AssertionCondition on this parameter not working.

/// /// Will Assert in debug build when obj is null. /// ]]>
[Conditional("DEBUG")]



public static void CantBeNull]]>( this T obj) where T : class
{
if (obj == null)
{
Debug.Assert(false, "Object of type '" + typeof(T) + "' can't be null.");
}
}

This method doesn't work as it should, if I would replace the parameters as in (this string test, T obj) and call "".CantBeNull(someObj) then it works.

But now Resharper still says on the first following call that the obj could generate a NullReferenceException.

someObj.CantBeNull(); // Doesn't work
"".CantBeNull(someObj); // With the changed parameters does work