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C# generics usercontrol

I would like to define the following control:

public partial class ObjectSelectorControl<T> : UserControl where T : class 

The problem is that the designer can't resolve this. Is there a workaround to this issue?

like image 243
Toto Avatar asked Aug 25 '09 16:08

Toto


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2 Answers

This works

public class Control1<T> : UserControl { ... }  public class Control2 : Control1<double> { ... }  public class Control3 : Control2 { ... } 

had read it here:

Generic User Controls?

like image 190
P.K Avatar answered Sep 18 '22 12:09

P.K


Sounds much like what we do in our project.

There's a base class that is generic:

public partial class controlItemList<TBaseItem, TBaseItemCollection> : UserControl, IUIDispatcher
    where TBaseItem : new()
    where TBaseItemCollection : IItemCollection<TBaseItem>

Then for each use we define a non-generic version (which still couldn't be used by designer):

public class controlMessagesNonGenericParent : controlItemList<MailItem, MailItemCollection>
{
}

... and then we have derived controls that could be used in designer:

public partial class controlMessages : controlMessagesNonGenericParent
{
...
}
like image 27
Filip Navara Avatar answered Sep 18 '22 12:09

Filip Navara