C# - 将泛型委托转换为非泛型委托

Question

I have a generic delegate that accepts a argument, Args<T> . I also have a normal delegate which accepts Args .

delegate Task ExampleDelegate<T>(Args<T> args)

delegate Task ExampleDelegate(Args args)

Args<T> extends from Args

public class Args {

}

public class Args<T> : Args {

}

I am currently extending my non generic interfaces/classes which use ExampleDelegate to create new generic interfaces/classes using ExampleDelegate<T> .

Since all of them extend the non-generic versions, it has been painless to extend them so far until I had to override a method which accepts ExampleDelegate .

I haven't been able to cast ExampleDelegate<T> into ExampleDelegate since the signatures don't match.

One of the ways I was able to this was,

ExampleDelegate<SomeClass> genericDelegate= //some method

//First case
ExampleDelegate nonGenericDelegate = args => genericDelegate(args as Args<SomeClass>);

//Second case
genericDelegate = argsT => nonGenericDelegate(argsT as Args);

Is there any better way of doing this?

I understand why I need to cast in the first case, but I don't see why I need to cast explicitly in the second case as well? ( Args<T> extends from Args )

Answer 1

Is there any better way of doing this?

Probably yes, but we don't know what you are trying to do so we can't help you

I don't see why I need to cast explicitly in the second case as well?

You don't...? Here is some code that compiles just fine:

class TestClass
{
    void DoStuff()
    {
        ExampleDelegate nonGeneric = a => { };
        ExampleDelegate<int> generic = b => nonGeneric(b);
    }
}

delegate void ExampleDelegate(Args args);

delegate void ExampleDelegate<T>(Args<T> args);

class Args<T> : Args {}

class Args {}