Is there a way to test if a variable is dynamic?

Question

The following piece of code will always return true unless the variable v is null:

v is dynamic

and the following

Answer 1

There will always be a run-time type as others have said.

There is a hack to detect for local variables, relying on the fact that dynamic variables doesn't support extension methods.

static void DummyDynamicTest(this T t) //extension method
{

}

dynamic test = 1;
try
{
    test.DummyDynamicTest();
    //not dynamic
}
catch (RuntimeBinderException)
{
    //dynamic
}

However you can't refactor the functionality into another method. This can't be very useful at all in any meaningful scenarios, ignore at any cost.