SynchronizationContext

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- Previous
  - 1
    - Windows Installer 3.1(v2) error When attempting to uninstall Microsoft .NET framework version 1.1, I get these errors: (Application popup, event id 26) Microsoft Visual C++ Runtime Library Runtime Error Program C:\Windows\System32\msiexec.exe This application has requested the runtime to terminate in an unusual way. Please contact the application support team for more information. After a long pause, the second error occurs: The Windows Installer service could not be accessed. This can occur if you are running in safe mode or if the Windows Installer is not correctly installed. I have uninstalled and reinstalled Windows Installer v 3.1 (v2) twice using both methods described in this article: http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q315346 I also tried uninstalling the WI and visiting Windows update where it automatically downloads and installs the installer. None of this has worked. I still get both errors. As I said, this started with trying to uninstall .NET framework1.1. I was following the method to unistall and reinstall, described in this article. (I skipped step 4 that required the Msizap utility included in the windows installer SDK utility) (Did not try the repair method listed here) http://support.microsoft.com/default.aspx?scid=kb;en-us;824643 The reason for uninstalling .NET framework1.1 is that a critical security update (KB886903) will not install. Tried countless times even after sucessfully uninstalling/reinstalling .NET1.1. Have .NET 1.0, 1.1 and 2.0 installed Tag: SynchronizationContext Tag: 108706
  - 2
    - remoting configuration STA I am trying to create a remote object that instantiates an ActiveX control. Apparently ActiveX controls can only be created in STAThreads. When I make the following call from the client: _myRemoteObject = (IRemoteObject) Activator.GetObject( typeof(MyLib.IRemoteObject), host ); I keep getting the following error: {"Could not instantiate ActiveX control 'd5b7f60a-c223-4556-845d-fe5f59e49f03' because the current thread is not in a single-threaded apartment." } I did some searching on the error and people seem to recommend starting threads as STAThreads. But both my server and client were started as STAThread. Something is happening when I make the GetObject() call. When I step into the constructor for my remote object it says that I am in a MTA thread. Does anyone know what I am doing wrong? Is there something that I can put into my remoting configuration file to specify that the remote object should be created in an STAThread? -Corey ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- Tag: SynchronizationContext Tag: 108697
  - 3
    - .NET programs memory consumption I noticed that my windows application, very simple test written in C#, keeps and keeps allocating memory. For example, when at the start it has allocated 7500kB, after few minutes, memory allocation is 12000kB. Even if i don't click any buttons or so. And when i start clicking a button, with no event handling, it allocated 40k more memory on every click. Is this normal? Why program needs extra memory after a dummie button click? I'm using .NET 2.0 and Visual C# Express, on WinXP Home with AMD64. Memory figures are taken from task manager. Tag: SynchronizationContext Tag: 108696
  - 4
    - Free components Hi who can advice me a good web site with free .NET components, it will be great if there will be cources also Thank you. Tag: SynchronizationContext Tag: 108688
  - 5
    - User controls Hi I am writing (practicing) a small game using user controls and some time my control whould become over another same type or another type user or windows control how can I modify the layout , some thing like Z coordinating in my controls??? Thank you Tag: SynchronizationContext Tag: 108687
  - 6
    - strong-name - framework 1.1 and framework 2.0 Hi guys, I have an application that is a asp.net and uses some dlls. This dlls are signed with a strong-name key. When I sign a dll using framework 1.1 and a file.snk I get a key XXX. And when I sign dll using framwork 2.0 and the same file.snk I get a key ZZZ. (command to get a key from dll: sn -T file.dll) Why does it happen ? Should I not see the same key ? TIA, wrampazo. Tag: SynchronizationContext Tag: 108686
  - 7
    - How to find a block in Finalize()? Hello, I'm using .NET Framework 1.1, C#. A couple of days before I've found out that my application leaks memory not releasing objects with destructors. I'm using some third-party components (Spring.NET and Oracle Data Provider .NET (ODP.NET is actually a leak in my case)). I know that it's a good habit to call Dispose() if the object is IDisposable, but in my case I cannot do this, and need to rely on destructor (performance loss was considered). Then I've tried to reproduce the problem in a small test project (with only ODP.NET objects) and failed :(. The leak was away. Now I suspect that Spring.NET/ODP.NET somehow blocks the finalizer thread, so that it never clears the garbage left. Justification: /// <summary> /// Create a new session /// </summary> /// <returns>The new session that can be used by the client.