问AJAX-发布文件后，文件没有下载

EN

 public void Download(byte[] file)
{

    try
    {
        MemoryStream mstream = new MemoryStream(file);
        long dataLengthToRead = mstream.Length;
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.BufferOutput = true;
        Response.ContentType = "Application/pdf"; /// if it is text or xml
        Response.AddHeader("Content-Disposition", "attachment; filename=" + "Test.pdf");
        Response.AddHeader("Content-Length", dataLengthToRead.ToString());
        mstream.WriteTo(Response.OutputStream);
        Response.Flush();
        Response.Close();
        HttpContext.Current.Response.Flush(); // Sends all currently buffered output to the client.
        HttpContext.Current.Response.SuppressContent = true;  // Gets or sets a value indicating whether to send HTTP content to the client.
        HttpContext.Current.ApplicationInstance.CompleteRequest(); // Causes ASP.NET to bypass all events and filtering in the HTTP pipeline chain of execution and directly execute the EndRequest event.
    }
    catch (Exception e)
    {

    }
}