HttpClient通过PostAsync上传文件的奇怪行为(Weird behavior of HttpClient uploading file via PostAsync)

 我希望有人对此有解释，因为它让我疯了。 
 
 我在WinForms应用程序中有以下代码，用于将使用HttpClient的文件上载到Web API服务。 
 
ProgressMessageHandler progressMsgHandler = new ProgressMessageHandler();
progressMsgHandler.HttpSendProgress += (s, e) =>
{
   this.InvokeIfNeeded(() =>
   {
      // LOG
      this.AddLogLine("Progress: " + e.ProgressPercentage.ToString());
    });
};

using (var client = HttpClientFactory.Create(progressMsgHandler))
{ 
   using (var content = new MultipartFormDataContent())
   {
      var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
      var streamContent = new StreamContent(stream);
      content.Add(streamContent);

      var url = String.Format("{0}?src={1}", STR_URL_FILEMGMT, "IM");
      client.PostAsync(new Uri(url), content).ContinueWith(task =>
      {
        if (task.Result.IsSuccessStatusCode)
         {
            this.InvokeIfNeeded(() =>
            {
               // LOG
               this.AddLogLine("File has been uploaded OK!");
            });
         }
         else
            this.InvokeIfNeeded(() =>
            {
               // LOG
               this.AddLogLine(String.Format("Error during upload: '{0}'", task.Exception.Message));
            });                                
      });
   }
}
 
 请注意，列出的整个代码也包含在try catch中，如果有的话，将打印异常。 
 
 对我来说很奇怪的是我根本没有打印任何日志行。 既不是为了进步，也不是为了成功发布，既没有发布错误也没有发布全局尝试。 
 
 在调试期间，我看到代码正在执行，但没有遇到日志行所在的任何断点。 
 
 可能我没有正确使用HttpClient或这些任务（我是初学者在这btw）？ 有谁知道我的代码出了什么问题？ 
 
 
 更新 （从Noseratio获得解决方案后）： 
 
 可以在此处找到有助于我了解HttpClient不需要处理的额外信息 

I hope someone has an explanation to this, because it drives me nuts. 
 
I have the following code in a WinForms application to upload a file using HttpClient to a Web API service.
 
ProgressMessageHandler progressMsgHandler = new ProgressMessageHandler();
progressMsgHandler.HttpSendProgress += (s, e) =>
{
   this.InvokeIfNeeded(() =>
   {
      // LOG
      this.AddLogLine("Progress: " + e.ProgressPercentage.ToString());
    });
};

using (var client = HttpClientFactory.Create(progressMsgHandler))
{ 
   using (var content = new MultipartFormDataContent())
   {
      var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
      var streamContent = new StreamContent(stream);
      content.Add(streamContent);

      var url = String.Format("{0}?src={1}", STR_URL_FILEMGMT, "IM");
      client.PostAsync(new Uri(url), content).ContinueWith(task =>
      {
        if (task.Result.IsSuccessStatusCode)
         {
            this.InvokeIfNeeded(() =>
            {
               // LOG
               this.AddLogLine("File has been uploaded OK!");
            });
         }
         else
            this.InvokeIfNeeded(() =>
            {
               // LOG
               this.AddLogLine(String.Format("Error during upload: '{0}'", task.Exception.Message));
            });                                
      });
   }
}
 
Please note, entire code listed is also wrapped into a try catch where exception would be printed, if any.
 
Very weird to me is that I don't get any log line printed at all. Neither for progress, neither for posting with success, neither for posting with errors nor in the global try catch.
 
During debug, I see the code executing, but doesn't hit any breakpoints where the log lines are. 
 
Probably I don't use correctly HttpClient or these tasks (I am beginner at this btw)? Does anyone know what's going wrong with my code?
 
 
UPDATE (after getting the solution from Noseratio):
 
Extra information which helps me understand that HttpClient does not need to be disposed can be found here

原文：https://stackoverflow.com/questions/22211401