Exception filters in C# 6: their biggest advantage is not what you think
Exception filters are one of the major new features of C# 6. They take advantage of a CLR feature that was there from the start, but wasn’t used in C# until now. They allow you to specify a condition on a catch block:
static void Main() { try { Foo.DoSomethingThatMightFail(null); } catch (MyException ex) when (ex.Code == 42) { Console.WriteLine("Error 42 occurred"); } } As you might expect, the catch block will be entered if and only if ex.