</returns> public ISession CreateSession() { GC.Collect(); GC.WaitForPendingFinalizers(); //Application hangs here GC.Collect(); GC.WaitForPendingFinalizers(); new Message(Message.MessageType.CalledCreateSessionOn0, this.GetType().FullName).LogDebug(); ISession session = (ISession) Application.CreateSession()[typeof(ISession).FullName+".Remote"]; return session; } This method will be called relatively early after the client starts (server and client interact over normal MarshalByRef objects, there is anyway not much interaction there...). It is practically the first client call on the server side. Before the first client starts there will be some Spring.NET initialization done and an OracleConnection opened and closed (to check that the database is available). The problem is that this code hangs on the first call to GC.WaitForPendingFinalizers(). By "hangs" I mean that nothing else will be done in application - no log messages, in Visual Studio I can pause/stop application (shows me a Console.ReadLine(); line - is not relevant). I've been waiting for 15 minutes - no changes. The memory leak was found out by ANTS Profiler and is definitely there. :( I've also installed WinDBG in order to find out where the finalizing thread is blocked, but had not much advance on that field (starting from that I do not know which of threads is finalizing thread). I have source code for Spring.NET, but it is really huge and not quite understandable. I would be happy if I'll find out that the problem is really in Spring. Can anyone help me, please? Do I actually force the garbage collector in a correct manner (Collect/WaitForFinalizers, Collect/WaitForFinalizers)? How can I find out what the finalizing thread is actually doing? Does the observed behaviour (hang on WaitForPendingFinalizers) actually an evidence that there are problems in finalizer? Thank you in advance. Tag: SynchronizationContext Tag: 108685
  - 8
    - problem with special characters in password We have a case where users who are encouraged to have good passwords with norwegian characters and other special characters cannot login to a ASP.NET 1.0 app. This problem is discussed in the following article from MSKB: http://www.kbalertz.com/kb_835388.aspx Do you know if this problem is fixed in later versions of the framework? I.e. servicepacks, 1.1 or 2.0. Thanks. -- _________________ Rolf @ Questus ans Tag: SynchronizationContext Tag: 108684
  - 9
    - Exception from dialog not catched on Windows x64 box? Hello. I've installed VS 2003 on my Windows XP x64 box. And catched the problem: if exception is thrown from some window ShowDialog it is not catched by catch followed by ShowDialog. Somewhere in the VisibleChanged dialog form handler exception is thrown. private void Dialog_VisibleChanged(object sender, System.EventArgs e) { if (Visible == false) throw new ApplicationException("test exception from dialog"); } On Windows XP x32 box it is catched after dialog is displayed. try { using (Dialog d = new Dialog()) { d.ShowDialog(); } } catch(Exception ex) { MessageBox.Show(string.Format("exception catched\r\n{0}", ex.Message)); } When code is build on Windows XP x64 exception is not catched :( How it could be possible? Compleete test could be downloaded from <http://spot9969.multiply.com/video/item/1> (11KB, VS 2003) Tag: SynchronizationContext Tag: 108683
  - 10
    - Detect the encoding of a stream Hi, Is there a way in which I can detect the encoding used while creating a StreamReader? I have a method which receives a StreamReader as a parameter. I want to ensure that when I do a StreamReader.BaseStream.Seek() , I give the appropriate offset so that encoding information/byte order marks are not read in (In case the file uses UTF8 or Unicode encoding). Is there a standard way to do that? Thanks, Roshan Tag: SynchronizationContext Tag: 108678
  - 11
    - Free tool to compress and pack .NET assemblies (embed DLLs is single EXE ) .NETZ is a free open source tool to compress .NET EXE and DLL files, writen in C#. It can also pack the DLL files with the EXE, creating a single EXE file: http://madebits.com/netz/index.php Tag: SynchronizationContext Tag: 108676
  - 12
    - CPU load of process started from .Net Process class is low Hello, is here anybody who can tell me why process started with Process class has less CPU time that same process started from command line? Most strange thing is that when I use Process class to start batch file, which starts that process, it works faster. BR Tag: SynchronizationContext Tag: 108674
  - 13
    - Smart Client Problem Hi, I have developed C# Windows application. I thought of deploying this application in the webserver and access the application like SmartCLient model. I have given IIS permissions. I have written small application which will access the main application using URL. I am gettin the login screen of the main application, entered the user name and password, clicked on teh OK, when i click on OK, it will check the app.config file and will connect to the database and will get the MDI screen to Client PC. Here i am getting the Exception. I am unable to catch this exception also. WHen i write MessageBox.Show, it is not displaying the exception, please help me in this. Thanks in advance Satish Tag: SynchronizationContext Tag: 108673
  - 14
