案例1:

static void Main()        {            int[] ary = { 12, 13, 103, 10003 };            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 = 0;            numLargerThan100 = 0;            numLargerThan1000 = 0;            foreach (var a in ary)            {                if (a > 1000)                    numLargerThan1000++;                else if (a > 100)                    numLargerThan100++;                else if (a > 10)                    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

 

 

案例2:

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);          }      }  输出结果:

x=1,y=2

x1=2,y1=11