Question

This is my scenario:

Class Test  
{  
    public int TestMethod(string s)  
    {
        return s.length; 
    }  

    public void TestInvoker()  
    {    
        var result = Invoker.Call( (new Test()).TestMethod,"String");  
    }  
}

Class Invoker  
{  
    public static object Call(Delegate method, object input) {... Do stuff ...} 

}  

How can I do this? because “TestMethod” isn’t a Delegate, i could do it with Func<>, but I want to avoid instatiate a Func<> delegate each time i use the invoker.

Is this possible?

Answer 1

It is possible, but only if the method accepts a concrete delegate type; not Delegate itself.

If you change your method to

public static TReturn Call<TInput, TReturn>(Func<TInput, TReturn> method, TInput input)

, it will work fine.

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To be more precise, C# has an implicit conversion from a method group to a matching delegate type.