웹 API가 ASP.NET 응용 프로그램 내에서 호스팅되는 경우 표시 Application_Error한 테스트 작업의 예외를 포함하여 코드에서 처리되지 않은 모든 예외에 대해 이벤트가 호출됩니다. 따라서 Application_Error 이벤트 내에서이 예외를 처리하기 만하면됩니다. 샘플 코드 HttpException에서 Convert.ToInt32("a")코드 의 경우가 아닌 유형의 예외 만 처리하고 있음을 보여주었습니다 . 따라서 모든 예외를 기록하고 처리해야합니다.

protected void Application_Error()
{
    Exception unhandledException = Server.GetLastError();
    HttpException httpException = unhandledException as HttpException;
    if (httpException == null)
    {
        Exception innerException = unhandledException.InnerException;
        httpException = innerException as HttpException;
    }

    if (httpException != null)
    {
        int httpCode = httpException.GetHttpCode();
        switch (httpCode)
        {
            case (int)HttpStatusCode.Unauthorized:
                Response.Redirect("/Http/Error401");
                break;

            // TODO: don't forget that here you have many other status codes to test 
            // and handle in addition to 401.
        }
        else
        {
            // It was not an HttpException. This will be executed for your test action.
            // Here you should log and handle this case. Use the unhandledException instance here
        }
    }
}

웹 API의 예외 처리는 다양한 수준에서 수행 될 수 있습니다. 다음 detailed article은 다양한 가능성을 설명합니다.

• 글로벌 예외 필터로 등록 될 수있는 사용자 정의 예외 필터 속성

  [AttributeUsage(AttributeTargets.All)]
  public class ExceptionHandlingAttribute : ExceptionFilterAttribute
  {
      public override void OnException(HttpActionExecutedContext context)
      {
          if (context.Exception is BusinessException)
          {
              throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.InternalServerError)
              {
                  Content = new StringContent(context.Exception.Message),
                  ReasonPhrase = "Exception"
              });
          }
  
          //Log Critical errors
          Debug.WriteLine(context.Exception);
  
          throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.InternalServerError)
          {
              Content = new StringContent("An error occurred, please try again or contact the administrator."),
              ReasonPhrase = "Critical Exception"
          });
      }
  }

• 맞춤 액션 호출자

  public class MyApiControllerActionInvoker : ApiControllerActionInvoker
  {
      public override Task<HttpResponseMessage> InvokeActionAsync(HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken)
      {
          var result = base.InvokeActionAsync(actionContext, cancellationToken);
  
          if (result.Exception != null && result.Exception.GetBaseException() != null)
          {
              var baseException = result.Exception.GetBaseException();
  
              if (baseException is BusinessException)
              {
                  return Task.Run<HttpResponseMessage>(() => new HttpResponseMessage(HttpStatusCode.InternalServerError)
                  {
                      Content = new StringContent(baseException.Message),
                      ReasonPhrase = "Error"
  
                  });
              }
              else
              {
                  //Log critical error
                  Debug.WriteLine(baseException);
  
                  return Task.Run<HttpResponseMessage>(() => new HttpResponseMessage(HttpStatusCode.InternalServerError)
                  {
                      Content = new StringContent(baseException.Message),
                      ReasonPhrase = "Critical Error"
                  });
              }
          }
  
          return result;
      }
  }

답변

public static void Register(HttpConfiguration config)
{
  config.MapHttpAttributeRoutes();

  // There can be multiple exception loggers.
  // (By default, no exception loggers are registered.)
  config.Services.Add(typeof(IExceptionLogger), new ElmahExceptionLogger());

  // There must be exactly one exception handler.
  // (There is a default one that may be replaced.)
  config.Services.Replace(typeof(IExceptionHandler), new GenericTextExceptionHandler());
}

public class ElmahExceptionLogger : ExceptionLogger
{
  public override void Log(ExceptionLoggerContext context)
  {
    ...
  }
}

public class GenericTextExceptionHandler : ExceptionHandler
{
  public override void Handle(ExceptionHandlerContext context)
  {
    context.Result = new InternalServerErrorTextPlainResult(
      "An unhandled exception occurred; check the log for more information.",
      Encoding.UTF8,
      context.Request);
  }
}

public class LogExceptionFilter : ExceptionFilterAttribute
{
    private static readonly ILog log = LogManager.GetLogger(typeof (LogExceptionFilter));

    public override void OnException(HttpActionExecutedContext actionExecutedContext)
    {
        log.Error("Unhandeled Exception", actionExecutedContext.Exception);
        base.OnException(actionExecutedContext);
    }
}

[HandleError]
public class BaseController : Controller {...}