Can I get the signature of a C# delegate by its type?

c# reflection delegates
fastcall picture fastcall · Jan 9, 2009 · Viewed 11k times · Source

Is there a straightforward way using reflection to get at the parameter list for a delegate if you have its type information?

For an example, if I declare a delegate type as follows

delegate double FooDelegate (string param, bool condition);

and later get the type information for that delegate type as follows

Type delegateType = typeof(FooDelegate);

Is it possible to retrieve the return type (double) and parameter list ({string, bool}) from that type info object?

Answer

Marc Gravell picture Marc Gravell · Jan 9, 2009 
    MethodInfo method = delegateType.GetMethod("Invoke");
    Console.WriteLine(method.ReturnType.Name + " (ret)");
    foreach (ParameterInfo param in method.GetParameters()) { 
        Console.WriteLine("{0} {1}", param.ParameterType.Name, param.Name);
    }

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