How do you pass a generic delegate argument to a m

问题:

I have a class with a delegate declaration as follows...

Public Class MyClass  
    Public Delegate Function Getter(Of TResult)() As TResult    

    ''#the following code works.
    Public Shared Sub MyMethod(ByVal g As Getter(Of Boolean))
        ''#do stuff
    End Sub
End Class

However, I do not want to explicitly type the Getter delegate in the Method call. Why can I not declare the parameter as follows...

... (ByVal g As Getter(Of TResult))

Is there a way to do it?

My end goal was to be able to set a delegate for property setters and getters in the called class. But my reading indicates you can't do that. So I put setter and getter methods in that class and then I want the calling class to set the delegate argument and then invoke. Is there a best practice for doing this.

I realize in the above example that I can set set the delegate variable from the calling class...but I am trying to create a singleton with tight encapsulation.

For the record, I can't use any of the new delegate types declared in .net35.

Answers in C# are welcome.

Any thoughts?

Seth

回答1:

You need to add a generic type parameter to the method:

Public Shared Sub MyMethod(Of TResult) (ByVal g As Getter(Of TResult))

In C#, that would be

public static void MyMethod<TResult>(Getter<TResult> g) {

回答2:

You can make the method that accepts the generic delegate itself generic:

Public Shared Sub MyMethod(Of TResult)(ByVal g As Getter(Of TResult))
    'do stuff
End Sub