Keyword Implementation in C#

Is there a way, and how would I go about implementing my own keyword such as in, and as (etc), to be used in my code?

Here is what I had in mind. I want to (just for my own personal开发者_运维知识库 reasons, I guess) add a few keywords of my own, one of which would be the "was" keyword:

if(Control was Clicked)
{
   // etc etc
}

No.

The closest you could get would be an extension method:

Control.WasClicked()

No, you can't add to the C# language, short of writing your own compiler.

However, your "was" keyword makes me think you might be looking for a way to declaratively handle events. Microsoft have a library called "Reactive Extensions for .NET" (Rx) that is an extension to LINQ that allows you to deal with events in a declarative fashion.

No, you cannot add keywords to C# - at least not without writing a compiler for yourself. If what you want to do is simple, however, perhaps you could do it using a custom preprocessor. You would lose some syntax highlighting and error checking in Visual Studio, though.

One language for the CLR, that is designed to be extensible like that, is Boo.