Pattern matching

In a general way, pattern matching is a way to compare contents in predefined formats in an expression. The format is nothing but a combination of different matches.

In C# 7.0, pattern matching is a feature. With the use of this feature, we can implement method dispatch on properties other than the type of an object.

Pattern matching supports various expressions; let's discuss these with code-examples.

Note

Patterns can be constant patterns: Type patterns or Var patterns.

is expression

The is expression enables the inspection of an object and its properties and determines whether it satisfies the pattern:

public static string MatchingPatterUsingIs(object character) 
{ 
   if (character is null) 
   return $"{nameof(character)} is null. "; 
   if (character is char) 
   { 
      var isVowel = IsVowel((char) character) ? "is a
      vowel" : "is a consonent"; 
      return $"{character} is char and {isVowel}. "; 
   } 
   if (character is string) 
   { 
      var chars = ((string...