全局异常过滤器或Application_Error都不是捕获未处理的异常

Question

我有一个名为的全局异常过滤器LogErrorAttribute:

public class LogErrorAttribute : IExceptionFilter
{
    private ILogUtils logUtils;

    public void OnException(ExceptionContext filterContext)
    {
        if (this.logUtils == null)
        {
            this.logUtils = StructureMapConfig.Container.GetInstance<ILogUtils>();
        }

        this.logUtils.LogError(HttpContext.Current.User.Identity.GetUserId(), "Unknown error.", filterContext.Exception);
    }
}

它与标准HandleErrorAttribute过滤器一起注册:

filters.Add(new LogErrorAttribute());
filters.Add(new HandleErrorAttribute());

我正在注册这样的过滤器:

FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

我也有一个Application_Error后备:

protected void Application_Error()
{
    var exception = Server.GetLastError();
    Server.ClearError();
    var httpException = exception as HttpException;

    //Logging goes here

    var routeData = new RouteData();
    routeData.Values["controller"] = "Error";
    routeData.Values["action"] = "Index";

    if (httpException != null)
    {
        if (httpException.GetHttpCode() == 404)
        {
            routeData.Values["action"] = "NotFound";
        }
        Response.StatusCode = httpException.GetHttpCode();
    }
    else
    {
        Response.StatusCode = 500;
    }

    // Avoid IIS7 getting involved
    Response.TrySkipIisCustomErrors = true;

    // Execute the error controller
    if (exception != null)
    {
        this.errorLogger.Log(LogLevel.Error, "An unknown exception has occurred.", exception);
    }
    else if (httpException != null)
    {
        this.errorLogger.Log(LogLevel.Error, "An unknown HTTP exception has occurred.", httpException);
    }
    else
    {
        this.errorLogger.Log(LogLevel.Error, "An unknown error has occurred.");
    }
}

现在,我有一个API控制器,它从数据库中获取一些数据,然后用于AutoMapper映射模型以查看模型:

var viewModels = AutoMapper.Mapper.Map(users, new List<UserViewModel>());

在该AutoMapper配置中,为其中一个属性执行自定义解析程序:

var appModuleAssignments = this.appModuleAssignmentManager.Get(userId);
var appModules = appModuleAssignments.Select(x => this.appModuleManager.Get(x.AppModuleId));
return AutoMapper.Mapper.Map(appModules, new List<AppModuleViewModel>());

目前我正在强制appModuleManager.Get声明抛出常规异常:

throw new Exception("Testing global filter.");

这随后抛出异常AutoMapper,两者都未处理,但全局过滤器或Application_Error正在拾取此异常.

我在这做错了什么？

---

自发布以来我做过的几件事情:

1. 添加customErrors属性Web.config以转动它们on.
2. 删除了HandleErrorAttribute全局过滤器,因为我意识到它正在设置错误,如果它甚至正在运行.我不希望它仍然在执行,因为这个错误发生在控制器外部,但它可能会在稍后发生.

Answer 1

简短的回答是您要添加MVC异常过滤器而不是Web API异常过滤器.

您的实施检查ExceptionContext而不是HttpActionExecutedContext

public override void OnException(HttpActionExecutedContext actionExecutedContext)

由于框架将引发Http异常而不是MVC异常,OnException因此不会触发覆盖方法.

所以,一个更完整的例子:

public class CustomExceptionFilter : ExceptionFilterAttribute

    {
       public override void OnException(HttpActionExecutedContext actionExecutedContext)

      {

        message = "Web API Error";
        status = HttpStatusCode.InternalServerError;

        actionExecutedContext.Response = new HttpResponseMessage()
        {
            Content = new StringContent(message, System.Text.Encoding.UTF8, "text/plain"),
            StatusCode = status
        };

        base.OnException(actionExecutedContext);
    }
}

另一个重要步骤是在Register(HttpConfiguration config)方法中的WebApiConfig.cs中注册Global Web API异常过滤器.

public static void Register(HttpConfiguration config)
{

...

config.Filters.Add(new CustomExceptionFilter());

}