WebAPI框架里设置异常返回格式统一

直接上代码

     /// <summary>
     /// 消息代理处理，用来捕获这些特殊的异常信息
     /// </summary>
     public class CustomErrorMessageDelegatingHandler : DelegatingHandler
     {
         protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
         {
             return base.SendAsync(request, cancellationToken).ContinueWith<HttpResponseMessage>((responseToCompleteTask) =>
             {
                 HttpResponseMessage response = responseToCompleteTask.Result;
                 HttpError error = null;
                 if (response.TryGetContentValue<HttpError>(out error))
                 {
                     //自定义错误处理
                     //error.Message = "这个接口调用出错了";
                 }
                 if (error != null)
                 {   //这是本人创建的一个返回类
                     var resultMsg = new ResultMsg { StatusCode = (int)StatusCodeEnum.HttpUrlEror, Info =error.MessageDetail  };
                     return new HttpResponseMessage { Content = new StringContent(resultMsg.ToJson(),
                         System.Text.Encoding.GetEncoding("UTF-8"), "application/json"), StatusCode = HttpStatusCode.OK };
                 }
                 else
                 {
                     return response;
                 }
             });
         }
     }

然后就是注册该cs文件，找到Global.asax文件

         protected void Application_Start()
         {
             AreaRegistration.RegisterAllAreas();
             //FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
             //RouteConfig.RegisterRoutes(RouteTable.Routes);
             //BundleConfig.RegisterBundles(BundleTable.Bundles);
             GlobalConfiguration.Configure(WebApiConfig.Register);
             GlobalConfiguration.Configuration.Filters.Add(new ErrorHandler());
         }

最后大功告成，效果：

 {
   "StatusCode": ,
   "Info": "在控制器“StudyTask”上找不到与该请求匹配的操作。",
   "Data": null
 }