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samples/CS8/Program.cs

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+namespace CS8 {
+  class Program {
+    // This is a "switch expression"
+    static int CalcResult(int input) => input switch
+    {
+      1 => 2,
+      2 => 3,
+      _ => throw new ArgumentException("Weiter geht's nicht")
+    };
+
+    // Property Pattern:
+    bool IsJune(DateTime dt) => dt is { Month: 6 };
+
+    public class Address {
+      public string? City { get; set; }
+      public string? Country { get; set; }
+    }
+
+    public class Customer {
+      // ...
+      public Address? Address { get; set; }
+    }
+
+    static void Main(string[] args) {
+      // Positional pattern (using a tuple - hence "tuple pattern")
+      // Important: this works with any deconstructable type!
+      (string, string) personInfo = ("Oli", "Sturm");
+      var (firstName, lastName) = personInfo;
+      // firstName ist jetzt "Oli" und lastName ist "Sturm"
+
+      // Nested property patterns:
+      var customer = new Customer
+      {
+        Address = new Address { City = "Castle Douglas", Country = "UK" }
+      };
+      if (customer is { Address: { City: "Castle Douglas" } }) {
+        Console.WriteLine("Dieser Kunde wohnt gleich um die Ecke");
+      }
+    }
+  }
+}