var tuple = new Tuple<int, int,string>(1, 2,"hello");Console.WriteLine(tuple.Item1);Console.WriteLine(tuple.Item2);Console.WriteLine(tuple.Item3);

  //需要我们在nuget上安装 System.ValueTuplevar tuple = (1, 2);var tuple2 = ValueTuple.Create(1, 2);  var tuple3 = new ValueTuple<int, int>(1, 2);Console.WriteLine($"{tuple.Item1}and{tuple.Item2}");

 　　　　　　 var named = (first: "one", second: "two");Console.WriteLine($"{named.first}");   //7.0var sum = 12.5;var count = 5;var accumulation = (count, sum);Console.WriteLine($"{accumulation.count}");   //需要我们的语言版本是7.1

  　　　　　　(int a, int b) nullableTuple = (9, 8);  //左边命名
            Console.WriteLine(nullableTuple.a);(int a, int b) nullableTuple2 = (one: 9, two: 8);  //左右两边命名，右边的命名会被忽略

     //valueType作返回值var tt = TestValueTuple();Console.WriteLine(tt.i);(int i, int j) = TestValueTuple();Console.WriteLine(i);var (z, x) = TestValueTuple();Console.WriteLine(z);

           public static (int i, int j) TestValueTuple(){return (8, 9);}

        public class Person{public string FirstName { get; set; }public string MiddleName { get; set; }public string LastName { get; set; }public string City { get; set; }public string State { get; set; }public Person(string fname, string mname, string lname,string cityName, string stateName){FirstName = fname;MiddleName = mname;LastName = lname;City = cityName;State = stateName;}// Return the first and last name.public void Deconstruct(out string fname, out string lname){fname = FirstName;lname = LastName;}public void Deconstruct(out string fname, out string mname, out string lname){fname = FirstName;mname = MiddleName;lname = LastName;}public void Deconstruct(out string fname, out string lname,out string city, out string state){fname = FirstName;lname = LastName;city = City;state = State;}         }

 Person p = new Person("John", "Quincy", "Adams", "Boston", "MA");//他会根据你的前面的参数个数自动去匹配Deconstruct重载(string fName, string lName, string city, string state) = p;Console.WriteLine($"Hello {fName} {lName} of {city}, {state}!");(string name, string lname) = p;Console.WriteLine($"{name}");