CSharp7.0 / C#7.0新语法【部分】

using System;

namespace CSharp7._0
{
    class OutClass
    {
        public static void OutTest1(out string param)
        {
            param = "参数";
        }
    }

    class BaseInfo
    {
        public BaseInfo(string param1, out string param2)
        {
            param2 = param1;
        }
    }

    class SubInfo : BaseInfo
    {
        public SubInfo(string param1) : base(param1, out string param2)
        {
            Console.WriteLine(param2);
        }
    }
}

　　

using System;

namespace CSharp7._0
{
    class Point
    {
        public Point(string x, string y) => (X, Y) = (x, y);
        public string X { get; set; }
        public string Y { get; set; }
        public void OutPut1(out string x, out string y) => (x, y) = (X, Y);

        public static (int i, int j) Rang()
        {
            return (1, 2);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            //out关键字
            OutClass.OutTest1(out string param);
            Console.WriteLine(param);

            SubInfo subInfo = new SubInfo("a1");


            //元组
            (string param1, string param2) paramAll = ("p1", "p2");
            Console.WriteLine(paramAll.param1);

            var pAll = (p1: "12", p2: 13);
            Console.WriteLine(pAll.p2);

            var p = (1, "2");
            Console.WriteLine(p.Item1);

            Point point = new Point("1", "2");

            point.OutPut1(out string x, out string y);
            Console.WriteLine(x);

            (int i, int j) = Point.Rang();
            Console.WriteLine(i);


            //ref局部变量和返回结果
            string s = null;
            RefTest1(ref s);
            Console.WriteLine(s);

            //本地函数
           Console.WriteLine(BdFun("张三"));

            //增强泛型约束 见其他笔记
        }

        static void RefTest1(ref string s)
        {
            if (string.IsNullOrEmpty(s))
            {
                s = "ref参数";
            }
        }

        static string BdFun(string name)
        {
            return Ben(name);
            string Ben(string name)
            {
                return name + "1";
            }
        }
    }
}