyDelegate GoodNews; // field-like private void OnGoodNews() { if (GoodNews != null) { GoodNews(); } } } class Derived : MyClass { public override event MyDelegate GoodNews { add { Console.WriteLine("Adding delegate to GoodNews event"); base.GoodNews += value; } remove { Console.WriteLine("Removing delegate from GoodNews event"); base.GoodNews -= value; } } } Event can also be abstract. It means that add and remove accessors are abstract and derived classes must provide their own implementation. Virtual Events Gotchas If derived class provides its own implementation of add and remove accessors, which puts event invocation list in its own storage, base class has no knowledge of how to invoke the event. Consider the following code: class MyClass { public virtual event MyDelegate GoodNews; // field-like private void OnGoodNews() { if (GoodNews != null) { GoodNews(); } } } class Derived : MyClass { public override event MyDelegate GoodNews { add { lock(this) { _goodNews += value; } } remove { lock(this) { _goodNews -= value; } } } private delegate MyDelegate _goodNews; } Whenever base class invokes the event, it will call only delegates stored in Base.GoodNews. However, GoodNews+=d and GoodNews-=d will oeprate on Derived._goodNews, of which base class has no knowledge. This is resolved by making function OnGoodNews protected and virtual. If derived class overrides event accessors, it must also override the function that invokes the event. Summary All C# delegates implicitly derive from class MulticastDelegate, which is a linked list of target/method pairs. Delegates are compared by logical equality, not by reference equality. Event is nothing more than a pair of methods. As such, it can be made part of an interface, virtual, abstract, et cetera. "Raise" operation is not part of event behavior. Field-like event is a syntactic shortcut that implements event based on a private anonymous delegate. Delegates and events are important mechanisms of C# language. Hopefully this article helped to eliminate confusion by demonstrating how things work under the hood. (http://ikriv.com:8765/en/prog/info/dotnet/Delegates.html) Tag: Saving settings to custom configuration section in 2.0 Tag: 110783
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    - stackFrame.GetFileLineNumber returns 0 Hi, I'm trying to get the current Line Number from the Stack with stackFrame.GetFileLineNumber, how ever the method return 0. What's my error? Thanks in advance for any advice Anthony -- Anthony Malt Tag: Saving settings to custom configuration section in 2.0 Tag: 110779
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    - Shortcut Validation on Install time... Is there a way to place a desktop shortcut after install on the user desktop, only if the user wants it (i.e. checkboxed through the install UI)? I have tried User's Desktop Conditions but they do not seem to work properly... Is there any solution for this? Any type of help will be highly appreciated. Thankyou. Tag: Saving settings to custom configuration section in 2.0 Tag: 110777

Hi, I am looking for a way to save settings to a custom section in app.config
from a C# application. I am using .NET 2.0.

The following is a snippet of the app.config

<configuration>
<configSections>
<sectionGroup name="GroupA">
<section name="Section1"
type="System.Configuration.NameValueSectionHandler"/>
</sectionGroup>
</configSections>
<GroupA>
<Section1>
<add key="item1" value="value1"/>
<add key="item2" value="value2"/>
</Section1>
</GroupA>
</configuration>

What is the simplest way to save settings for "GroupA\Section1\item1"?

TIA.

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