CSV下载的最后一行缺少

Question

我正在使用HttpResponse.BinaryWrite创建下载csv文件。但是我总是在下载的csv中缺少最后一行。下面我提到了我的代码。我尝试在StreamWriter中添加bufferSize，但似乎没有任何效果。我无法解决问题所在。

    public void GetDetailReprot(string groupCode, List<CustomCodeReport> userResponse)
            {
                using (MemoryStream memoryStream = new MemoryStream())
                {

                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ContentType = "text/csv";
                HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
                HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + groupCode + "." + CommonConstant.CsvFormat);
                HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
                HttpContext.Current.Response.BufferOutput = true;

                using (var writer = new StreamWriter(memoryStream, Encoding.UTF8))
                {
                    int count = 0;
                    writer.WriteLine("TestTakerIdentifier,TestTakerName,Block Name,Item Name,Stimulus,PsuedoWord,UserAnswer,Score");
                    if (userResponse!= null)
                    {
                        foreach (var itemResponse in userResponse)
                        {


                            writer.WriteLine("=\"" + itemResponse.TesrTakerId + "\","
                                             + itemResponse.UserName + ","
                                             + itemResponse.BlockName + ","
                                             + itemResponse.ItemName + ","
                                             + itemResponse.ItemStimulus + ","
                                             + itemResponse.Score);

                            count++;
                        }

                        HttpContext.Current.Response.BinaryWrite(memoryStream.ToArray());
                        HttpContext.Current.Response.End();

                    }
                }
            }

请帮助！

PS：我尝试使用writer.Flush()，但仍无效。并且，userResponse列表是否有100行或500行或1000行，我只丢失了下载的4-5行。那么这个缓冲区如何影响这里？

  

StreamWriter此处使用的缓冲区总是只比几个字节少   我需要什么？