    - Using TcpClient with Modem Hi everybody, I am still learning how sockets, TcpClient and TcpListener work, in order that both sides to send and receive data, both sides must have a socket or TcpListener and a TcpListener right? Is there a possible way to say just have a client side TcpClient application to send a message to remote server like sending a text file? Do TcpClient requires a Internet connection to connect say to remote server? So, to connect to a VPN network(remote server), I need to establish internet connection like using RAS. Right? How do you programatically create connection using a local USB port with a GPRS modem? Using Sockets or TCPClient will be enough to do that? Please provide me with info on these questions. Is there anybody knows how to do this? Thanks. den2005 -- MCP Year 2005, Philippines Tag: SynchronizationContext Tag: 108671
  - 15
    - MSN chat integration i dont want to have my own chat application but instead integrate msn chat with my application, are there any API exposed for it??? Tag: SynchronizationContext Tag: 108668
  - 16
    - Why Assembly.LoadWithPartialName is obsolete? Hello, Does anybody know why the "Assembly.LoadWithPartialName" is obsolete? It seems that the Load method does not have an equivalent replacement for it. -- Best Regards, W. Jordan Tag: SynchronizationContext Tag: 108659
  - 17
    - framework for linux???? Hi all, Is there a framework for linux? Is it possible to run a .net application on a linux platform? thank you very much mi... Tag: SynchronizationContext Tag: 108655
  - 18
    - testing a program is running I'm writing my installer which, of course, is a win32 app (no .NET) I would like to test tthe program is already running (in case of reinstall/upgrade) and prompt the user to stop the application. How do I do that? Basically I would like somthing like Process.GetProcessByName() but with win32 calls. Any idea? Tag: SynchronizationContext Tag: 108654
  - 19
    - WaitCursor / hourglass in custom printpreview dialog Hi, I have created a simple custom PrintPreviewDialog consisting of a simple standard PrintPreviewControl (.NET 1.1) on a WindowsForm with a few buttons (for printing, zooming, etc.). It is working fine, except for that I cannot figure out how display the waitcursor / hourglass while the preview is preparing to show the document *and then go back to the default cursor when the document is displayed*. Turning on the waitcursor is easy, but what event should I hook into to turn it off?? What happens when I preview a document that is about 50 pages long is that you get the blank form on the screen and then nothing happens for maybe 40 seconds and then you get a "Generating Preview" message and then the document is displayed. It is during the initial 40 seconds that I need an hourglass or something to let the users know that something is happening in the background. Here are some snippets of what I am doing currently: // Constructor: public PreviewDialog(System.Drawing.Printing.PrintDocument printDocument, int zoom) { InitializeComponent(); _printDocument = printDocument; _zoom = zoom; } private void PreviewDialog_Load(object sender, System.EventArgs e) { this.Cursor = Cursors.WaitCursor; Initialize(); //this.Cursor = Cursors.Default; // This gets hit instantly, so you never see an hourglass. } private void Initialize() { uxPrintPreview.Anchor = AnchorStyles.Bottom | AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right; uxPrintPreview.Zoom = zoom; this.WindowState = FormWindowState.Maximized; uxPrintPreview.Document = printDocument1 = printDocument; } // The calling code: using (PreviewDialog form = new PreviewDialog(c1Report1.Document)) { form.ShowDialog(this); } If there was an event like LastPageFinished or DocumentRendered or similar in the PrintPreviewControl, I would be home free, but I cannot find anything like that. Any help on this would be greatly appreciated. Thanks, Lars Tag: SynchronizationContext Tag: 108648
  - 20
    - Work Flow Hi All, Is there any open source code available for workflow engine in C#, VB .Net framework. Regards - Atul Sureka Tag: SynchronizationContext Tag: 108647
  - 21
    - How to store objects created with C# in database in .NET Framework I want to store the objects that i create in run time in database. In a way that, for a product a create an object from a class written with C#, define its properties and functions that it has, and want to store it in a database (SQL Server 2K). I want the columns to be created and filled dynamically when an object is inserted in db (Just like in J2EE, which is called i think relational mapping, or something like this). How can I do that? Tag: SynchronizationContext Tag: 108641
  - 22
    - How to store C# objects in DB I want to store objects that i create programmatically in C#, like in J2EE (which is callad i think relational mapping or sometihng like this). I want to create objects that i use for my enterprise applications and store them in database after execution. And I want the columns and rows related to my objects to be created and filled automatically. How can i do that. Thanks? Tag: SynchronizationContext Tag: 108640
  - 23
    - executable digital signature how do i add to my executable assembly (created using VB.NET / C#) a digital signature? Tag: SynchronizationContext Tag: 108638
  - 24
    - .NET Remoting to COM Hello, I have a .NET application where I want to be able to access COM objects on a remote server (theses objects are the base for a web appliation we are running). I've been looking on the net for an easy example, or at the very least some documentation that would make tell me how to do it (if at all possible). So if anyone has any idea on how this could (or coudn't) be done, or any cue on where to look and for what, I would strongly appreciate. Many thank's in advance. Eric Tag: SynchronizationContext Tag: 108637
