C # tuple<t1,t2 .... t> Use of tuples

1)

First say the tuple: a data structure, separated by commas, that is used to pass a combination of values to a program or operating system.

NET Framework directly supports tuples of one to seven elements

Tuple<T1> Tuple<T1, T2> Tuple<T1, T2, T3> Tuple<T1, T2, T3, T4> Tuple<T1, T2, T3, T4, T5> Tuple<T1, T2, T3, T4, T5, T6> Tuple<T1, T2, T3, T4, T5, T6, T7>
Rest property by using the objects in the nested tuple Tuple < T1, T2, T3, T4, T5, T6, T7, trest ; object.

A simple example:

            The tuple of an element tuple<int> test = new Tuple<int> (34);            Two elements of the tuple 1<n<8 tuple<string, int> test2 = tuple.create<string, int> ("str", 2);            Tuple<int, int> test2_1 = new Tuple<int, int> (2,2); Tuple of 8 elements (note,tuple< type ...);: Base "type" up to 7, eighth element type must also be a tuple) tuple<int, int, int, int, int, int, int, TUPLE&L t;int>> test3 = new tuple<int, int, int, int, int, int, int, tuple<int>> (1, 2, 3, 4, 5, 6, 7                        , New Tuple<int> (8)); This can also be tuple<int, int, tuple<int, int>> test_i_i_tii = new Tuple<int, int, tuple<int, int&gt                        ;> (1,1,new tuple<int,int> (2,3)); Console.WriteLine (Test.            ITEM1); Console.WriteLine (test2. Item1 + test2.            ITEM2);            Console.WriteLine (test2_1.item1 + test2_1.item2); Console.WriteLine (Test3. Item1 + test3. ITEM2 + test3. Item3 + test3. IteM4 + Test3. ITEM5 + test3. ITEM6 + test3. Item7 + test3. REST.ITEM1);

Results:


2) Multiple return value issues
In general, we use the Out keyword (compared to other languages, such as the Golang,out keyword or a little bit of a hassle), we can do this by using a tuple:

Namespace tupledemo{class Program {static void Main (string[] args) {//Use out to get multiple return values            String outparam = "";            int returnvalue = Funoutparamdemo (out outparam);            Console.WriteLine (returnvalue + "" + Outparam);            Use tuples to get multiple return values Tuple<int, string> r = Funtupleparamdemo ();            Console.WriteLine (R.item1 + "" + r.item2);        Console.read (); }///<summary>///OUT keyword, implementation returns two return values///</summary>//<param name= "O" ><            /param>//<returns></returns> public static int Funoutparamdemo (out string o) {            o = "ReturnValue";        return 10; }///<summary>//Use tuples to implement "indirect" return "two" return values///</summary>//<returns></ret urns> public static Tuple<int, string> Funtupleparamdemo () {return new tuple<int, String&gt ;(10,"ReturnValue"); }    }}

Operation Result:

C # tuple<t1,t2 .... t> Use of tuples