C# 中传参中的OUT 和 ref 区别 笔记

//out传参前需要对参数进行赋值处理，ref则不需要。
//out、ref 传参都可以对值进行改变
 1 static void Main(string[] args)
        {
            int I = 10;
            //int J = 10;
            //int I;
            int J;
            //int[] k=new int[5]{1,2,3,4,5};
            int[] k = new int[5];
            //int[] l = new int[5]{1,2,3,4,5};
            int[] l = new int[5];

            TestClass1 tc = new TestClass1();
            tc.testClass(ref I);
            tc.testClass1(out J);
            
            tc.testClass2(out k);
            tc.testClass3(ref l);

            Console.WriteLine("out I:"+I);
            Console.WriteLine("ref J:" + J);

            Console.WriteLine("out k[0]:" + k[0]);
            Console.WriteLine("ref l[0]:" + l[0]);
            Console.Read();
        }
        public  void testClass(ref int i)
        {
            i = 100;
        }
        public void testClass1(out int i)
        {
            i = 100;
        }
        public void testClass2(out int[] k)
        {
            k=new int[5];
            k[0] = 100;
        }
        public void testClass3(ref int[] l)
        {
            l = new int[5];
            l[0] = 100;
        }


    }