Anyone knows the C# Equivalent

Hello,

I am trying to convert a program from Microsoft VB.NET team:

http://blogs.msdn.com/vbteam/archive/2005/04/14/TableAdaptersAndObjects.aspx

I am having a hard time converting the following two sections. Anyone knows
the C# equivalent?


- oringial VB.NET code from VB Team:
Public Sub AcceptChanges()

For Each item As T In Me.Items

item.ObjectState = ObjectState.Unchanged

Next

DeletedRows.Clear()

End Sub

- my approach:
public void AcceptChanges()
{
foreach (T item in this.Items)
{
item.ObjectState = ObjectState.Unchanged;
}
DeletedRows.Clear();
}
- Visusal Studio error: 'T' does not contain a definition for 'ObjectState'

2. Original code from VB team:

Dim txScope As New System.Transactions.TransactionScope

Using txScope
...
end using

- my approach:

using txScope
{
...
}
- Visual Studio:

Syntax error, '(' expected

Best regards,

Alan L.

--
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sturnfie
Sat Feb 17 11:48:31 CST 2007

On Feb 17, 10:52 am, "alee via DotNetMonster.com" <u31808@uwe> wrote:
> - my approach:
> public void AcceptChanges()
> {
> foreach (T item in this.Items)
> {
> item.ObjectState = ObjectState.Unchanged;
> }
> DeletedRows.Clear();
> }
> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState'

What is your definition for "T"? I am assuming this article is using
it as a generic object, meaning you need to create it and what it is
supposed to be; in this case, give it a property of "ObjectState".
Read the article to figure out what the expectations of the object are
(namely, what it is supposed to be based on).


> - my approach:
>
> using txScope
> {
> ...
> }
> - Visual Studio:
>
> Syntax error, '(' expected
>

This is an issue of scope. The proper syntax is:

using (txScope)
{
....
}


--
lucas

guffa
Sat Feb 17 11:48:35 CST 2007

alee via DotNetMonster.com wrote:
> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState'

C# is case sensetive while VB is not. Have you checked the exact name,
so it isn't for example "objectState"?

> - my approach:
>
> using txScope
> {
> ...
> }
> - Visual Studio:
>
> Syntax error, '(' expected

using (txScope) {
...
}

--
Göran Andersson
_____
http://www.guffa.com

alee
Sat Feb 17 22:24:04 CST 2007

Lucas,

Thanks for your suggestions. The using syntax works fine now.

However, I have tried several method to define the following VB.NET
equivalence without any luck.

VB.NET

Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of
T)

C# - tried

public abstract class BaseList<T as BaseObject> : BindingList<T>
public abstract class BaseList<T:BaseObject> : BindingList<T>

I just want to the generic T to inherit properties defined in BaseObject.

Cheers,

Alan L.




sturnfie@gmail.com wrote:
>> - my approach:
>> public void AcceptChanges()
>[quoted text clipped - 6 lines]
>> }
>> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState'
>
>What is your definition for "T"? I am assuming this article is using
>it as a generic object, meaning you need to create it and what it is
>supposed to be; in this case, give it a property of "ObjectState".
>Read the article to figure out what the expectations of the object are
>(namely, what it is supposed to be based on).
>
>> - my approach:
>>
>[quoted text clipped - 5 lines]
>>
>> Syntax error, '(' expected
>
>This is an issue of scope. The proper syntax is:
>
>using (txScope)
>{
> ....
>}
>
>--
>lucas

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alee
Sat Feb 17 22:27:45 CST 2007

Hi Goran,

Thanks. The using syntax works, but I still have problem converting the
definition
for the generic T. I

public abstract class BaseList<T of BaseObject> : BindingList<T>

- I want the generic key argument inherits properties defined in BaseObject.

Originaal VB.NET syntax is:

Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of
T)

Cheers,

Alan L.


