Pattern matching

C# 7.0 introduces an aspect common to functional programming languages with pattern matching. This new kind of construct can test values in different ways. To accomplish this, two language constructs in C# 7.0 have been enhanced to take advantage of patterns. These are as follows:

• The is expression
• The case clause in switch statements

With regard to the is expression, developers can now have a pattern on the right instead of just a type. When it comes to switch statements, the case clause can now match on patterns. The switch statement is no longer limited to primitive types and can switch on anything. Let's start by looking at the is expression.