How to invoke static method in C#4.0 with dynamic type?

Question

In C#4.0, we have dynamic type, but how to invoke static method of dynamic type object?

Below code will generate exception at run time. The dynamic

Answer 1

One possible workaround would be to use reflection.

dynamic d = new Foo();

var sum = (int)d.GetType()
                .GetMethod("Sum")
                .Invoke(d, new object[] { 1, 3 });
Console.WriteLine(sum);

Answer 2

This is not supported directly by C# 4 but there's an interesting workaround in this blog post: http://blogs.msdn.com/davidebb/archive/2009/10/23/using-c-dynamic-to-call-static-members.aspx

Answer 3

While C# doesn't support it, the DLR does. You can programmatically access the dlr calls with Dynamitey

var staticContext = InvokeContext.CreateStatic ;

Console.WriteLine(Dynamic.InvokeMember(staticContext(typeof(Foo)), "Sum", 1,3));