Question

晚上好，

我正在尝试提高从c＃.net应用程序中的web api获取文件的性能。 c＃应用程序使用高CPU使用率加上dosnt似乎非常快，本地1GB文件大约需要40秒。这台机器正在运行高速NVMe SSD，所以我不相信它的硬件。

请注意，以下内容正在同一台机器上进行测试。我们的生产速度很慢，但可能是由于网络或其他问题。因此，我只想检查代码库中是否有效率。

用于下载的WPF应用程序代码是：

  public async Task Test()
    {
        AppModel.StartTime = DateTime.Now;
        var sourceFile = HttpUtility.UrlEncode("e820e6d8-4544-4f17-84e3-61e90ccd7e24.zip");
        var url = $"api/UploadDownload";

        using (var client = new HttpClient())
        {
            client.BaseAddress = new Uri(AppModel.BaseUrl);

            client.DefaultRequestHeaders.Authorization =
                new AuthenticationHeaderValue("Bearer", AppModel.Token);

            using (var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead))
            using (var streamToReadFrom = await response.Content.ReadAsStreamAsync())
            {
                var fileToWriteTo = Path.GetTempFileName();
                using (Stream streamToWriteTo = File.Open(fileToWriteTo, FileMode.Create))
                {
                    await streamToReadFrom.CopyToAsync(streamToWriteTo);
                }

                AppModel.EndTime = DateTime.Now;
                var difference = AppModel.EndTime - AppModel.StartTime;
                var totalSeconds = (int) Math.Round( difference.TotalSeconds);
                AppModel.TotalSeconds = totalSeconds;

                var fileInfo = new FileInfo(fileToWriteTo);
                AppModel.TotalMbDownload = ConvertBytesToMegabytes(fileInfo.Length);
                var averageSpeed = AppModel.TotalMbDownload / totalSeconds;
                AppModel.Speed = averageSpeed;

                File.Delete(fileToWriteTo);
            }
        }
    }

api代码如下：

   [HttpGet]
    [System.Web.Http.Authorize]
    public HttpResponseMessage GetSingleFile()
    {
        var dh = new DirectoryHelper();
        var sourceDir = "";

        // var filepath = ConfigurationManager.AppSettings["UploadDownloadLocation"] + "\\" + fileName;


        HttpResponseMessage result = null;
        var filepath = sourceDir + fileName;
        var localFilePath = filepath;

        if (!File.Exists(localFilePath))
        {
            result = Request.CreateResponse(HttpStatusCode.Gone);
        }
        else
        {
            // Serve the file to the client
            result = Request.CreateResponse(HttpStatusCode.OK);
            result.Content = new StreamContent(new FileStream(localFilePath, FileMode.Open, FileAccess.Read));
            result.Content.Headers.ContentDisposition =
                new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment")
                {
                    FileName = "test.zip"
                };
        }

        return result;
    }

任何建议都会非常有用，不确定是否有更好的方法可以提高性能。

由于

Web APi快速下载c＃

0 个答案: