ASP.NET文件下载函数使用浅析

来源:转载

ASP.NET文件下载函数使用是什么情况呢?在你的Page_Load中添加这样的代码:

Page.Response.Clear();  bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称", @"源文件路径", 1024000);   if (!success)       Response.Write("下载文件出错!");  Page.Response.End();
ASP.NET文件下载函数代码为:

public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)      {          try         {              FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);              BinaryReader br = new BinaryReader(myFile);              try             {                  _Response.AddHeader("Accept-Ranges", "bytes");                  _Response.Buffer = false;                  long fileLength = myFile.Length;                  long startBytes = 0;                         double pack = 10240; //10K bytes                  //int sleep = 200;   //每秒5次   即5*10K bytes每秒                  int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;                  if (_Request.Headers["Range"] != null)                  {                      _Response.StatusCode = 206;                      string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});                      startBytes = Convert.ToInt64(range[1]);                  }                  _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());                  if (startBytes != 0)                  {                      //Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));                  }                  _Response.AddHeader("Connection", "Keep-Alive");                  _Response.ContentType = "application/octet-stream";                  _Response.AddHeader("Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );                                 br.BaseStream.Seek(startBytes, SeekOrigin.Begin);                  int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;                   for (int i = 0; i < maxCount; i++)                  {                      if (_Response.IsClientConnected)                      {                          _Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString())));                          Thread.Sleep(sleep);                      }                      else                     {                          i=maxCount;                       }                  }              }              catch             {               return false;              }              finally              {                  br.Close();                   myFile.Close();              }          }          catch         {              return false;          }          return true;      }
这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.

ASP.NET文件下载函数的基本情况就向你介绍到这里,希望对你了解ASP.NET文件下载函数有所帮助。

 

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