Pattern matching

Context: Pattern matching simplifies conditional logic by matching expressions against patterns. It is used in switch expressions, if statements, and more.

object obj = 42;
if (obj is int i)
{
    Console.WriteLine($"Integer: {i}");
}

Real-world usage example

Processing polymorphic events: Use pattern matching in a switch expression to handle different message types (e.g., UserCreated, OrderPaid) without casting.

Example: In Message processing pipelines, pattern matching simplifies the dispatcher.

Related sections

• 6.5.1 Constant pattern
• 6.5.2 Type pattern
• 6.5.3 Property pattern
• 6.5.4 Positional pattern
• 6.5.5 List patterns C# 11
• 6.5.6 var pattern