  - 25
    - installed 2.0.50727 now I get a sql express error message I now get the following error message after copying an asp.net application to the deployment web server. I don't have SQLExpress or any version of SQL 2005 installed. I found the "LocalSQLServer" connection string in the machine.config, changed that to look at a SQL 2000 database, but the error still comes up. An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)] System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734995 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188 System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820 System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628 System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170 System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28 System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66 System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105 System.Data.SqlClient.SqlConnection.Open() +111 System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121 System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162 System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +107 TIA, Dave Tag: SynchronizationContext Tag: 108636
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  - 1
    - mscorsvw x64 OS freeze When Idle Hello, I am running XP64 SP 1. I had VS2003 installed. When I tried to install VS2005 professional my machine froze on the framework 2.0 install. I rebooted and tried again. Same thing. I disabled my Antivirus and tried again. Froze on the same spot. I uninstalled VS2003 and framework 1.1, disabled my Antivirus and tried to install framework 2.0 from the MS update website. The system froze. Once rebooted, "Add or Remove Programs" showed that the install was complete. I rebooted, disabled my Antivirus and then tried to install VS 2005. It worked. Unfortunately every time I leave my system idle for 5 to 10 minutes it freezes up again. I opened my task manager and let it idle and every time it freezes mscorsvw.exe is on the top of the CPU order. I did some research and found this article. http://blogs.msdn.com/davidnotario/archive/2005/04/27/412838.aspx I tried the: ngen.exe executequeueditems It ran, reported some errors that I missed durning the scroll by and then locked up. I have tried it again and it locks up each time at: Executing C:\windows\microsoft.net\framework\v2.0.0.0,culture=neutral,publictoken=b77a5c561934eo8911 /nodependencies /nologo Least that the way I read my bad hand writing. Any ideas on how to fix it? Thanks in advance Mark Tag: SynchronizationContext Tag: 108634
  - 2
    - upgrading to .NET 2.0 woes hello , I'm upgrading c++ files in which the source is available that has a managed wrapper to a non-managed dll. It was .NET 1.1 now I want .NET 2.0 I made some changes and I now get some warnings when compiling. I get no errors. Running this dll from my C# app returns the following exception: {"Strong name validation failed. (Exception from HRESULT: 0x8013141A)"} referring to the data: {System.Collections.ListDictionaryInternal} Now as far as I know .NET 2.0 does not contain "System.Collections.ListDictionaryInternal". I'de like to fix my c++ file to point to the new "System.Collections.Specialized.ListDictionary" but I can't even find where it is trying to do this :( Searching the project for "ListDictionary" did not return anything. Any hints? V. (c++ ultra-noob) Tag: SynchronizationContext Tag: 108631
  - 3
    - assembly name or one of its dependencies was not found Hey Everyone, I have run into a problem with asp.net I have a web page default.aspx that posts to itself. On post, I call a WebService to validate uername and password. In the catch block of the WebSerive call, I am getting the attached error. I have been researching this error for about two days and have tried adding the ASP.NET and NETWORK SERVICE users to the administrator group with full permissions over C:\WINDOWS and it's children as most of the research I did pointed to that issue. I have also installed the XMLPrecompiler solution to see if there are any issues with serialization, but everything checks out fin there as well. Lastly, I verified that I was running .NET 1.1.X as some research said that may be an issue as well. I would appreicate any help or any suggestions. -MW ERROR TEXT: at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at CUSTOM METHOD DECLARATION System.Web.Services.Protocols.SoapException: Server was unable to process request. --> File or assembly name oaayvpwc.dll, or one of its dependencies, was not found. at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) CUSTOM METHOD DECLARATION Server was unable to process request. --> File or assembly name oaayvpwc.dll, or one of its dependencies, was not found. Tag: SynchronizationContext Tag: 108630
  - 4
