How to cast KeyValuePair passed as Parameter to Command_Executed?

Question

Seemingly simple concept but can't get past this.

I have a Command...the _Executed method receives a KeyValuePair (types don't matter) as it's Parameter.

myCommand_Executed(object sender, ExecutedRoutedEventArgs e)
    {
        KeyValuePair<System.Type, MyCustomArgs> kvp = e.Parameter as KeyValuePair<Type, MyCustomArgs>;
:
:
:
}

Can't do that as it's non-nullable. How do I accomplish this? I want to extract the KeyValuePair from e.Parameter.

Appreciate any insight and will happily post more code/information if necessary.

Answer 1

You must use an explicit cast, rather than an implicit one, as you have done.
Implicit cast:

KeyValuePair<System.Type, MyCustomArgs> kvp = e.Parameter as KeyValuePair<Type, MyCustomArgs>; 

Explicit cast:

KeyValuePair<System.Type, MyCustomArgs> kvp = (KeyValuePair<System.Type, MyCustomArgs>)e.Parameter;