Asp.net 核心 2.2 拦截和更改路由数据值 - url 本地化

Question

在 asp.net 核心 2.2 中是否有可能为每个请求拦截路由数据并（可能）更改值，例如目标 controller / action值？

我需要使用本地化的 url 方案，包含两个字母的文化规范和本地化的控制器/操作名称，例如：

/en/contact-us
/it/contatti
/de/kontakte

我不想使用属性路由来装饰控制器和动作；相反，我想捕获路由数据并基于 culture 和 controller/action，获取目标控制器和操作，可能与字典关联。我已经在 asp.net（非核心）mvc 中做过这样的事情。

到目前为止，我可以使用以下代码捕获路由：

        app.Use(async (context, next) =>
        {
            var routeData = context.GetRouteData();


            routeData.Values["controller"] = ....;
            routeData.Values["action"] = .....;

            await next();
        });

但仅针对精确映射到现有 controller/action 的 url 填充路由数据，否则为空；这似乎是由于 asp.net 核心的 AttributeRouting.CreateAttributeMegaRoute 方法，它只映射现有的 controllers/actions.

Answer 1

这是适合我的解决方法：

// if the route matches this pattern, let's say:
app.UseMvc(routeBuilder => {
    routeBuilder.MapRoute("route1",template: "/{controller=Home}/{action=Index}");
});

// else if the route matches `{culture=en-US}/{controller=Home}/{action=Index}`
app.UseRouter(routeBuilder =>{
    var template = "{culture=en-US}/{controller=Home}/{action=Index}";
    routeBuilder.MapMiddlewareRoute(template, appBuilder =>{
        appBuilder.Use(async(context, next)=>{
            var routeData = context.GetRouteData();
            var controller = routeData.Values["controller"] as string;
            var action= routeData.Values["action"] as string;
            var culture= routeData.Values["culture"] as string;
            // get the real backing path according to current route data
            context.Request.Path = getNormalizedPath(routeData);  
            await next();
        });
        appBuilder.UseRequestLocalization();
        appBuilder.UseMvc(rb=>{
            rb.MapRoute(name:"cultureRoute",template:template);
        });
    });
    // if you have other MVC routes, add them below:
    // routeBuilder.MapRoute(name:"mvcRoutes",template: "{area:exists}/{controller=Home}/{action=Index}");
});

// else if doesn't match the above pattern, let's say:
app.UseMvc(routeBuilder => {
    routeBuilder.MapRoute("route3",template: "/test/mvc/{controller=Home}/{action=Index}");
});

private string getNormalizedPath(RouteData routeData)
{
    var culture= routeData.Values["culture"] as string;
    var controller = routeData.Values["controller"] as string;
    var action= routeData.Values["action"] as string;

    controller = ... real controller according to current culture & controller string
    action = ... real action according to current culture & controller string
    return $"/{culture}/{controller}/{action}";
}

您需要自定义 getNormalizedPath(routeData) 以获得将路由到支持 controller/action 的真实路径。

同时根据当前路由路径自动设置请求本地化功能，需要插入RouteDataRequestCultureProvider:

services.Configure<RequestLocalizationOptions>(options =>
{
    var supportedCultures = new[]{
        new CultureInfo("en"),
        new CultureInfo("fr"),
        new CultureInfo("de"),
        new CultureInfo("it"),
    };
    options.SupportedCultures = supportedCultures;
    options.SupportedUICultures = supportedCultures;
    options.RequestCultureProviders.Insert(0, new RouteDataRequestCultureProvider());
});

正如 @ʞᴉɯ 在评论中发现的那样，第一个 UseMvc() 不适用于 2.2。我们需要将 MVC 兼容性更改为 CompatibilityVersion.Version_2_1:

services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

Asp.net 核心 2.2 拦截和更改路由数据值 - url 本地化

Asp.net core 2.2 intercept and change route data values - url localization

routing

asp.net-core