在 IRouter 实现 ASP.NET Core MVC 上获取 404

Question

我正在尝试实现我自己的动态路由器，我的计划是从我的数据库中提取路由并创建一组动态登录页面，我的问题是在将 context.RouteData 设置为我的新页面后我得到 404路线数据。

我只想在每次找到路线时重定向到我的 LandingPageController 和索引 IActionResult。

using System.Threading.Tasks;
using Microsoft.AspNetCore.Routing;
using System.Collections.Generic;
using System.Linq;

namespace Myproject.Web.Main.Config
{
    public class LandingPageRouter : IRouter
    {
        public VirtualPathData GetVirtualPath(VirtualPathContext context)
        {
            return null;
        }

        public Task RouteAsync(RouteContext context)
        {

            var requestPath = context.HttpContext.Request.Path.Value;
            if (!string.IsNullOrEmpty(requestPath) && requestPath[0] == '/')
            {
                requestPath = requestPath.Substring(1);
            }

            var pagefound = GetPages().Any(x => x == requestPath);
            if (pagefound)
            {
                //TODO: Handle querystrings
                var routeData = new RouteData();
                routeData.Values["controller"] = "LandingPage";
                routeData.Values["action"] = "Index";
                context.RouteData = routeData;
            }

            return Task.FromResult(0);
        }

        private IEnumerable<string> GetPages()
        {
            //TODO: pull from database
            return new List<string> { "page-url-title", "another-dynamic-url" };
        }
    }
}

我查看了这个answer，但它似乎已经过时，上下文中的某些属性在 RC2 中甚至不再存在。

我错过了什么？

Answer 1

这似乎不是最好的解决方案，但根据我的测试，它应该可以满足您的要求。

---

我将默认的 MVC IRouter 注入到您的 LandingPageRouter 中。然后，一旦您更新了路由数据，只需调用默认路由器并传入上下文：

public class LandingPageRouter : IRouter
{
    private readonly IRouter _router;

    public LandingPageRouter(IRouter router)
    {
        _router = router;
    }

    public VirtualPathData GetVirtualPath(VirtualPathContext context)
    {
        return null;
    }

    public Task RouteAsync(RouteContext context)
    {

        var requestPath = context.HttpContext.Request.Path.Value;
        if (!string.IsNullOrEmpty(requestPath) && requestPath[0] == '/')
        {
            requestPath = requestPath.Substring(1);
        }

        var pagefound = GetPages().Any(x => x == requestPath);
        if (pagefound)
        {
            //TODO: Handle querystrings
            var routeData = new RouteData();
            routeData.Values["controller"] = "LandingPage";
            routeData.Values["action"] = "Index";
            context.RouteData = routeData;
            return _router.RouteAsync(context);
        }

        return Task.FromResult(0);
    }

    private IEnumerable<string> GetPages()
    {
        //TODO: pull from database
        return new List<string> { "page-url-title", "another-dynamic-url" };
    }
}

然后只需在Startup.Configure 中添加路由的任何位置插入默认路由：

app.UseMvc(routes =>
{
    routes.Routes.Add(new LandingPageRouter(routes.DefaultHandler));
    routes.MapRoute(
        name: "default",
        template: "{controller=Home}/{action=Index}/{id?}");
});

Answer 2

基于answer 和@sock 方法，我通过了路由构建器，该路由构建器将同时通过路由器上下文

public LandingPageRouter(IRouteBuilder routeBuilder)
{
    _routeBuilder = routeBuilder;
}

public Task RouteAsync(RouteContext context)
{
    var requestPath = context.HttpContext.Request.Path.Value;
    if (!string.IsNullOrEmpty(requestPath) && requestPath[0] == '/')
    {
        requestPath = requestPath.Substring(1);
    }

    var pagefound = GetPages().SingleOrDefault(x => x.Name == requestPath);
    if (pagefound!=null)
    {
        //TODO: Handle querystrings
        var routeData = new RouteData();
        routeData.Values["controller"] = "LandingPage";
        routeData.Values["action"] = "Index";
        routeData.Values["id"] = pagefound.Id;

        context.RouteData = routeData;
        return _routeBuilder.DefaultHandler.RouteAsync(context);
    }
    return Task.FromResult(0);
}

startup.cs 中的路由配置

app.UseMvc(routes =>
{
    routes.MapRoute(
    name: "default",
    template: "{controller=Home}/{action=Index}/{id?}");

    routes.Routes.Add(new LandingPageRouter(routes));
}