简单的io操作

 1 DirectoryInfo di = new DirectoryInfo("e:/");
 2         FileInfo[] fis = di.GetFiles("*.jpg");
 3         FileInfo fi = fis[0];
 4         Response.Write("名字" + fi.Name+"<br>");
 5         Response.Write("大小" + fi.Length);
 6         Stream stream = fi.OpenRead();
 7 
 8         //建立个20K大小的字节数组
 9         byte[] buffer = new byte[20 * 1024];
         int index = 0;
         int length = 0;
         while ((length =stream.Read(buffer,0,20*1024)) > 0)
         {
             Response.Write("已读字节" + length + "<br>");
 
             index++;
             //拆分后,保存.bat文件
             string path = string.Format("e:/{0}.dat", index);
 
             //将读取的内容写入文件中
             Stream output = new FileStream(path, FileMode.Create);
             output.Write(buffer, 0, length);
 
             output.Close();
         }
         stream.Close();
         Response.Write("关闭流!");
     }