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.NET Forum / .NET Framework / New Users / February 2007Anyone 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. > - 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 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. >> - my approach: >> public void AcceptChanges() [quoted text clipped - 23 lines] >-- >lucas > Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of > T) public abstract class BaseList<T> : BindingList<T> where T : BaseObject -- Barry  Signaturehttp://barrkel.blogspot.com/ Hello Barry, Thanks for your suggestion, and it does solve the problem. Regards, Alan L. >> Public MustInherit Class BaseList(Of T As BaseObject) Inherits BindingList(Of >> T) [quoted text clipped - 3 lines] > >-- Barry > - 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) { ... } SignatureGöran Andersson _____ http://www.guffa.com 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. >> - Visusal Studio error: 'T' does not contain a definition for 'ObjectState' > [quoted text clipped - 10 lines] > ... >} 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] >> ... >> } SignatureGöran Andersson _____ http://www.guffa.com 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. >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 [quoted text clipped - 19 lines] >>> ... >>> } > 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 Hello Mehdi, Thanks for your suggestions, and they work well. Regards, Alan L. >> Hello, >> [quoted text clipped - 22 lines] >HTH, >Mehdi Google instant C#, this application will translate your VB code into C#. It is very good. SignatureRegards, 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 > Hello, > [quoted text clipped - 52 lines] > > Alan L. Hello Alvin, I will look into using instant C# for my future projects. Thanks and Regards, Alan L. >Google instant C#, this application will translate your VB code into C#. It >is very good. [quoted text clipped - 4 lines] >> >> Alan L. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. 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