c＃ - HttpResponse文件下载不起作用 - ＆＃34;文件无法下载＆＃34;

Question

我尝试允许用户使用以下服务器端C＃代码下载文件：

public static HttpResponse ExportDataToUser(string settings)
        {
            string filename = "CurrentSettings.txt";
            System.IO.StringWriter sw = new System.IO.StringWriter(new StringBuilder(settings));
            //Open a memory stream that you can use to write back to the response
            byte[] byteArray = Encoding.ASCII.GetBytes(sw.ToString());
            MemoryStream s = new MemoryStream(byteArray);
            StreamReader sr = new StreamReader(s, Encoding.ASCII);
            //Write the stream back to the response
            HttpContext.Current.Response.BufferOutput = true;
            HttpContext.Current.Response.Write(sr.ReadToEnd());
            HttpContext.Current.Response.ContentType = "text/plain";
            HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=" + filename);
            HttpContext.Current.Response.Flush();
            //sr.Close();
            //sr.Dispose();
            HttpContext.Current.Response.Close();
            return HttpContext.Current.Response;
        }

当方法到达Flush行时，会出现屏幕底部的下载栏，但是当我点击Open时，系统会提示我＆＃34;文件无法访问dataType: "text/plain"。下载。＆＃34;调用此方法的客户端调用具有.getClass()。有没有人知道下载失败的原因？