MVC 4全局异常过滤器如何实现？

Question

我如何在MVC4中实现全局异常处理程序,因为它似乎与MVC3不同.

不确定如何实现以下内容:

public class ErrorHandlerAttribute: System.Web.Mvc.FilterAttribute, 
                                    IExceptionFilter
{
    public Task ExecuteExceptionFilterAsync(
            HttpActionExecutedContext actionExecutedContext, 
            CancellationToken cancellationToken)
    {
        throw new NotImplementedException();
    }
}

Answer 1

不幸的是,Eric Leschinski的commet中提供的链接仅显示了如何实现System.Web.Mvc.IExceptionFilter接口,而不是System.Web.Http.Filters.IExceptionFilter接口.第一个用于常规MVC控制器,而第二个用于ApiCotrollers.

下面是一个简单的类示例,用于记录在我的ApiControllers中抛出的未处理的异常:

public class ExceptionLoggerFilter: IExceptionFilter
{
    public ExceptionLoggerFilter(Logger logger)
    {
        this.logger = logger;
    }

    public bool AllowMultiple { get { return true; } }

    public Task ExecuteExceptionFilterAsync(
            HttpActionExecutedContext actionExecutedContext,
            CancellationToken cancellationToken)
    {
        return Task.Factory.StartNew(() =>
        {
            logger.Error("web service error", actionExecutedContext.Exception);
        }, cancellationToken);
    }

    private Logger logger;
}

要启用此过滤器,您只需将其注册到您的Global.asax Application_Start方法中:

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();

    // allocate filter and add it to global configuration
    var exceptionLogger = new ExceptionLoggerFilter(Container.Get<Logger>());
    GlobalConfiguration.Configuration.Filters.Add(exceptionLogger);

    WebApiConfig.Register(GlobalConfiguration.Configuration);
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
}

我希望这有助于其他googlers在那里!

Answer 2

我为MVC创建了异常处理程序的一部分,我创建了一个实现了IExceptionFilter的类

public class MVCExceptionFilter : IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        Trace.TraceError(filterContext.Exception.ToString());
    }
}

然后在Global.asax.cs里面注册它 protected void Application_Start()

该方法已包含该行

FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

所以,你将需要添加这条线以上就

GlobalFilters.Filters.Add(new MVCExceptionFilter());