Question

我有这个默认的mapRoute：

routes.MapRoute(
           name: "Default",
           url: "{controller}/{action}/{id}",
           defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
       );

以及默认情况下其他一些声控器的其他mapRoutes，

现在，我想要一个特殊控制器的mapRoute来显示网址：myDomain.com/someValue，但是当我使用它时：

routes.MapRoute(
name: "categories",
url: "{sub}",
defaults: new { controller = "cat", action = "Index" }
);

所有 url.Actions ，＆＃34;索引＆＃34; 作为 @ Url.Action（＆＃34; index＆＃）之类的操作34;，＆＃34;登录＆＃34;）不起作用，我也用过：

子= UrlParameter.Optional

和

子=＆＃34;＆＃34;

，但他们没有用，我该怎么办？

Answer 1

您的categories路由会捕获所有网址，因为它与该角色匹配。例如，您需要编写一个自定义约束类来过滤掉数据库中不匹配的sub。

public class MyCatConstraint : IRouteConstraint
{
    // suppose this is your cats list. In the real world a DB provider 
    private string[] _myCats = new[] { "cat1", "cat2", "cat3" };

    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        // return true if you found a match on your cat's list otherwise false
        // in the real world you could query from DB to match cats instead of searching from the array.  
        if(values.ContainsKey(parameterName))
        {
            return _myCats.Any(c => c == values[parameterName].ToString());
        }
        return false;
    }
}

然后将此约束添加到您的路线。

routes.MapRoute(
    name: "categories",
    url: "{sub}",
    defaults: new { controller = "cat", action = "Index" }
    ,constraints: new { sub = new MyCatConstraint() }
    );

Answer 2

山姆的答案很好，但我会反过来做。如果参数 {sub} 适用于＆＃34; someValue＆＃34;是动态的（存储在数据库中）我会创建一个排除现有控制器的约束。所以如果你打电话

domain.com/home或domain.com/contact

它会到达这些控制器，否则通过类别。例如：

public class NotEqual : IRouteConstraint
{
    private string[] _match = null;

    public NotEqual(string[] match)
    {
        _match = match;
    }

    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        foreach(var controllername in _match)
        {
            if (String.Compare(values[parameterName].ToString(), controllername, true) == 0)
                return false;
        }
        return true;
    }
}

修改后的版本：http://stephenwalther.com/archive/2008/08/07/asp-net-mvc-tip-30-create-custom-route-constraints

，您的路线将是：

        routes.MapRoute(
            name: "categories",
            url: "{sub}",
            defaults: new { controller = "cat", action = "Index" }
            , constraints: new { sub = new NotEqual(new string[] { "Contact", "Home" }) }
         );

        routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
        );

这样，无论您放置哪个与domain.com/contact或domain.com/home不同，都会重新路由到 cat 控制器

@Url.Action("Index","Contact")

应该产生：

/Contact

自定义mapRoute用于特殊控制器，并在MVC中执行此操作：http：//example.com/someValue

2 个答案: