Question

RedirectToAction受到保护，我们只能在操作中使用它。但是，如果我想在过滤器中重定向？

public class IsGuestAttribute: ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (!Ctx.User.IsGuest) 
            filterContext.Result = (filterContext.Controller as Controller)
                .RedirectToAction("Index", "Home");
    }
}

Answer 1

RedirectToAction只是构建RedirectToRouteResult()的辅助方法，因此您只需创建一个新RedirectToRouteResult()传递RouteValueDictionary()，其中包含您的操作值。

根据以下评论中来自@Domenic的代码完成示例：

public class IsGuestAttribute: ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (!Ctx.User.IsGuest) 
        {
            filterContext.Result = new RedirectToRouteResult(
                new RouteValueDictionary 
                { 
                    { "controller", "Home" }, 
                    { "action", "Index" } 
                });
        }
    }
}

Answer 2

这是一个代码示例：

public override void OnActionExecuting(ActionExecutingContext filterContext)
{

    if (!Ctx.User.IsGuest)
    {
        RouteValueDictionary redirectTargetDictionary = new RouteValueDictionary();
        redirectTargetDictionary.Add("action", "Index");
        redirectTargetDictionary.Add("controller", "Home");

        filterContext.Result = new RedirectToRouteResult(redirectTargetDictionary);
    }
}

Answer 3

我知道我在聚会上有点迟到了，但是我使用了veggerby的解决方案并构建了一个对某些人有用的帮助类，所以我想在这里提供它：

public static class ActionFilterHelpers
{
    public static void Redirect(this ActionExecutingContext filterContext, String controller, String action, object routeValues)
    {
        filterContext.Result = Redirect(controller, action, routeValues);
    }

    public static ActionResult Redirect(String controller, String action, object routeValues)
    {
        var routeValues = new RouteValueDictionary();

        routeValues["controller"] = controller;
        routeValues["action"] = action;

        foreach (var keyValue in new ObjectDictionary(routeValues))
            routeValues.Add(keyValue.Key, keyValue.Value);

        return new RedirectToRouteResult(routeValues);
    }
}

我提供了一个返回重定向ActionResult的静态方法和一个扩展filterContext的扩展方法。希望有人觉得这很有用。

ObjectDictionary是一个使用反射从构造它的对象的属性创建字典的类。我没有包含该代码，因为我相信在框架中的某个地方有更好的方法。我还没有找到它，但我不希望别人继承我潜在的错误。

Answer 4

安全/授权/身份验证过滤器应使用AuthorizeAttribute和IAuthorizationFilter。

public class IsGuestAttribute: AuthorizeAttribute, IAuthorizationFilter
{
    public void OnResultExecuted(ResultExecutedContext filterContext)
    {
    }
    public void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (!Ctx.User.IsGuest) 
        {
            filterContext.Result = new RedirectToRouteResult(
                new RouteValueDictionary 
                { 
                    { "controller", "Home" }, 
                    { "action", "Index" } 
                });
        }
    }
}

Answer 5

用法： filterContext.RedirectToAction("Login", "Account");

这是我编写的一个帮助器类，其中编写了一些扩展方法，以便在更多地方提供RedirectToAction功能。这对于OP来说已经太晚了，但希望它对某人有所帮助！

public static class RedirectHelper
{
    // RedirectToAction Extension Methods
    public static void RedirectToAction(this HttpResponseBase response, String action, String controller, object routeValues = null, bool endResponse = false)
    {
        response.RedirectToRoute(CreateRoute(action, controller, routeValues));
        if (endResponse) response.End();
    }
    public static void RedirectToAction(this HttpResponse response, String action, String controller, object routeValues = null, bool endResponse = false)
    {
        response.RedirectToRoute(CreateRoute(action, controller, routeValues));
        if (endResponse) response.End();
    }
    public static void RedirectToAction(this ActionExecutingContext filterContext, String action, String controller, object routeValues = null, bool endResponse = false)
    {
        if (endResponse) filterContext.HttpContext.Response.RedirectToAction(action, controller, routeValues, true);
        else filterContext.Result = new RedirectToRouteResult(CreateRoute(action, controller, routeValues));
    }
    public static void RedirectToAction(this ExceptionContext filterContext, String action, String controller, object routeValues = null, bool endResponse = false)
    {
        if (endResponse) filterContext.HttpContext.Response.RedirectToAction(action, controller, routeValues, true);
        else {
            filterContext.ExceptionHandled = true;
            filterContext.Result = new RedirectToRouteResult(CreateRoute(action, controller, routeValues));
        }
    }
    // Route Value Derivation
    public static RouteValueDictionary CreateRoute(String action, String controller, object routeValues = null)
    {
        RouteValueDictionary result = routeValues != null ? 
            HtmlHelper.AnonymousObjectToHtmlAttributes(routeValues) : 
            new RouteValueDictionary();
        result["controller"] = controller;
        result["action"] = action;
        return result;
    }
}

还有更多未包含的ControllerContexts，但根据您的需要添加自己的ControllerContexts应该相当容易。

如何让过滤器重定向到另一个动作？

5 个答案: