Question

如果我在我看来这样做

<% Html.RenderAction("RenderAdminMenu", "Shared"); %>

然后在控制器操作RenderAdminMenu中使用它：

RouteData rd = route.GetRouteData(Url.RequestContext.HttpContext);

或

RouteData rd = route.GetRouteData(this.HttpContext);

然后返回的RouteData（rd）始终为空。

怎么回事？

Answer 1

尝试使用HttpContext.Current代替Url.RequestContext.HttpContext，我不确定这是否是问题。

由于

Answer 2

1）访问有关当前路线的信息：

    RouteValueDictionary values = Url.RequestContext.RouteData.Values;

然后通过这样的值：

    foreach (KeyValuePair<string, object> pair in values)
    {
        if (pair.Key.Equals("slug", StringComparison.InvariantCultureIgnoreCase))

2）但是，如果我们需要访问整个路径集合，枚举它们或者只是做我们想要的任何事情（比如从我的路线构建导航菜单，我这样做）我们这样做：

    <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<%@ Import Namespace="pending.MVC" %>
<% if (RouteTable.Routes.Count > 0 && Request.IsAuthenticated)
   { %>
<div id="AdminMenu">
    <ul>
        <%
            foreach (NamedTypedRoute r in RouteTable.Routes)
            {
                if (r.Type == RouteType.Admin)
                {
                    // check if current view is opened in modal mode; if so, correct the admin menu links so 
                    // they open (remain) modal too
                    bool modal = false;
                    string append = string.Empty;
                    if (Request.QueryString["modal"] != null)
                        modal = bool.Parse(Request.QueryString["modal"]);

                    if (modal)
                        append = "?modal=true";
%>
        <li><a href="<%=Url.RouteUrl(r.Name) + append%>"><%=r.Name%></a></li>
        <%
                }
            }
        %></ul>
</div>
<% } %>

为此，您还需要一个特殊的NamedTypedRoute类：

public class NamedTypedRoute : Route
{
    private string _name;

    public RouteType Type { get; set; }

    public NamedTypedRoute(string name, RouteType type, string url, IRouteHandler routeHandler)
        : base(url, routeHandler)
    {
        _name = name;
        Type = type;
    }

    public NamedTypedRoute(string name, RouteType type, string url, RouteValueDictionary defaults,
                           RouteValueDictionary constraints, IRouteHandler routeHandler)
        : base(url, defaults, constraints, routeHandler)
    {
        _name = name;
        Type = type;
    }

    public NamedTypedRoute(string name, RouteType type, string url, RouteValueDictionary defaults,
                           RouteValueDictionary constraints, RouteValueDictionary dataTokens, IRouteHandler routeHandler)
        : base(url, defaults, constraints, dataTokens, routeHandler)
    {
        _name = name;
        Type = type;
    }

    public string Name
    {
        get { return _name; }
    }
}

ASP.NET MVC中的RenderAction不发送RequestContext / HttpContext？

2 个答案: