文件下载

//TransmitFile实现下载      protected void Button1_Click(object sender, EventArgs e)    {        Response.ContentType = "application/x-zip-compressed";        Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");        string filename = Server.MapPath("DownLoad/z.zip");        Response.TransmitFile(filename);    }      //WriteFile实现下载      protected void Button2_Click(object sender, EventArgs e)    {        string fileName = "asd.txt";//客户端保存的文件名         string filePath = Server.MapPath("DownLoad/aaa.txt");//路径        FileInfo fileInfo = new FileInfo(filePath);        Response.Clear();        Response.ClearContent();        Response.ClearHeaders();        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);        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();    }      //WriteFile分块下载      protected void Button3_Click(object sender, EventArgs e)   {        string fileName = "aaa.txt";//客户端保存的文件名         string filePath = Server.MapPath("DownLoad/aaa.txt");//路径        System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);       if (fileInfo.Exists == true)       {            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));           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.Close();      }  }      //流方式下载      protected void Button4_Click(object sender, EventArgs e) {   string fileName = "aaa.txt";//客户端保存的文件名 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径//以字符流的形式下载文件   FileStream fs = new FileStream(filePath, FileMode.Open); byte[] bytes = new byte[(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();    } 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();