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从MVC路由器的虚拟路径中检索路由数据

asp.net-mvc-routing asp.net-core-mvc asp.net-core c#

Slava Knyazev · 技术社区 · 7 年前

我正在开发一个.NET核心MVC应用程序,它要求允许使用其他控制器/操作名称。为此,我在MapRoute上使用自己的路由器:

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

我的自定义路由器观察请求的控制器和操作,并基于它将一个新值放入请求中的routeddata中:

public async Task RouteAsync(RouteContext context)
{
   [...]
   if (requestedAction == "fakeAction")
    context.RouteData.Values["action"] = "realAction";

但是,要确定 requestedAction ,我基本上是采用请求的路径,将其拆分并以这种方式获取其值。这似乎不太理想。

var rr = new RouteBuilder(app);
var myRoute = rr.MapRoute(...).Build();
var myRouteData = myRoute.GetRouteData(context);
myRouteData["action"] == "fakeAction";

我非常喜欢的另一个解决方案是,如果我能做到以下几点:

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

something route实际上路由任何东西,并且只作为为我的CustomRouter定义RouteData的一种方式。

这两个都可能吗?我不喜欢我们不干净地实现现有功能的想法,因为这既是一种代码味道,也是未来潜在的维护困难。

1 回复 | 直到 7 年前

Hossein 7 年前

public async Task RouteAsync(RouteContext context)
{
    var requestPath = context.HttpContext.Request.Path.Value;

    if (!string.IsNullOrEmpty(requestPath) && requestPath[0] == '/')
    {
        // Trim the leading slash
        requestPath = requestPath.Substring(1);
    }

    // Get the page that matches.
    var page = GetPageList()
        .Where(x => x.VirtualPath.Equals(requestPath))
        .FirstOrDefault();

    // If we got back a null value set, that means the URI did not match
    if (page == null)
    {
        return;
    }


    //Invoke MVC controller/action
    var oldRouteData = context.RouteData;
    var newRouteData = new RouteData(oldRouteData);
    newRouteData.Routers.Add(this.target);

    // TODO: You might want to use the page object (from the database) to
    // get both the controller and action, and possibly even an area.
    // Alternatively, you could create a route for each table and hard-code
    // this information.
 if (context.RouteData.Values["action"] == "fakeAction")
    newRouteData.Values["controller"] = "realController";
    newRouteData.Values["action"] = "realAction";

    // This will be the primary key of the database row.
    // It might be an integer or a GUID.
    newRouteData.Values["id"] = page.Id;

    try
    {
        context.RouteData = newRouteData;
        await this.target.RouteAsync(context);
    }
    finally
    {
        // Restore the original values to prevent polluting the route data.
        if (!context.IsHandled)
        {
            context.RouteData = oldRouteData;
        }
    }
}

app.UseMvc(routes =>
{
    routes.Routes.Add(
       new CustomRoute(routes.ServiceProvider.GetRequiredService<IMemoryCache>(), 
                       routes.DefaultHandler));

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


});