using System;using System.Collections.Generic;using System.Text;using System.IO; namespace _5_1{    class Program    {        static void Main(string[] args)        {            Stream s = null;            try            {                s = new MemoryStream();                writestream(s);                                                             readstream(s);                Console.WriteLine("-------------------");                bulkwritestream(s);                bulkreadstream(s);                seekstream(s);             }            finally            {                s.Close();             }         }        private static void writestream(Stream s)          //向流中一个字节一个字节（这里写入的是整数，必须小于256）写入数据。        {               for (int i = 0; i < 10; i++)                s.WriteByte((byte)i);        }         private static void readstream(Stream s)         //从流中读入之前写入的字节        {                     s.Position = 0;  //写的过程中，流的位置已经到了流的末尾，理所当然，读的时候，要把流的位置放在流的最前面，顺着读嘛。（倒着读就不用了，后面有）            int i = 0;            while ((i = s.ReadByte()) != -1) // 到流的末端返回-1            {                Console.WriteLine(i);            }                   }         private static void bulkreadstream(Stream s)       //这里读取流中所有数据到 一个数组中。        {                        s.Position = 0;            byte[] arr = new byte[s.Length];          //存放流中数据的数组            int bytesread = 0;            int bytes2read = (int)s.Length;          //流的长度，需要读取的字节数，在这里是整个流中的字节数。            while (bytes2read > 0)                                               {                int val = s.Read(arr, bytesread, bytes2read); //第一个参数是要读取到的目标数组（从流中读取数据），第二个是已经读取的字节数，第三个参数是还需要读取的字节数                //val返回值是读取字节数，如果到达流的末端，则为0                 Console.WriteLine("------"+"val="+val+"-----"); //可以测试下val的值                if (val == 0)                    break;                bytes2read -= val;                bytesread += val;            }             for (int i = 0; i < arr.Length; i++)            {                Console.Write(arr[i] + "  ");                //if (i > 0 && i % 20 == 0)            //每行显示20个数字                //    Console.WriteLine();            }            Console.WriteLine();                   }         private static void bulkwritestream(Stream s)            //向当前流中写入字节序列        {            s.Position = 0;             byte[] bytes = new byte[10] { 10,20,30,40,50,60,70,80,90,100};            s.Write(bytes, 0, 10);            s.Flush();  //不知道有什么用？？？？？        }        private static void seekstream(Stream s)            //从流的后面往前面读取流中数据        {             long start = -1;            while (s.Position != 1)            {                Console.WriteLine("s 所在位置："+s.Position );                long position = s.Seek(start, SeekOrigin.End);                         Console.WriteLine(s.ReadByte());                --start;            }                 }    }}

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