.NET 推送文件到浏览器

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/// <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,(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,buffer.Length);
    Response.End();
}

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