如何在 MVC 5 中使用异常过滤器 [英] How to use Exception filters in MVC 5

问题描述

我如何在 MVC5 中实现异常过滤器.

How i can implement Exception Filters in MVC5.

我想向 NLog 抛出异常并将页面重定向到显示出现问题"的默认错误页面

I want to throw the exception to NLog and redirect the page to a default error page which displays "Something is gone wrong"

我有一个过滤器类，如下

I have a Filter class as follows

using System;
using System.Diagnostics;
using System.Security.Policy;
using System.Web.Mvc;
using System.Web.Mvc.Filters;
using System.Web.Routing;
using System.Web.UI.WebControls;
using Delivros.UI.Controllers;
using Delivros.UI.Areas.User.ViewModel;
using System.Web;

namespace Delivros.UI.Filters
{

public class CustomAuthenticationFilter : IAuthenticationFilter
{
    public void OnAuthentication(AuthenticationContext filterContext)
    {

    }

    public void OnAuthenticationChallenge(AuthenticationChallengeContext filterContext)
    {
        Debug.WriteLine("OnAuthenticationChallenge : MyAuthenticationFilter");
    }
}
 [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class MyAuthorizationFilter : AuthorizeAttribute
{
     public override void OnAuthorization(AuthorizationContext filterContext)
    {
        if (filterContext.RequestContext.HttpContext.Request.Cookies[System.Configuration.ConfigurationManager.AppSettings[Convert.ToString(CookieField.cookieName)]] == null)
        {

        }
        else
{
            filterContext.Result = new RedirectToRouteResult(
            new RouteValueDictionary 
    {
                { "controller", "User" }, 
                { "action", "UserRegistration" } ,
                {"Area","User"}
            });

        }
    }
}
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class CustomActionFilter : ActionFilterAttribute
{
    public override void OnResultExecuted(ResultExecutedContext filterContext)
    {
        filterContext.HttpContext.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
        filterContext.HttpContext.Response.Cache.SetValidUntilExpires(false);
        filterContext.HttpContext.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
        filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
        filterContext.HttpContext.Response.Cache.SetNoStore();
        base.OnResultExecuted(filterContext);
        filterContext.Result = new RedirectToRouteResult(
              new RouteValueDictionary 
            { 
                { "controller", "User" }, 
                { "action", "UserRegistration" } ,
                {"Area","User"}
            });
        // ActionResult home = new HomeController().Index();           
    }
}

public class MyResultFilter : IResultFilter
{
    public void OnResultExecuting(ResultExecutingContext filterContext)
    {

    }

    public void OnResultExecuted(ResultExecutedContext filterContext)
    {

    }
}

public class MyExceptionFilter : IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        filterContext.Result = new RedirectToRouteResult(
              new RouteValueDictionary 
            { 
                { "controller", "User" }, 
                { "action", "UserLogOut" } ,
                {"Area","User"}
            });

    }
}

}

但是没有重定向到页面...

But nothing is redirecting to the page...

推荐答案

您可以派生自己的 处理错误属性

public class NLogExceptionHandlerAttribute : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        // log error to NLog
        base.OnException(filterContext);
    }
}

然后全局注册

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new NLogExceptionHandlerAttribute());
    ...
}

默认情况下，HandleErrorAttribute 将显示位于 ~/Views/Shared 文件夹中的 Error 视图，但如果您想显示一个具体视图可以设置View属性的属性.

By default, the HandleErrorAttribute will display the Error view located in the ~/Views/Shared folder but if you wanted to display a specific view you can set the View property of the attribute.

这篇关于如何在 MVC 5 中使用异常过滤器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！