In C#, how do I keep certain method calls out of the codebase entirely?

Question

I\'m trying to get rid of all DateTime.Now method calls and replace them with my own GetNow() method, which may sometimes return a fixed date for t

Answer 1

Firstly, DateTime.Now is a property.
That means you don't need to put parenthesis after call.

Secondly, if by testing purposes you mean a framework like NUnit, you might want to check out Microsoft Moles which allows you to substitute any static method call with your own custom implementation while testing. Heck, it's cool:

[Test]
[ExpectedException (typeof (Y2KBugException))]
public void TestY2KBug ()
{
    MDateTime.NowGet = () => new DateTime (2001, 1, 1);
    Bomb.DetonateIfY2K ();
}


public static class Bomb {
    public static void DetonateIfY2K ()
    {
        if (DateTime.Now == new DateTime (2001, 1, 1))
            throw new Y2KBugException (); // take cover!
    }
}