class Program 
       { 
           //使用out后必须对变量赋值 
           public void TestOut(out int x, out int y) 
           { 
               x = 1; 
               y = 2; 
           } 
           //此时传进来的值分别为x1:10,y1:11,输出之后的x1的值为2 

           public void TestRef(ref int x, ref int y) 
           { 
               //引用剪剪那句话传进来的是猪,出来的可能是头牛(很精辟！) 
               x = 2; 

           } 
           static void Main(string[] args) 
           { 
               int x; 
               int y; 
               Program P1 = new Program(); 
               P1.TestOut(out x,out y); 
               Console.WriteLine("x={0},y={1}", x, y); 
               //在使用之前ref必须对变量赋值 
               int x1 = 10; 
               int Y1 = 11; 
               P1.TestRef(ref x1,ref Y1); 
               Console.WriteLine("x1={0},y1={1}", x1, Y1); 
           } 
       }