C#实现文件上传及文件下载功能实例代码

publicActionResult Upload()
    {
      // var pathUrl = "http://" + Request.Url.Authority;
      var file = Request.Files["Filedata"];
      var uploadFileName = file.FileName;
      stringfilePath ="/File/"+ uploadFileName;
      stringAbsolutePath = Server.MapPath(filePath);
      file.SaveAs(AbsolutePath);      //将上传的东西保存    
      returnJson(new{ FileName = uploadFileName, FilePath = filePath });
    } 

publicActionResult DownLoad(stringFileName)
    {
      stringfileName = FileName;//客户端保存的文件名
      stringfilePath = Server.MapPath("/File/"+ FileName);//路径   
                                 //以字符流的形式下载文件  
      FileStream fs =newFileStream(filePath, FileMode.Open);
      byte[] bytes =newbyte[(int)fs.Length];
      fs.Read(bytes, 0, bytes.Length);
      fs.Close();
      Response.ContentType ="application/octet-stream";
      //通知浏览器下载文件而不是打开 
      Response.AddHeader("Content-Disposition","attachment; filename="+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
      Response.BinaryWrite(bytes);
      Response.Flush();
      Response.End();
      returnJson("");
    }