    - Refreshing TreeView after Editing a Label Here's the problem. I have a TreeView that is essentially a listing of directories and files. If you right-click on a directory then a context menu comes up and one of the options is "New Folder", when the user clicks that it expands the current node, creates and add's a child node, then calls BeginEdit() on the child node. I have written a custom class that implements IComparer to sort on rules that I have defined. The problem comes in the fact that BeginEdit() appears to be an async call, and as far as I can tell, there's no event that gets fired to let me know when it is done so that I can then call Sort() on the TreeView. There is an 'AfterLabelEdit' event on the TreeView, but it appears that the actual label on the node isn't changed until after that event is finished firing. I've tried manually setting the text of the node in an event handler for that event, but it causes the TreeView to do wierd things (like the node is still editable after I finished editing it, and if this is the second or so folder I've created, the previous one I create is being reassigned the same name as the one I created. If anyone can help me, I'd appreciate it. Code: ================================================ private void contextMenuFolder_Click(object sender, EventArgs e) { TreeNode newFolder = new TreeNode("", FOLDER_CLOSED, FOLDER_OPEN); tvwReports.SelectedNode.Nodes.Add(newFolder); tvwReports.SelectedNode.Expand(); CatalogItem item = new CatalogItem(); item.Type = ItemTypeEnum.Folder; newFolder.Tag = item; newFolder.BeginEdit(); } private void tvwReports_BeforeLabelEdit(object sender, NodeLabelEditEventArgs e) { if (e.Node.Tag != null) { if ((e.Node.Tag as CatalogItem).Type != ItemTypeEnum.Folder) e.CancelEdit = true; else e.CancelEdit = false; } else e.CancelEdit = true; } private void tvwReports_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) { this.Cursor = Cursors.WaitCursor; string fullPath = e.Node.FullPath.Substring(e.Node.FullPath.IndexOf('/')); if ((e.Node.Tag as CatalogItem).Name == null) { if (e.Label == null || e.Label == "") //this is a new folder and no name was given, delete the node e.Node.Remove(); else { //get path as relative to the webservice fullPath += e.Label; //new folder node, need to call webservice to add CatalogItemManagement.CatalogItemManager.AddFolder(fullPath); e.Node.Tag = CatalogItemManagement.CatalogItemManager.GetCatalogItem(fullPath); } } else if ((e.Node.Tag as CatalogItem).Name != e.Label) { if (e.Label == null || e.Label == "") //the label was left blank, set it back to what it was before e.CancelEdit = true; else { //node already existed, but folder name has changed, need to update CatalogItemManagement.CatalogItemManager.MoveCatalogItem(fullPath, fullPath.Replace(e.Node.Text, e.Label)); } } this.Cursor = Cursors.Default; } ================================================ I am using Visual Studio 2005 (with .NET 2.0, of course) Tag: SynchronizationContext Tag: 108620
  - 5
    - Nullable<int>, implementing GetHashCode, and thread safety The VS2005 documentation for Object.GetHashCode has three notes to implementors: *blockquote* If two objects of the same type represent the same value, the hash function must return the same constant value for either object. For the best performance, a hash function must generate a random distribution for all input. The hash function must return exactly the same value regardless of any changes that are made to the object. */blockquote* So in a reference type that isn't immutable satisfying the third requirement seems to require caching the hash code the first time it's queried for. This seems like a good place for Nullable<int>. However, if there's a competing requirement for the reference type to be thread-safe, the cached hash code needs to be initially assigned in a thread safe manner. To avoid the thread safety problems with double checked locking, there will be a locking cost associated with initially creating and caching the hash code. To minimize the cost, and since the hash code will be int-sized, it'd be nice to take advantage of the System.Threading.Interlocked class's methods. Hmm, but Interlocked.CompareExchange can't handle the following: Nullable<int> alpha = null; int value = 1; Interlocked.CompareExchange(alpha,value,null); Rats. The nullable type would have seemed cleaner, but boxing an int into an object (below) still works. Is this the best way to go? How bad would the overhead of locking a private instance field and using a nullable type be by comparison? Is there something obvious with Nullable<int> that I'm missing that would support this? Should Interlocked get overrides to handle Nullable<T>? Could such overrides avoid the same overhead that locking a private instance field would face? class Triple<T1, T2, T3> { private Object hashCode; private T1 first; private T2 second; private T3 third; //... public override int GetHashCode(){ if (this.hashCode == null){ int firstHash = (!Object.ReferenceEquals(this.first,null)) ? this.first.GetHashCode() : 0; int secondHash = (!Object.ReferenceEquals(this.second,null)) ? this.second.GetHashCode() : 0; int thirdHash = (!Object.ReferenceEquals(this.third,null)) ? this.third.GetHashCode() : 0; Interlocked.CompareExchange(ref this.hashCode, (Object)(firstHash ^ secondHash ^ thirdHash), null); } return (int) this.hashCode; } //... } Tag: SynchronizationContext Tag: 108617
  - 6
    - Embed windows media player and possibly others in .net app? I have a list of media files to choose from in the app. Right now clicking on it will launch it using System.Diagnostics.Process.Start to launch whatever appropriate application for that particular file. Since I know the extension of the file, can I embed media player in the app instead of having media player popped up and run separately, just like embedding the media player in the web page with certain functionality show? Tag: SynchronizationContext Tag: 108615
