解决.PDF文件较大时，可能导致所下载的PDF文件无法打代码,Asp.Net代码库,德仔网

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【Asp.Net】解决.PDF文件较大时，可能导致所下载的PDF文件无法打

作者:Dezai.CN / 发布于2013/6/20/ 870


	protected void Button1_Click(object sender, EventArgs e)
	 {
	 string path;
	 try
	 {
	 path = Request.PhysicalApplicationPath + "/" + Session["pdfpath"].ToString() + "/PDF/" + Session["mlmc"].ToString() + ".pdf";
	 }
	 catch (Exception)
	 {
	 return;
	 }
	 System.IO.Stream iStream = null;
	 byte[] buffer = new Byte[10000];
	 int length;
	 long dataToRead;
	 string filename = Session["mlmc"].ToString() + ".pdf";
	
	 try
	 {
	 iStream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
	 dataToRead = iStream.Length;
	 Response.Clear();
	 Response.ClearHeaders();
	 Response.ClearContent();
	 Response.ContentType = "application/pdf"; //文件类型
	 Response.AddHeader("Content-Length", dataToRead.ToString());//添加文件长度，进而显示进度
	 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));
	 while (dataToRead > 0)
	 {
	 if (Response.IsClientConnected)
	 {
	 length = iStream.Read(buffer, 0, 10000);
	 Response.OutputStream.Write(buffer, 0, length);
	 Response.Flush();
	
	 buffer = new Byte[10000];
	 dataToRead = dataToRead - length;
	 }
	 else
	 {
	 dataToRead = -1;
	 }
	 }
	
	 }
	 catch (Exception ex)
	 {
	 Response.Write("文件下载时出现错误!");
	 }
	 finally
	 {
	 if (iStream != null)
	 {
	 iStream.Close();
	 }
	 //结束响应，否则将导致网页内容被输出到文件，进而文件无法打开
	 Response.End();
	 }
	 }

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