Home > Development > Redirect to a safe location Error Action Filter in ASP.NET MVC

Redirect to a safe location Error Action Filter in ASP.NET MVC


I have an example of an error action filter on how you can move the user to a previously know safe location in mvc with the following action filter. I and an error to tempdata which you could look for in the site master to show the error.

using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
using System.Web.Routing;

namespace Learning.ActionFilters
{
    public class RedirectToRouteErrorAttribute : FilterAttribute, IExceptionFilter
    {
        public IEnumerable<string> RouteValues { get; private set; }
        public string ErrorMessage { get; private set; }

        public RedirectToRouteErrorAttribute(string errormessage, params string[] tokens)
        {
            ErrorMessage = errormessage;
            RouteValues = tokens;
        }

        public void OnException(ExceptionContext filterContext)
        {
            if (filterContext.ExceptionHandled)
                return;

            var items = from route in filterContext.RouteData.Values
                        join key in RouteValues on route.Key equals key
                        select route;

            var dict = new RouteValueDictionary(items);

            filterContext.Controller.TempData.Add("errormessage", ErrorMessage);
            filterContext.Result = new RedirectToRouteResult(dict);
            filterContext.HttpContext.Response.Clear();
            filterContext.ExceptionHandled = true;
        }
    }
}

// Here is an example of the usage
 [HttpPut]
 [ActionName("Edit")]
 [RedirectToRouteErrorAttribute("controller","action","id")]
 public virtual ActionResult EditUser(){}

You just specify which route values you want to keep so the RedirectToRouteResult work as required

Blair…

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