c-sharp-switch-expression-new-func.cs

            var userType = "";


            var result = userType switch
            {
                var t when string.IsNullOrEmpty(t) =>
                    new Func<string>(() => { Console.WriteLine("Default"); return "CALL_DEFAULT"; })(),

                "PLUS" =>
                    new Func<string>(() => { Console.WriteLine("Plus"); return "CALL_PLUS"; })(),

                "PREMIUM" =>
                    new Func<string>(() => { Console.WriteLine("Premium"); return "CALL_PREMIUM"; })(),

                "Ultimate" =>
                    new Func<string>(() => { Console.WriteLine("Ultimate"); return "CALL_ULTIMATE"; })(),

                _ =>
                    new Func<string>(() => { Console.WriteLine("Default"); return "CALL_DEFAULT"; })(),
            };

            Console.WriteLine(result);