asp.net-mvc 在asp.net mvc 动作过滤器中重定向到指定的控制器和动作
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Redirecting to specified controller and action in asp.net mvc action filter
提问by Nick Larsen
I have written an action filter which detects a new session and attempts to redirect the user to a page informing them that this has happened. The only problem is I can not figure out how to make it redirect to a controller/action combo in an action filter. I can instead only figure out how to redirect to a specified url. Is there a direct way to redirect to a controller/action combo in an action filter in mvc2?
我编写了一个动作过滤器，它检测新会话并尝试将用户重定向到一个页面，通知他们发生了这种情况。唯一的问题是我不知道如何让它重定向到动作过滤器中的控制器/动作组合。我只能弄清楚如何重定向到指定的 url。有没有直接的方法可以重定向到 mvc2 中动作过滤器中的控制器/动作组合？
回答by Richard Garside
Rather than getting a reference to HttpContent and redirecting directly in the ActionFilter you can set the Result of the filter context to be a RedirectToRouteResult. It's a bit cleaner and better for testing.
您可以将过滤器上下文的 Result 设置为 RedirectToRouteResult，而不是获取对 HttpContent 的引用并直接在 ActionFilter 中重定向。它更干净，更适合测试。
Like this:
像这样：
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if(something)
{
filterContext.Result = new RedirectToRouteResult(
new RouteValueDictionary {{ "Controller", "YourController" },
{ "Action", "YourAction" } });
}
base.OnActionExecuting(filterContext);
}
回答by Nick Larsen
EDIT: The original question was about how to detect session logout, and then automatically redirect to a specified controller and action. The question proved much more useful as it's current form however.
编辑：最初的问题是关于如何检测会话注销，然后自动重定向到指定的控制器和操作。然而，这个问题被证明更有用，因为它是当前的形式。
I ended up using a combination of items to achieve this goal.
我最终使用了项目的组合来实现这个目标。
First is the session expire filter found here. Then I wanted someway to specify the controller/action combo to get a redirect URL, which I found plenty of examples of here. In the end I came up with this:
首先是在此处找到的会话过期过滤器。然后我想以某种方式指定控制器/操作组合以获取重定向 URL，我在这里找到了很多示例。最后我想出了这个：
public class SessionExpireFilterAttribute : ActionFilterAttribute
{
public String RedirectController { get; set; }
public String RedirectAction { get; set; }
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
HttpContext ctx = HttpContext.Current;
if (ctx.Session != null)
{
if (ctx.Session.IsNewSession)
{
string sessionCookie = ctx.Request.Headers["Cookie"];
if ((null != sessionCookie) && (sessionCookie.IndexOf("ASP.NET_SessionId") >= 0))
{
UrlHelper helper = new UrlHelper(filterContext.RequestContext);
String url = helper.Action(this.RedirectAction, this.RedirectController);
ctx.Response.Redirect(url);
}
}
}
base.OnActionExecuting(filterContext);
}
}
回答by Robert Harvey
Call RedirectToActionusing this overload:
使用此重载调用RedirectToAction：
protected internal RedirectToRouteResult RedirectToAction(
string actionName,
RouteValueDictionary routeValues
)
In Action Filters, the story is a little different. For a good example, see here:
在动作过滤器中，故事有点不同。有关一个很好的示例，请参见此处：
http://www.dotnetspider.com/resources/29440-ASP-NET-MVC-Action-filters.aspx
http://www.dotnetspider.com/resources/29440-ASP-NET-MVC-Action-filters.aspx
