//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 = ;

             //int J = 10;

             //int I;

             int J;

             //int[] k=new int[5]{1,2,3,4,5};

             int[] k = new int[];

             //int[] l = new int[5]{1,2,3,4,5};

             int[] l = new int[];

             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[]);

             Console.WriteLine("ref l[0]:" + l[]);

             Console.Read();

         }

         public  void testClass(ref int i)

         {

             i = ;

         }

         public void testClass1(out int i)

         {

             i = ;

         }

         public void testClass2(out int[] k)

         {

             k=new int[];

             k[] = ;

         }

         public void testClass3(ref int[] l)

         {

             l = new int[];

             l[] = ;

         }

     }