元组:一个数据结构,逗号分隔,用于传递一个程序或者操作系统的一系列值得组合
NET Framework直接支持一至七元素得数组
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>
还可以通过嵌套得元组中得对象创建八个/多个元素得元组再Rest属性中的Tuple<T1,T2,T3,T4,T5,T6,T7,TRestle>对象
单的示例:
- //一个元素的元组
- Tuple<int> test = new Tuple<int>(34);
- //两个元素的元组 1<n<8
- Tuple<string, int> test2 = Tuple.Create<string, int>("str", 2);
- Tuple<int, int> test2_1 = new Tuple<int, int>(2,2);
- //8个元素的元组(注意,Tuple<类型...>: 基本"类型"最多7个, 第八个元素类型必须也为元组)
- Tuple<int, int, int, int, int, int, int, Tuple<int>> test3 =
- new Tuple<int, int, int, int, int, int, int, Tuple<int>>(1, 2, 3, 4, 5, 6, 7, new Tuple<int>(8));
- //也可以这样
- Tuple<int, int, Tuple<int, int>> test_i_i_Tii = new Tuple<int, int, Tuple<int, int>>(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);
结果:
2)多个返回值问题
一般我们都是用out关键字(相比其他语言,如golang,out关键字还是稍微有点麻烦),此时我们可以使用元组实现:
- namespace TupleDemo
- {
- class Program
- {
- static void Main(string[] args)
- {
- //使用out拿到多个返回值
- string outparam = "";
- int returnvalue = FunOutParamDemo(out outparam);
- Console.WriteLine(returnvalue + " " + outparam);
- //使用元组拿到多个返回值
- Tuple<int, string> r = FunTupleParamDemo();
- Console.WriteLine(r.Item1 + " " + r.Item2);
- Console.Read();
- }
- /// <summary>
- /// out关键字,实现返回两个返回值
- /// </summary>
- /// <param name="o"></param>
- /// <returns></returns>
- public static int FunOutParamDemo(out string o)
- {
- o = "returnValue";
- return 10;
- }
- /// <summary>
- /// 使用元组实现【间接】返回【两个】返回值
- /// </summary>
- /// <returns></returns>
- public static Tuple<int, string> FunTupleParamDemo() {
- return new Tuple<int, string>(10, "returnValue");
- }
- }
- }
运行结果:
原博客地址https://www.cnblogs.com/mschen/p/8333903.html