static void Main()

        {

            int[] ary = { , , ,  };

            int numLargerThan10,numLargerThan100,numLargerThan1000 ;

            Proc(ary, out numLargerThan10, out numLargerThan100, out numLargerThan1000);

            Console.WriteLine("有{0}个数大于10，有{1}个数大于100，有{2}个数大于1000",numLargerThan10,numLargerThan100,numLargerThan1000);

            Console.Read();

        }

        static void Proc(int[] ary, out int numLargerThan10, out int numLargerThan100, out int numLargerThan1000)

        {

            numLargerThan10 = ;

            numLargerThan100 = ;

            numLargerThan1000 = ;

            foreach (var a in ary)

            {

                if (a > )

                    numLargerThan1000++;

                else if (a > )

                    numLargerThan100++;

                else if (a > )

                    numLargerThan10++;

            }

        }

输出结果:
有2个数大于10，有1个数大于100，有1个数大于1000

class Program

   {

       //使用out后必须对变量赋值

       public void TestOut(out int x, out int y)

       {

           x = ;

           y = ;

       }

       //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 = ;   

       }

       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 = ;

           int Y1 = ;

           P1.TestRef(ref x1,ref Y1);

           Console.WriteLine("x1={0},y1={1}", x1, Y1);

       }

   }  

输出结果:

x=1,y=2
x1=2,y1=11