C# HttpClient.PostAsync崩溃应用程序。如何捕获异常？

我正在尝试测试此HttpRequest：

 public void TestX(string baseUrl)
        {
            StringContent httpContentDistanza = new StringContent(GlobalVariables.JsonDistanza);
            using HttpClient httpClient = new HttpClient
            {
                BaseAddress = new Uri(baseUrl)
            };

            HttpResponseMessage responseMessage = null;

            try
            {
                responseMessage = httpClient.PostAsync("/xxx/xx/xxx", httpContentDistanza).Result;
              // can't reach the code below
                if (responseMessage.IsSuccessStatusCode)
                {
                    string strContext = responseMessage.Content.ReadAsStringAsync().Result;

                    var risultato = JsonSerializer.Deserialize<Distanza1>(strContext);

                    GlobalVariables.DblAijCrnPsz = risultato.data.processDataIn.valore;
                }
            }
            catch (Exception ex)
            {
                if (responseMessage == null)
                {
                    responseMessage = new HttpResponseMessage();
                }
                responseMessage.StatusCode = HttpStatusCode.InternalServerError;
                responseMessage.ReasonPhrase = string.Format("RestHttpClient.SendRequest failed: {0}", ex);
            
            }
        }

更新

我不知道我做错了什么。。我仍然无法捕获异常：

     public async Task TestX(string baseUrl)
            {
              StringContent httpContentDistanza = new  StringContent(GlobalVariables.JsonDistanza);

              using HttpClient httpClient = new HttpClient
               {
                  BaseAddress = new Uri(baseUrl)
               };
        
               HttpResponseMessage responseMessage = null;
             
                try
                {
                    responseMessage = await client.PostAsync("/xxx/xxx/xx", httpContentDistanza);
    
                    if (responseMessage.IsSuccessStatusCode)
                    {
                        string strContext = await responseMessage.Content.ReadAsStringAsync();
    
                     var risultato = JsonSerializer.Deserialize<Distanza1>(strContext);

                    }
                }
                catch(Exception ex)
                {
                    var error = ex.Message;
                }

它在此处崩溃responseMessage=wait httpClient.PostAsync/xxx/xx/xxx，httpContentDistanza；但在ResetAll和var x=中停止

我以前见过和读过类似的问题，但没有解决办法。

---

有没有关于如何捕获异常的建议？

您应该更改以下内容：

public void TestX(string baseUrl) 

到

还有这个

responseMessage = httpClient.PostAsync("/xxx/xx/xxx",httpContentDistanza).Result;

到

---

然后你可以处理异常。

也许可以检查一下你从POST得到的结果？如果它是一个未知的子网站，您将获得404 HttpCode。也许是那个帮助秀？在ponseMessage=httpClient.PostAsync/xxx/xx/xxx之后，是httpContentDistanza.Result；它会崩溃，并且不会到达您在同步上下文中调用的任何代码行和异步方法。所以基本上PostAsync不会阻塞并在另一个线程上下文上运行。您需要做的是将异步调用放在异步方法中，并用await修饰调用，或者为HttpClient使用同步重载。PostBtw，调用和响应必须是即时的，这就是为什么我不想使用Async和await。是什么让您认为async/await使它不那么即时？您不妨尝试一下async/Wait，它不会比您现在的速度慢；一开始我就这么做过。都一样。我只是更新了我的问题

public async Task TestX(string baseUrl)

responseMessage = httpClient.PostAsync("/xxx/xx/xxx",httpContentDistanza).Result;

responseMessage = await httpClient.PostAsync("/xxx/xx/xxx", httpContentDistanza);