从Azure DevOps流水线下载的Zip文件为空问题求助

尝试从Azure DevOps流水线下载Zip格式的制品，参考相关实现后接近完成，但遇到问题：下载后的Zip文件用Windows资源管理器或其他工具解压时显示为空。已确认制品本身和下载URL有效——断点调试验证URL与Web UI获取的一致，推测是下载或创建Zip文件的代码存在问题，相关代码如下：

static private async Task DownloadArtifactWithHttpClient(string artifactDownloadUrl, string artifactName, string downloadPath)
{
    try
    {
        var localZipFilePath = downloadPath + $"\\{artifactName}.zip";

        // Use HttpClient to download the artifact
        using (var tempClient = new HttpClient())
        {
            // Send request to the DownloadUrl specificed in the BuildArtifact
            HttpResponseMessage response = await tempClient.GetAsync(artifactDownloadUrl);

            if (!response.IsSuccessStatusCode)
            {
                // Something went wrong, shouldn't happen
                throw new Exception($"Error downloading artifact: {response.StatusCode}:{response.ReasonPhrase}");
            }

            // Save the stream to a file
            using (Stream zipFile = File.Create(localZipFilePath))
            {
                await response.Content.CopyToAsync(zipFile);
            }
        }

        // All done!
        Console.WriteLine($"Done downloading too, {localZipFilePath}");
    }
    catch (Exception ex)
    {
        Console.WriteLine("Exception: " + ex.Message);
        if (ex.InnerException != null) Console.WriteLine("Detailed Info: " + ex.InnerException.Message);
        Console.WriteLine("Stack:\n" + ex.StackTrace);
    }
    
}

• 添加Azure DevOps认证头：Azure DevOps的制品下载URL需要身份验证，直接请求可能返回空白内容（状态码仍为200）。需在HttpClient中添加认证头，比如使用个人访问令牌（PAT）：

  var pat = "你的PAT令牌";
  tempClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", 
      Convert.ToBase64String(Encoding.ASCII.GetBytes($":{pat}")));
  

• 修复路径拼接问题：直接用字符串拼接路径可能导致格式错误，改用Path.Combine确保路径正确：

  var localZipFilePath = Path.Combine(downloadPath, $"{artifactName}.zip");
  

• 验证下载内容长度：添加日志检查实际下载的字节数，确认是否真的获取到内容：

  if (response.Content.Headers.ContentLength.HasValue)
  {
      Console.WriteLine($"预期下载字节数：{response.Content.Headers.ContentLength.Value}");
  }
  var stream = await response.Content.ReadAsStreamAsync();
  Console.WriteLine($"实际读取字节数：{stream.Length}");
  

• 确保流正确刷新：在CopyToAsync后手动刷新流，避免数据未完全写入文件：

  await response.Content.CopyToAsync(zipFile);
  await zipFile.FlushAsync();
  

内容的提问来源于stack exchange，提问作者j3270