• .net 附件下载


          突然感觉现在爱上了博客园,在这里可以看到许多网友的分享,可以一起平复受伤的心,所以,我也要充分利用博客园,将自已之前零零散散记录在记事本中的总结,记录在这里。与大家一起学习,也方便自己使用。

          本节总结,几种下载文件的方法,也是从网上搜到的。

            //TransmitFile下载
            protected void Button1_Click(object sender, EventArgs e)
            {
                /*        
                 * 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite   
                 * 下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。    
                 * 代码如下:     
                 *
                 */
                Response.Clear();
                Response.ClearContent();
                Response.ClearHeaders();
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;filename="+HttpUtility.UrlEncode("中国建设银行E路护航网银安全组件(大明).rar",Encoding.UTF8));
                string filename = Server.MapPath("中国建设银行E路护航网银安全组件(大明).rar");
                Response.TransmitFile(filename);
            }
            //流下载
            protected void Button2_Click(object sender, EventArgs e)
            {
                string fileName = "下载文件.rar";//客户端保存的文件名    
                string filePath = Server.MapPath(fileName);//转化为当前项目下的路径    
                FileInfo fileInfo = new FileInfo(filePath);     
                Response.Clear();   
                Response.ClearContent();    
                Response.ClearHeaders();
                Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8));   
                Response.AddHeader("Content-Length", fileInfo.Length.ToString());    
                Response.AddHeader("Content-Transfer-Encoding", "binary");   
                Response.ContentType = "application/octet-stream";     
                Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");   
                Response.WriteFile(fileInfo.FullName);     
                Response.Flush();   
                Response.End();
           
            }
             /// <summary>
            /// 分块下载文件
            /// </summary>
            /// <param name="strPath">文件的相对路径</param>
            /// <param name="fileName">文件名称</param>
            protected void fileDown(string strPath, string fileName)
            {
                string filePath = Server.MapPath(strPath);//转化为当前项目下的路径     
                System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
                if (fileInfo.Exists == true)
                {  //文件存在
                    const long ChunkSize = 102400;//100K 每次读取文件,只读取100K,这样可以缓解服务器的压力 
                    byte[] buffer = new byte[ChunkSize];
                    Response.Clear();
                    System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
                    long dataLengthToRead = iStream.Length;//获取下载的文件总大小                
    
                    Response.ContentType = "application/octet-stream";
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8));
                    while (dataLengthToRead > 0 && Response.IsClientConnected)
                    {
                        int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小   
                        Response.OutputStream.Write(buffer, 0, lengthRead);
                        Response.Flush();
                        dataLengthToRead = dataLengthToRead - lengthRead;
                    }
                    Response.Flush();
                    Response.End();
                    Response.Close();
                }
                else
                {              
                    Response.Write("<script>window.opener=null;window.open('','_top');alert('文件不存在!');window.top.close();</script>");
                   
                }
            }
    
    public void DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )
    
    {
    
      WebForm.Response.ClearHeaders();
    
      WebForm.Response.Clear();
    
      WebForm.Response.Expires = 0;
    
      WebForm.Response.Buffer = true;
    
      WebForm.Response.AddHeader("Accept-Language", "zh-tw");
    
      //文件名称
    
      WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");
    
      WebForm.Response.ContentType = "Application/octet-stream";
    
      //文件内容
    
      WebForm.Response.Write(FileBody);
    
         WebForm.Response.End();
    
    }
    
    //上面这段代码是下载一个动态产生的文本文件,若这个文件已经存在于服务器端的实体路径,则可以通过下面的函数:
    
    public void DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )
    
    {
    
      WebForm.Response.ClearHeaders();
    
      WebForm.Response.Clear();
    
      WebForm.Response.Expires = 0;
    
        WebForm.Response.Buffer = true;
    
      WebForm.Response.AddHeader("Accept-Language", "zh-tw");
    
      //文件名称
    
      WebForm.Response.AddHeader("content-disposition", "attachment; filename='" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );
    
      WebForm.Response.ContentType = "Application/octet-stream";
    
      //文件内容
    
      WebForm.Response.Write(System.IO.File.ReadAllBytes(FilePath));
    
      WebForm.Response.End();
    
    }
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  • 原文地址:https://www.cnblogs.com/dreamflycc/p/2974817.html
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