#1,219 – C# 6.0 – Filtering Exceptions

C# 6.0 will include support for exception filters, that is–only catching a particular type of exception if an associated expression evaluates to true.

You can filter exceptions by including an if statement after the catch expression.  If the result of evaluating the expression supplied is true, the exception is caught.  If not, the behavior is as if you didn’t supply a catch block.

In the example below, we don’t catch divide by zero exceptions on Saturdays.

            int denom;
            try
            {
                denom = 0;
                int x = 5 / denom;
            }
            // Catch /0 on all days but Saturday
            catch (DivideByZeroException xx) if (DateTime.Now.DayOfWeek != DayOfWeek.Saturday)
            {
                Console.WriteLine(xx);
            }