ASP.NET实现推送文件到浏览器的方法

Z时代
2024-01-10
分类：综合

本文实例讲述了ASP.NET实现推送文件到浏览器的方法。分享给大家供大家参考。具体分析如下：

这里主要实现从服务器到浏览器，推送文件，提供用户下载/浏览的功能。

提示：在AJAX UpdatePanel里面将无效。如果代码从按钮单击事件中被调用，该按钮需要在 AJAX UpdatePanel的外部。

具体代码如下：


/// <summary>
/// Downloads (pushes) file to the client browser. 
/// **** NOTE **** Cannot be done from inside an AJAX UpdatePanel control.
/// </summary>
/// <param name="fullFilePath">The full file path of the file</param>
protected void DownloadFile(string fullFilePath)
{
  // Gets the File Name
  string fileName = fullFilePath.Substring(fullFilePath.LastIndexOf('\\') + 1);
  byte[] buffer;
  using (FileStream fileStream = new FileStream(fullFilePath, FileMode.Open))
  {
    int fileSize = (int)fileStream.Length;
    buffer = new byte[fileSize];
    // Read file into buffer
    fileStream.Read(buffer, 0, (int)fileSize);
  }
  Response.Clear();
  Response.Buffer = true;
  Response.BufferOutput = true;
  Response.ContentType = "application/x-download";
  Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
  Response.CacheControl = "public";
  // writes buffer to OutputStream
  Response.OutputStream.Write(buffer, 0, buffer.Length);
  Response.End();
}