文件下载之pdf疑问

最新推荐文章于 2025-07-23 15:40:38 发布

原创最新推荐文章于 2025-07-23 15:40:38 发布 · 447 阅读

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文章标签：

#buffer #exception #byte #string #path #stream

页面的图片绑定用相对路径没问题，如：

img.ImageUrl = SystemConfig.PicPath + picPath;

其中SystemConfig.PicPath是读取配置文件的信息。

然而，文件下载如pdf下载的时候绑定相对路径却出错，如：

Path = SystemConfig.pdfPath + pdfPath; //错误

转换为物理路径
Path = Request.MapPath(SystemConfig.pdfPath + pdfPath); //正确

不知是否是服务器配置文件的问题；

下载文件函数。
/// <summary>
/// 下载SamplePage.
/// </summary>
/// <param name="FilePath">文件路径</param>
protected void SamplePageFileDownLoad(string FilePath)
{
    Stream iStream = null;
    byte[] buffer = new byte[10000];
    int length;
    long dataToRead;

    if (File.Exists(FilePath))
    {
            string filename = Path.GetFileName(FilePath);

            try
            {
                using (iStream = new FileStream(FilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
                {
                    dataToRead = iStream.Length;
                    Response.ContentType = "application/octet-stream";
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);

                    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)
            {
                MyEventLog.Log.Error(ex.ToString());
                throw (ex);
            }
            finally
            {
                if (iStream != null)
                    iStream.Close();
            }
        }
    }