The exception filter

The exception filter feature isn't very old at the time of writing—it was introduced in C# 6. The main benefit of this is that you can catch more specific exceptions in a block. Let's look at an example:

using System;

namespace ExceptionCode
{
 class Program
 {
 static void Main(string[] args)
 {

 int[] a = new int[] {1,2,3};

 try
 {
 Console.WriteLine(a[5]);
 }
 catch (IndexOutOfRangeException ex) when (ex.Message == "Test Message")
 {
 Console.WriteLine("Message:");
 Console.WriteLine("Test Message");
 }
 catch (IndexOutOfRangeException ex) when (ex.Message == "Index was outside the bounds of the array.")
 {
 Console.WriteLine("Message:");
 Console.WriteLine(ex.Message);
 Console.WriteLine("Stack Trace:");
 Console.WriteLine(ex.StackTrace);
 Console.WriteLine("String:");
 Console.WriteLine(ex...