Question

如果后者未设置可选参数，如何在ASP.NET MVC 5中定义一个忽略静态前缀/后缀（如"zip-"，"-county"）的路由？

所以在这种情况下例如：

routes.Add("Search",
    new LowercaseDashedRoute(
    "search/{searchType}/{state}/{county}-county/{city}",
    new RouteValueDictionary(new {
        controller = "Home",
        action = "Search",            
        county = UrlParameter.Optional,
        city = UrlParameter.Optional }),
    new RouteValueDictionary(new { searchType = searchTypeConstraint }),
    new LowercaseDashedRouteHandler()));

如果缺少county，则网址会像/search/sale/ca/los-angeles，但不是 /search/sale/ca/-county/los-angeles

Answer 1

您可以为您的县参数设置约束，然后在没有它的情况下创建另一个路径：

routes.Add("Search",
    new LowercaseDashedRoute(
    "search/{searchType}/{state}/{county}/{city}",
    new RouteValueDictionary(new {
        controller = "Home",
        action = "Search",            
        county = UrlParameter.Optional,
        city = UrlParameter.Optional }),
    new RouteValueDictionary(new { searchType = searchTypeConstraint, county="\\S+-county" }),
    new LowercaseDashedRouteHandler()));

路线2：

routes.Add("Search",
    new LowercaseDashedRoute(
    "search/{searchType}/{state}/{city}",
    new RouteValueDictionary(new {
        controller = "Home",
        action = "Search",
        city = UrlParameter.Optional }),
    new RouteValueDictionary(new { searchType = searchTypeConstraint }),
    new LowercaseDashedRouteHandler()));

缺点是“-county”后缀将添加到参数中，但您可以在控制器中轻松处理。

Answer 2

单个路径上不可能有2个可选参数，或者将可选参数与段中的文字部分组合在一起。

但是，为了获得所需的效果，您可以添加另一个路径来处理没有县的情况（并将县删除为可选参数）。

// Matches:
//     /search/sale/ca/los-angeles-county/los-angeles
//     /search/sale/ca/los-angeles-county
routes.Add("SearchCounty",
    new LowercaseDashedRoute(
    "search/{searchType}/{state}/{county}-county/{city}",
    new RouteValueDictionary(new {
        controller = "Home",
        action = "Search",            
        city = UrlParameter.Optional }),
    new RouteValueDictionary(new { searchType = searchTypeConstraint }),
    new LowercaseDashedRouteHandler()));

// Matches:
//     /search/sale/ca/los-angeles
routes.Add("Search",
    new LowercaseDashedRoute(
    "search/{searchType}/{state}/{city}",
    new RouteValueDictionary(new {
        controller = "Home",
        action = "Search" }),
    new RouteValueDictionary(new { searchType = searchTypeConstraint }),
    new LowercaseDashedRouteHandler()));

如果将<something>-county作为第4段传入，则路由引擎将仅匹配第一条路线，因此它将能够区分该情况而不仅仅传递city参数。

ASP.NET MVC自定义可选参数

2 个答案: