Pattern Matching

pattern-maching.cs

        static bool PatternMatching(object x) {
            // 'is' pattern variable
            if (x is int i && i > 0) return true;
            if (x is string k && k.Trim().Length > 0) return true;
            if (x is person p && p != null) return true;
            else return false;
                    
            // switch statement with pattern  'case' and 'when'
            switch (x) {
                case int a when a > 0: return true;
                case string t when t.Trim().Length > 0: return true;
                case person m when m != null: return true;
                default: return false;
            }
        }
        //demo class
        class person {
            public string fname { get; set; }
            public string sname { get; set; }
        }