Göran Andersson wrote:
>> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState'
>
>C# is case sensetive while VB is not. Have you checked the exact name,
>so it isn't for example "objectState"?
>
>> - my approach:
>>
>[quoted text clipped - 5 lines]
>>
>> Syntax error, '(' expected
>
>using (txScope) {
> ...
>}
>

--
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mehdi
Sun Feb 18 04:46:49 CST 2007

On Feb 17, 7:52 pm, "alee via DotNetMonster.com" <u31808@uwe> wrote:
> Hello,
>
> I am trying to convert a program from Microsoft VB.NET team:
>
> http://blogs.msdn.com/vbteam/archive/2005/04/14/TableAdaptersAndObjec...
>
> I am having a hard time converting the following two sections. Anyone knows
> the C# equivalent?
>
> - oringial VB.NET code from VB Team:
> Public Sub AcceptChanges()
>
> For Each item As T In Me.Items
>
> item.ObjectState = ObjectState.Unchanged
>
> Next
>
> DeletedRows.Clear()
>
> End Sub
>
> - my approach:
> public void AcceptChanges()
> {
> foreach (T item in this.Items)
> {
> item.ObjectState = ObjectState.Unchanged;
> }
> DeletedRows.Clear();
> }
> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState'
>
> 2. Original code from VB team:
>
> Dim txScope As New System.Transactions.TransactionScope
>
> Using txScope
> ...
> end using
>
> - my approach:
>
> using txScope
> {
> ...
> }
> - Visual Studio:
>
> Syntax error, '(' expected
>
> Best regards,
>
> Alan L.
>
> --
> Message posted viahttp://www.dotnetmonster.com

Hi,

The first equivalent:
Well, you are trying to use a class (T) that is supposed to have an
ObjectState property. However, this should be explicitly declared
using the "where" keyword in C#. You need to change the class
definition to something as follows:

public class MyClass<T> where T: BizObjBase

this tells the compiler that T is of type BizObjBase...

The second equivalent:
using (TransactionScope txScope = new TransactionScope())
{
//do whatever you need with txScope
}

HTH,
Mehdi

guffa
Sun Feb 18 07:48:40 CST 2007

If you have a base class for all objects that the class handles, then
you don't need to use generics at all in your class. Just use the base
class when you inherit the BindingList.

public abstract class BaseList : BindingList<BaseObject>

Now your BaseList is a BindingList that handles any object that inherits
from BaseObject.

In your method that loops the items, just reference them as BaseObject:

public void AcceptChanges() {
foreach (BaseObject item in this.Items) {
item.ObjectState = ObjectState.Unchanged;
}
DeletedRows.Clear();
}

alee via DotNetMonster.com wrote:
> Hi Goran,
>
> Thanks. The using syntax works, but I still have problem converting the
> definition
> for the generic T. I
>
> public abstract class BaseList<T of BaseObject> : BindingList<T>
>
> - I want the generic key argument inherits properties defined in BaseObject.
>
> Originaal VB.NET syntax is:
>
> Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of
> T)
>
> Cheers,
>
> Alan L.
>
>
> Göran Andersson wrote:
>>> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState'
>> C# is case sensetive while VB is not. Have you checked the exact name,
>> so it isn't for example "objectState"?
>>
>>> - my approach:
>>>
>> [quoted text clipped - 5 lines]
>>> Syntax error, '(' expected
>> using (txScope) {
>> ...
>> }
>>
>


--
Göran Andersson
_____
http://www.guffa.com

Alvin
Sun Feb 18 19:47:57 CST 2007

Google instant C#, this application will translate your VB code into C#. It
is very good.

