如何在使用HttpClient.GetAsync（）时确定404响应状态

我试图确定HttpClient的GetAsync方法在使用C＃和.NET 4.5的404错误的情况下返回的response 。

目前我只能说出错误已经发生而不是错误的状态，如404或超时。

目前我的代码我的代码如下所示：

  static void Main(string[] args) { dotest("https://error.123"); Console.ReadLine(); } static async void dotest(string url) { HttpClient client = new HttpClient(); HttpResponseMessage response = new HttpResponseMessage(); try { response = await client.GetAsync(url); if (response.IsSuccessStatusCode) { Console.WriteLine(response.StatusCode.ToString()); } else { // problems handling here string msg = response.IsSuccessStatusCode.ToString(); throw new Exception(msg); } } catch (Exception e) { // .. and understanding the error here Console.WriteLine( e.ToString() ); } } 

我的问题是我无法处理exception并确定其状态以及出错的其他详细信息。

我如何正确处理exception并解释发生了什么错误？

 static async void dotest(string url) { using (HttpClient client = new HttpClient()) { HttpResponseMessage response = await client.GetAsync(url); if (response.IsSuccessStatusCode) { Console.WriteLine(response.StatusCode.ToString()); } else { // problems handling here Console.WriteLine( "Error occurred, the status code is: {0}", response.StatusCode ); } } }