Question

I’d like to use Reflection in combination with dynamic.
Lets say i have the following call

dynamic foo = External_COM_Api_Call()

Accessing an object that i receive using COM.

Now I’d like to do somthing like that:

String bar = foo.GetType().GetProperty("FooBar").GetValue(foo,null)

But i keep getting a null for the PropertyInfo.

Ideas?

Answer 1

Why using reflection when you could directly:

dynamic foo = External_COM_Api_Call();
string value = foo.FooBar;

That’s the whole point of the dynamic keyword. You no longer need reflection.

And if you want to use reflection then don’t use dynamic:

object foo = External_COM_Api_Call();
string bar = (string)foo
   .GetType()
   .InvokeMember("FooBar", BindingFlags.GetProperty, null, foo, null);

---

Here’s a full working example:

class Program
{
    static void Main()
    {
        var type = Type.GetTypeFromProgID("WScript.Shell");
        object instance = Activator.CreateInstance(type);
        var result = (string)type
            .InvokeMember("CurrentDirectory", BindingFlags.GetProperty, null, instance, null);
        Console.WriteLine(result);
    }
}