  - 7
    - How to add right click menu Tool: Visual Studio 2005 I have a custom photo library application previously written in VS 6. Basically it has 1) DriveListBox, DirListBox, FileListBox, all listed as Microsof.VisualBasic.Compatibility.xxx 2) PictureBox inside a Panel (for auto showing scroll bars when photo exceeds viewable area). 3) Buttons under FileListBox to Rename, Delete, etc file. I'm thinking there must be something equivalent to Explorer that allows you to single click to rename, right click with a bunch of options (Rename, Delete, Cut, Paste, etc) that I can replace the FileListBox with. If not, then I'd like to make it so that right click on a selected file would prompt a context menu with a few basic options. Thanks. Tag: SynchronizationContext Tag: 108608
  - 8
    - setting envrionment variable in C# and access it within native C++ We are having difficulties getting environment variable within native DLL written in C++ which is loaded by C# .NET assembly, the env var is set by the .NET assembly. We have an existing C++ application, and want to access it within C#. So we wrote Managed C++ wrapper which access the native C++ DLL. The Managed C++ wrapper is compiled as .NET assembly that C# can access. The native C++ DLL need to have an environment variable set to work properly. So within the C#, we use: [DllImport("Kernel32.dll")] public static extern int SetEnvironmentVariable( string name , string value ); to set the env var. But within the native C++ DLL, it will fail when trying to do "getenv()", with error: Object reference not set to an instance of an object. 1. If we make the C# application as console application and set env var in the console before start the C# application, it works. But we can't make the C# app a console app. 2. If we execute within the C# application a .bat file which prints out the env var, it shows that the env var is set. Looks that the native C++ DLL can't getenv() on the env var set within the C# app. Any solutions for this? Thanks a lot. Tag: SynchronizationContext Tag: 108605
  - 9
    - programmatic to ftp virtual directories programmatic to ftp virtual directories when i connect to an ftp server and i only have access to a few of the ftp virtual directories, do i just change directory to them after connecting and having credentials authorized? is there some special protocol for changing directories to authorized virtiual directories? Tag: SynchronizationContext Tag: 108604
  - 10
    - programmatic to ftp virtual directories programmatic to ftp virtual directories when i connect to an ftp server and i only have access to a few of the ftp virtual directories, do i just change directory to them after connecting and having credentials authorized? is there some special protocol for changing directories to authorized virtiual directories? Tag: SynchronizationContext Tag: 108603
  - 11
    - ASP Windows Service or Console based application Hi all, I am confused as to what kind of application to develop. I have to create an application thats like a "Engine" which continously monitors a DB or whatever. It has to work even if the user logoff as this engine feeds some other application. I tried creating a Windows service that runs continously but the status shows "Starting" and i cant "Stop" or "Pause" and was suggested by one BravesCharm that "Status does not change as the service never notifies the SCM that everything started OK" which makes sense. Is there a way for windows service to start some other application? is yes then how can i stop it from this windows service? Please do give me suggestions on how to achieve this. Thanks, Stephen Tag: SynchronizationContext Tag: 108601
  - 12
    - Clickonce install from CD Hi, I generated the deployment files into a local directory with specified installation URL. My prolbems: - If there is an internet connection on the client machine, it skips the files on the local hard drive, immediately start downloading from the web. - if there is no internet connection, the setup.exe fails (which is the startup program from a CD), but the application icon installs the software well. I implemented a custom async update. When I call the CheckUpdateAsync method I have got an exception in the Application.ThreadException event, not in the AsyncCompleted event as the MSDN says (in the e.Error)... Why? Thanks. lelez ------------ Here it is the code: try { ApplicationDeployment dep = ApplicationDeployment.CurrentDeployment; dep.CheckForUpdateCompleted += checkHandler; dep.CheckForUpdateAsync(); } catch (System.Net.WebException) { // never runs! System.Windows.Forms.MessageBox.Show("There is no internet connection."); } catch (Exception ex) { xxxx.Common.Util.Logger.LogException(ex); } Here it is the handler: private static void dep_CheckCompleted(object sender, CheckForUpdateCompletedEventArgs e) { if (e.Error is System.Net.WebException) { System.Windows.Forms.MessageBox.Show("There is no internet connection."); return; } ApplicationDeployment dep = ApplicationDeployment.CurrentDeployment; dep.CheckForUpdateCompleted -= checkHandler; try { if (e.UpdateAvailable) { ContinueQuestionEventArgs ce = new ContinueQuestionEventArgs(e.AvailableVersion.ToString()); // Ask the user about continue... if (updateIsAvailable != null) updateIsAvailable(null, ce); if (ce.Continue) { dep.UpdateCompleted += updateHandler; dep.UpdateAsync(); } } } catch(InvalidOperationException ex) { xxxxx.Common.Util.Logger.LogException(ex); } } // dep_CheckCompleted... -- ----------------------------------- http://www.lelez.hu ICQ: 177465172 Tag: SynchronizationContext Tag: 108600