--
Regards,
Alvin Bruney
------------------------------------------------------
Shameless author plug
Excel Services for .NET is coming...
OWC Black book on Amazon and
www.lulu.com/owc
Professional VSTO 2005 - Wrox/Wiley


"alee via DotNetMonster.com" <u31808@uwe> wrote in message
news:6df2e29b449bc@uwe...
> Hello,
>
> I am trying to convert a program from Microsoft VB.NET team:
>
> http://blogs.msdn.com/vbteam/archive/2005/04/14/TableAdaptersAndObjects.aspx
>
> I am having a hard time converting the following two sections. Anyone
> knows
> the C# equivalent?
>
>
> - oringial VB.NET code from VB Team:
> Public Sub AcceptChanges()
>
> For Each item As T In Me.Items
>
> item.ObjectState = ObjectState.Unchanged
>
> Next
>
> DeletedRows.Clear()
>
> End Sub
>
> - my approach:
> public void AcceptChanges()
> {
> foreach (T item in this.Items)
> {
> item.ObjectState = ObjectState.Unchanged;
> }
> DeletedRows.Clear();
> }
> - Visusal Studio error: 'T' does not contain a definition for
> 'ObjectState'
>
> 2. Original code from VB team:
>
> Dim txScope As New System.Transactions.TransactionScope
>
> Using txScope
> ...
> end using
>
> - my approach:
>
> using txScope
> {
> ...
> }
> - Visual Studio:
>
> Syntax error, '(' expected
>
> Best regards,
>
> Alan L.
>
> --
> Message posted via http://www.dotnetmonster.com
>

Barry
Sun Feb 18 19:56:42 CST 2007

alee via DotNetMonster.com wrote:

> Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of
> T)

public abstract class BaseList<T> : BindingList<T>
where T : BaseObject


-- Barry

--
http://barrkel.blogspot.com/

alee
Sun Feb 18 22:34:12 CST 2007

Hello Mehdi,

Thanks for your suggestions, and they work well.

Regards,

Alan L.

mehdi wrote:
>> Hello,
>>
>[quoted text clipped - 53 lines]
>> --
>> Message posted viahttp://www.dotnetmonster.com
>
>Hi,
>
>The first equivalent:
>Well, you are trying to use a class (T) that is supposed to have an
>ObjectState property. However, this should be explicitly declared
>using the "where" keyword in C#. You need to change the class
>definition to something as follows:
>
>public class MyClass<T> where T: BizObjBase
>
>this tells the compiler that T is of type BizObjBase...
>
>The second equivalent:
>using (TransactionScope txScope = new TransactionScope())
>{
> //do whatever you need with txScope
>}
>
>HTH,
>Mehdi

--
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alee
Sun Feb 18 22:35:14 CST 2007

Hello Barry,

Thanks for your suggestion, and it does solve the problem.

Regards,

Alan L.

Barry Kelly wrote:
>> Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of
>> T)
>
>public abstract class BaseList<T> : BindingList<T>
> where T : BaseObject
>
>-- Barry
>

--
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alee
Sun Feb 18 22:38:24 CST 2007

Hi Goran

The BaseObject will be inherited by other classes. And I am defining an
extension to the
BindingList<T>.

I solved the problem by using the where keyworkd suggested by Barry and Mehdi.


Thanks for your feedback.

Regards,

Alan L.

Göran Andersson wrote:
>If you have a base class for all objects that the class handles, then
>you don't need to use generics at all in your class. Just use the base
>class when you inherit the BindingList.
>
>public abstract class BaseList : BindingList<BaseObject>
>
>Now your BaseList is a BindingList that handles any object that inherits
>from BaseObject.
>
>In your method that loops the items, just reference them as BaseObject:
>
>public void AcceptChanges() {
> foreach (BaseObject item in this.Items) {
> item.ObjectState = ObjectState.Unchanged;
> }
> DeletedRows.Clear();
>}
>
>> Hi Goran,
>>
>[quoted text clipped - 26 lines]
>>> ...
>>> }
>

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alee
Sun Feb 18 22:39:05 CST 2007

Hello Alvin,

I will look into using instant C# for my future projects.

Thanks and Regards,

Alan L.

Alvin Bruney [MVP] wrote:
>Google instant C#, this application will translate your VB code into C#. It
>is very good.
>
>> Hello,
>>
>[quoted text clipped - 52 lines]
>>
>> Alan L.

--
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