路由的要求不是空参数到控制器 [英] Routing to controller with Required not empty parameter

问题描述

我沃尔德样，来图的http：//本地主机/ GUID的推移，这里 ResellerController <该控制器/ code>和消防首页动作只有当 GUID的推移，这里为不为空 GUID。我的路由表看起来如下：

 公共静态无效的RegisterRoutes（RouteCollection路线）
    {
        routes.IgnoreRoute（{}资源个.axd / {*} PATHINFO）;        routes.MapRoute（
            经销商，
            {ID}，
            新{控制器=经销商，行动=索引，ID = Guid.Empty}
       //我们可以标记参数UrlParameter.Optional，但如何让需要它？
            ）;        routes.MapRoute（
            默认，//路线名称
            {控制器} / {行动} / {ID}，// URL带参数
            新{控制器=家，行动=索引，ID = UrlParameter.Optional} //参数默认
        ）;    }
 

和我的行动看起来像这样：

 公众的ActionResult指数（GUID ID）
{
    //做一些东西在这里
}
 

但经过应用程序启动（与的http：//本地主机）重定向我 ResellerController 空GUID作为 ID 参数。

解决方案

 公共静态无效的RegisterRoutes（RouteCollection路线）
{
    routes.IgnoreRoute（{}资源个.axd / {*} PATHINFO）;    routes.MapRoute（
        经销商，
        {ID}，
        新{控制器=经销商，行动=索引，ID = UrlParameter.Optional}，
        新{ID = @\"^(\\{{0,1}([0-9a-fA-F]){8}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){12}\\}{0,1})$\" }
    ）;    routes.MapRoute（
        默认，//路线名称
        {控制器} / {行动} / {ID}，// URL带参数
        新{控制器=家，行动=索引，ID = UrlParameter.Optional} //参数默认
    ）;
}
 

或者如果你想要一个更强大的约束比一些神秘的正则表达式：

 公共类GuidConstraint：IRouteConstraint
{
    公共BOOL匹配（HttpContextBase HttpContext的，路由路径，字符串参数名称，RouteValueDictionary价值，RouteDirection routeDirection）
    {
        VAR值=值[参数名称]作为字符串;
        GUID GUID;
        如果（string.IsNullOrEmpty（值）及！＆安培; Guid.TryParse（价值，走出GUID））
        {
            返回true;
        }
        返回false;
    }
}
 

和则：

  routes.MapRoute（
    经销商，
    {ID}，
    新{控制器=经销商，行动=索引，ID = UrlParameter.Optional}，
    新{ID =新GuidConstraint（）}
）;
 

I wold like to map http://localhost/Guid-goes-here to ResellerController and fire Index action of that controller only when Guid-goes-here is not empty Guid. My routing table looks as follow:

public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Reseller",
            "{id}",
            new { controller = "Reseller", action = "Index", id = Guid.Empty }  
       //We can mark parameters as UrlParameter.Optional, but how to make it required?
            );

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

    }

And my action looks like this:

public ActionResult Index(Guid id)
{
    // do some stuff here
}

But after application is started (with http://localhost) it redirects me to ResellerController with empty Guid as id parameter.

解决方案

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute(
        "Reseller",
        "{id}",
        new { controller = "Reseller", action = "Index", id = UrlParameter.Optional },
        new { id = @"^(\{{0,1}([0-9a-fA-F]){8}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){4}-([0-9a-fA-F]){12}\}{0,1})$" }
    );

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

or if you want a more robust constraint than some cryptic regex:

public class GuidConstraint : IRouteConstraint
{
    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        var value = values[parameterName] as string;
        Guid guid;
        if (!string.IsNullOrEmpty(value) && Guid.TryParse(value, out guid))
        {
            return true;
        }
        return false;
    }
}

and then:

routes.MapRoute(
    "Reseller",
    "{id}",
    new { controller = "Reseller", action = "Index", id = UrlParameter.Optional },
    new { id = new GuidConstraint() }
);

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