  - 13
    - Caching architecture question. I am thinking about using Caching application block in my web application, for the performance reasons. My ideal sitiuation would be if i could plug in the application block between my Persistence layer and database, so that objects are created from the cache and cost of CRUd operation can be avoided.... the problem each object is not having a unique key, and caching application block does not provides any typed cache functionality, for example if i store a product object wtih uid 1 and a customer object with uid 1 then it would overwrite the product object, Iam thinking about creating a multiple cache managers according to the type of object, and keep all those cache managers in a super cache... in that case would the scavenger clean up caches inside a cachemanager object ? any comments Tag: SynchronizationContext Tag: 108595
  - 14
    - Program for my scanner This is a long shot, but here goes... I have an HP scanner that came with some software I don't like at all. I would like to write my own dotnet program. What is required? I suppose I would need some sort of component (HP proprietary) to get started. Would HP make such a component accessible for us? What can I do? Thanks. Tag: SynchronizationContext Tag: 108593
  - 15
    - GDI leaks? Hello all, I've just found the issue that really scares me. It seems that ListView doesn't release some GDI objects. Here you are steps to reproduce the problem: 1. Run Task Manager 2. View->Select Columns 3. Check "GDI Objects", press OK 4. Run Visual Studio 2k3 5. Create new Window Forms application 6. Put into the form "ListView" and enter 5 items. 7. Run Application 8. Force application to refresh (e.g. move another window above this application) You will see that GDI objects increase really fast. The same situation with Add/Remove items, GDI objects still increas. I've noticed that I can increase it number even till 10k and after that application starts to glitch. It seems that the problem can be solved after: GC.Colelct(); But this is *really* bad solution which significant impacts to the performance of application. Any ideas? Thank you, John Tag: SynchronizationContext Tag: 108591
  - 16
    - Web Config and regular string literal I am trying to keep the body of an email message in the web.config, something like "We have received ..... blah.. blah.. \n Thank you, \n ... some whitty closing line". Anyway, when I read this it is always coming back as a verbatim string literal and the email contains the escape chars (\n). How can I make this a regular string literal so that the email body will recognize the escape characters? Thank you Tag: SynchronizationContext Tag: 108590
  - 17
    - RegionInfo.ThreeLetterISORegionName returns TwoLetterIsoCode for B Hi all, I need to get the ISO-3166 code for BOSNIA AND HERZEGOVINA. What I am trying is 1) RegionInfo ri = new RegionInfo(5146); ==> works fine and gets RegionInfo 2) ri.ThreeLetterISORegionName ==> Output "BA". Expected "BIH". But I only get "BA" - not "BIH". Any help greatly appreciated I have noticed that BA/BIH is not listed in http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemglobalizationregioninfoclasstopic.asp Might this be the problem? I have also read about synthetic cultures http://blogs.msdn.com/shawnste/archive/2005/12/06/500675.aspx But anyway, BIH is a valid code found in ISO-3166. Any ideas how to get it via RegionInfo? Thanks, DPOMT Tag: SynchronizationContext Tag: 108589
  - 18
    - Dynamically import fusion.dll I'd like to dynamically import methods from the fusion library (fusion.dll). However, if I just do a straight [DllImport(blah)], I can't guarantee that I get the .Net 2 runtime version. I've found that the unmanaged method LoadLibraryShim in mscoree.dll will return a module handle to the latest runtime version, the thing I can't figure out is how to then use this handle to invoke methods on the library from C#. Any hints gratefully received! Tag: SynchronizationContext Tag: 108588
  - 19
    - System.Threading.Timer & W2K3 problem Hi all, I've implemented a Windows service application with c# and .NET Framework 1.1. The service starts 10 timers of type System.Threading.Timer. The service runs as expected on Windows XP and 2000 Professional. On the Windows 2003 Server + SP1 (Intel Xeon) some of the timers stop firing after a short period of time. No exceptions are thrown and no deadlocks occur. Do you have any resolution? Thanks, Mircea Tag: SynchronizationContext Tag: 108581
  - 20
    - automatic Time conversion ? Hello all, I am writting a client application that asks a DataSet from a server (WebService) and displays it locally in a DataGridView. The DataSet has a DateTime column. The problem is that the server and the client work in different time zones, and somewhere in the client the time conversion is made (added / substracted 1 hour). So in my grid I see different hours. How can I stop that ? Basically, I need to ignore this diference, but I can't find a way. Please help. Tag: SynchronizationContext Tag: 108577
  - 21
    - Run exe on LAN machine Please tell me how i can run .exe file on a LAN machine. I have administrative permissions. I am using C#.NET Tag: SynchronizationContext Tag: 108571
  - 22
    - Hidden Attribute on file affects security? Hi --- I tried to write an application that uses a config file. When I set the Hidden attribute on the config file, I found that my application was no longer able to write (System.IO.File.WriteAllText as well as System.IO.File.StreamWriter), and also not able to delete (System.IO.File.Delete), the file. I get an access denied error. However my application can remove the Hidden attribute, after which writing and deleting work properly. Is this expected behavior? If so, can someone point me to the documentation that explains the relationship between hiddenness and file access? thanks, denise Tag: SynchronizationContext Tag: 108563
  - 23
    - Does Framework 2.0 trash COM for everyone else ? We are running Server 2003 for our critical server applications. We have been updating a number of core software pieces to VS2005 / Framework 2.0. This software is installed and pretty much working as it should. The PERPLEXING issue to me is that I have antique VB6 COM components that are failing after adding Framework 2.0 to this server. Usually when the component is done after a lengthy process, and is returning to the caller. The VB6 component seems to have completed successfully, but the exception "Object variable or With block variable not set" is being thrown to the calling script. I have a VB6 test application which invokes the same VB6 COM component, and it also fails with the same error, at this server. We are talking about software that has been in there doing its job for years. Wanting to see it fail first hand I ran the test application on a development computer, W2K, and it of course runs fine. Besides a few isolated and unrelated VS2005 applications of our own, the only thing new on this computer is Framework 2.0 redistributable installation. I have to be suspicious that this has some how trashed COM for others. Tag: SynchronizationContext Tag: 108557
  - 24
    - vs2003 and .Net 2 Hello, I have vs2003 installed in my computer, I want to try .Net 2, can I install .Net 2 and still be able to use vs2003 and .Net 1? Please advice Tag: SynchronizationContext Tag: 108551
  - 25
    - cookie problem Greetings... I need desperate help with my problem. I guess the solution is related in some way with the cookies getting lost in the authentication process working with some web servers. Appreciate any help you could provide. I've created an application that does the authentication process using forms. I've succeed to install it in a lot of web servers and it works perfect. But, and here is the problem, in some of the web servers this is what happens: Starting the application the user has to follow the authentication process. If the user fails to enter the password, the server communicates him that either the password or the user name is incorrect. At this point, the process works fine. The problem starts when the user follow the authentication process correctly (user name and password are correct), after this, the system fails to continue to the next page, the user is sent back to the authentication page (like he was trying to violate the security using the URL). This problem happens when a user is trying to do the authentication process in a client machine; it doesn't happen if the user is in the server machine. I've done some research and these are the results: As the application works fine in most of the servers I've installed it, it shouldn't be an application problem. As the application gives the user an answer when either the user name or the password is incorrect, the server is responding correctly. As the application works fine if the user is in the server machine, installation or database problems are discarded. I've been tracking the cookies and this is what happens: If the user is working directly on the server machine, the system creates the cookies and everything works fine. But, if the user is working on any client machine the cookie never arrives. The problem is not on the client machines as if I connect them to another server, the cookie is created and the application works fine. The user is redirected to the authentication page because the cookie gets lost (Again: The client machines works fine connected to other servers) and he loses his credentials. Searching through the web I've found that there is a problem with the server name when it has characters like "_", but this is not my case. I've tried names like: Server/MyApp/Authentication.aspx 192.168.1.100/MyApp/Authentication.aspx OtherName/MyApp/Authenticacion.aspx But none of them works. I hope I've been clear enough with my explanation. Thanks in advance for any help you can give me. PD: The application has been developed using C# in VS .NET. Tag: SynchronizationContext Tag: 108549

Hello

I am trying to raise events in another thread context.
I am using SynchronizationContext object.
It works fine as long as i am synchronizing any thread with the MAIN
PROCESS.
if i try to sync between two independant threads it fails.
somehow the SynchronizationContext.Current property is null.

Any ideas why?
Thanks

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