MVC RESTFUL HTTPClient 尝试捕获异常

Question

我有点困惑为什么我的 try...catch 异常似乎无法正常工作。我设置了以下工作正常的代码 - 调用 WCF 静态服务。我决定通过关闭 WCF Restful 服务来测试它，希望它会捕获错误消息或忽略 200(ok) 消息等，但由于某种原因..try catch 和 response.EnsureStatusIsSuccessful() 似乎被忽略，从而生成try catch 中间出现 HttpStageProcessingException 错误。

据我了解，当忽略 200 时，我应该只需要捕获 ArgumentOutOfRangeException...想法？

        // set up passing parameters
        var p = new HttpQueryString();
        p.Add("username", username);
        p.Add("password", password);

        try
        {
            WebConfigurations cfg = new WebConfigurations();
            HttpResponseMessage response;

            // cfg - gets the base address for the URL of the WCF
            using (HttpClient client = new HttpClient(cfg.GetBaseUrl()))
            {
                // exception HttpStageProcessingException occurs here...
                response = client.Get(new Uri(client.BaseAddress + "MainService/ValidateUser"), p);
                response.EnsureStatusIsSuccessful();

                string memberallowed = string.Empty;

                // process the resonse xml etc..NOT a problem...
                ProcessStreamData proc = new ProcessStreamData();
                memberallowed = proc.ReadStreamData(response);

                // blah balh
                return result;
            }

        }

        catch (ArgumentOutOfRangeException aorEx)
        {

            Console.Write("Argument Out of Range: " + aorEx.Message);
            return false;

        }
        // This really should not be here??? No error message is generated, too...
        catch (HttpStageProcessingException timeEx)
        {
            Console.Write("Stage Processing" + timeEx.Message);
            return false;

        }
        catch (Exception ex)
        {
            Console.Write("Standard error" + ex.Message);
            return false;
        }

Answer 1

在告诉 Visual Studio 不要因抛出的异常而中断后，您是否尝试过执行此操作？从菜单中，“调试”->“调试”然后取消选中抛出异常。

另外，您可能想从 Rest Starter Kit 中转储该版本的 HttpClient。最新版本可以在这里找到 http://nuget.org/List/Packages/HttpClient 和请注意，有重大变化。