Asp.net mvc 我可以使用MVC路由限制页码吗？

我的URL如下所示：

/category/page-#

/tag/product/page-#

......

routes.MapRoute(
  name: "limitPaging",
  url: "*/page-{pageNumber}",
  defaults: new { controller = "Error", action = "P404", }, 
            new { pageNumber = @"\d+" }, 
            new { pageNumber > 200 }
);

public class LessThanPage : IRouteConstraint
    {
        private int _maxPage;

        public LessThanPage(int maxPage)
        {
            _maxPage = maxPage;
        }

        public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {
            return httpContext.Request.RawUrl.ToLower().Contains("/page-") && GetPageNumberFromURL(httpContext.Request.RawUrl.ToLower()) > _maxPage;
        }

        private int GetPageNumberFromURL(string url)
        {
            var pageNumber = 1;
            var iIndexOfPage = url.IndexOf("/page-");
            var iIndexOfHash = url.IndexOf('#') > -1 ? url.IndexOf('#') : url.Length;
            if (iIndexOfPage >= 0 && iIndexOfHash - iIndexOfPage > 0)
                pageNumber = int.Parse(url.Substring(iIndexOfPage, iIndexOfHash - iIndexOfPage).Split('-')[1]);

            return pageNumber;
        }
    }

我可以使用MVC路由来限制页码吗？ 我想做这样的事情：

/category/page-#

/tag/product/page-#

......

routes.MapRoute(
  name: "limitPaging",
  url: "*/page-{pageNumber}",
  defaults: new { controller = "Error", action = "P404", }, 
            new { pageNumber = @"\d+" }, 
            new { pageNumber > 200 }
);

public class LessThanPage : IRouteConstraint
    {
        private int _maxPage;

        public LessThanPage(int maxPage)
        {
            _maxPage = maxPage;
        }

        public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {
            return httpContext.Request.RawUrl.ToLower().Contains("/page-") && GetPageNumberFromURL(httpContext.Request.RawUrl.ToLower()) > _maxPage;
        }

        private int GetPageNumberFromURL(string url)
        {
            var pageNumber = 1;
            var iIndexOfPage = url.IndexOf("/page-");
            var iIndexOfHash = url.IndexOf('#') > -1 ? url.IndexOf('#') : url.Length;
            if (iIndexOfPage >= 0 && iIndexOfHash - iIndexOfPage > 0)
                pageNumber = int.Parse(url.Substring(iIndexOfPage, iIndexOfHash - iIndexOfPage).Split('-')[1]);

            return pageNumber;
        }
    }

---

谢谢

您可以创建一个自定义路由约束（一个实现

IRouteConstraint

的类）

公共类LessThanPage:IRouteConstraint
{
专用int_maxPage；
公共LessThanPage（int-maxPage）
{
_maxPage=maxPage；
}
公共布尔匹配（HttpContextBase httpContext、路由路由、字符串参数名称、RouteValueDictionary值、RouteDirection RouteDirection）
{
返回Convert.ToInt32（值[parameterName].ToString（））new-LessThanPage（200）}
);

---

您还可以使用此方法验证参数是否为数字，从而在@Stephen Muecke answer的帮助下删除正则表达式约束

/category/page-#

/tag/product/page-#

......

routes.MapRoute(
  name: "limitPaging",
  url: "*/page-{pageNumber}",
  defaults: new { controller = "Error", action = "P404", }, 
            new { pageNumber = @"\d+" }, 
            new { pageNumber > 200 }
);

public class LessThanPage : IRouteConstraint
    {
        private int _maxPage;

        public LessThanPage(int maxPage)
        {
            _maxPage = maxPage;
        }

        public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {
            return httpContext.Request.RawUrl.ToLower().Contains("/page-") && GetPageNumberFromURL(httpContext.Request.RawUrl.ToLower()) > _maxPage;
        }

        private int GetPageNumberFromURL(string url)
        {
            var pageNumber = 1;
            var iIndexOfPage = url.IndexOf("/page-");
            var iIndexOfHash = url.IndexOf('#') > -1 ? url.IndexOf('#') : url.Length;
            if (iIndexOfPage >= 0 && iIndexOfHash - iIndexOfPage > 0)
                pageNumber = int.Parse(url.Substring(iIndexOfPage, iIndexOfHash - iIndexOfPage).Split('-')[1]);

            return pageNumber;
        }
    }

路由语法：

routes.MapRoute(
              name: "limitPaging",
              url: "{*url}",
              defaults: new { controller = "Error", action = "P404" },
              constraints: new { pageNumber = new LessThanPage(200), }
            );