使用端点路由时不支持使用“UseMvc"配置 MVC [英] Using 'UseMvc' to configure MVC is not supported while using Endpoint Routing

问题描述

我有一个 Asp.Net 核心 2.2 项目.

I had an Asp.Net core 2.2 project.

最近，我将版本从 .net core 2.2 更改为 .net core 3.0 Preview 8.此更改后，我看到此警告消息:

Recently, I changed the version from .net core 2.2 to .net core 3.0 Preview 8. After this change I see this warning message:

使用 Endpoint 时不支持使用UseMvc"来配置 MVC路由.要继续使用UseMvc"，请设置'ConfigureServices' 中的 'MvcOptions.EnableEndpointRouting = false'.

using 'UseMvc' to configure MVC is not supported while using Endpoint Routing. To continue using 'UseMvc', please set 'MvcOptions.EnableEndpointRouting = false' inside 'ConfigureServices'.

我知道通过将 EnableEndpointRouting 设置为 false 我可以解决这个问题，但我需要知道什么是解决它的正确方法以及为什么 Endpoint Routing 不需要 UseMvc() 函数.

I understand that by setting EnableEndpointRouting to false I can solve the issue, but I need to know what is the proper way to solve it and why Endpoint Routing does not need UseMvc() function.

推荐答案

但我需要知道解决它的正确方法是什么

but I need to know what is the proper way to solve it

通常，您应该使用 EnableEndpointRouting 而不是 UseMvc，您可以参考 更新路由启动代码了解详情启用 EnableEndpointRouting 的步骤.

In general, you should use EnableEndpointRouting instead of UseMvc, and you could refer Update routing startup code for detail steps to enable EnableEndpointRouting.

为什么端点路由不需要 UseMvc() 函数.

why Endpoint Routing does not need UseMvc() function.

对于UseMvc，它使用基于IRouter的逻辑，EnableEndpointRouting使用基于端点的逻辑.他们遵循不同的逻辑，可以在下面找到:

For UseMvc, it uses the IRouter-based logic and EnableEndpointRouting uses endpoint-based logic. They are following different logic which could be found below:

if (options.Value.EnableEndpointRouting)
{
    var mvcEndpointDataSource = app.ApplicationServices
        .GetRequiredService<IEnumerable<EndpointDataSource>>()
        .OfType<MvcEndpointDataSource>()
        .First();
    var parameterPolicyFactory = app.ApplicationServices
        .GetRequiredService<ParameterPolicyFactory>();

    var endpointRouteBuilder = new EndpointRouteBuilder(app);

    configureRoutes(endpointRouteBuilder);

    foreach (var router in endpointRouteBuilder.Routes)
    {
        // Only accept Microsoft.AspNetCore.Routing.Route when converting to endpoint
        // Sub-types could have additional customization that we can't knowingly convert
        if (router is Route route && router.GetType() == typeof(Route))
        {
            var endpointInfo = new MvcEndpointInfo(
                route.Name,
                route.RouteTemplate,
                route.Defaults,
                route.Constraints.ToDictionary(kvp => kvp.Key, kvp => (object)kvp.Value),
                route.DataTokens,
                parameterPolicyFactory);

            mvcEndpointDataSource.ConventionalEndpointInfos.Add(endpointInfo);
        }
        else
        {
            throw new InvalidOperationException($"Cannot use '{router.GetType().FullName}' with Endpoint Routing.");
        }
    }

    if (!app.Properties.TryGetValue(EndpointRoutingRegisteredKey, out _))
    {
        // Matching middleware has not been registered yet
        // For back-compat register middleware so an endpoint is matched and then immediately used
        app.UseEndpointRouting();
    }

    return app.UseEndpoint();
}
else
{
    var routes = new RouteBuilder(app)
    {
        DefaultHandler = app.ApplicationServices.GetRequiredService<MvcRouteHandler>(),
    };

    configureRoutes(routes);

    routes.Routes.Insert(0, AttributeRouting.CreateAttributeMegaRoute(app.ApplicationServices));

    return app.UseRouter(routes.Build());
}

对于EnableEndpointRouting，它使用EndpointMiddleware 将请求路由到端点.

For EnableEndpointRouting, it uses EndpointMiddleware to route the request to the endpoints.

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