Html.BeginRouteForm被重定向到错误的操作？

Question

我认为这是：

@using (Html.BeginRouteForm("Forums_default", new { action = "RewardPost", item = Model.PostId }, FormMethod.Post, new { @class = "reward" }))

现在，这些是我的路线：

context.MapRoute(
    "Forums_thread",
    "Forums/{action}/{category}/{item}",
    new { controller = "Forums" }
);

context.MapRoute(
    "Forums_category",
    "Forums/{category}",
    new { controller = "Forums", action = "ThreadList" }
);

context.MapRoute(
    "Forums",
    "Forums/",
    new { controller = "Forums", action = "CategoryList" }
);

context.MapRoute(
    "Forums_default",
    "Forums/{action}/{item}",
    new { controller = "Forums", action = "CategoryList", item = UrlParameter.Optional }
);

这是正在生成的表单：

<form action="/Forums/RewardPost/11" class="reward" method="post" novalidate="novalidate">...
</form>

这就是重定向我的地方：/Forums/AddPost/4

现在的问题是：这里发生了什么？我该如何解决这个问题？