DOTNET Core MVC(二)路由初探

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搁置了几天,工作忙的一塌糊涂,今天终于抽空来继续看看MVC的知识。先来看看MVC的路由是如何处理的。以下为替代的路由:

app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",pattern: {controller=Home}/{action=Index}/{id?});
            });

通过Configure方法在运行时,以委托的形式注册

UseEndpoints:将中间件添加到的IApplicationBuilder再调用方法时,需要先调用UseRouting。

public static IApplicationBuilder UseRouting(this IApplicationBuilder builder)
{
    if (builder == null)
    {
        throw new ArgumentNullException(nameof(builder));
    }
    VerifyRoutingServicesAreRegistered(builder);//校验是否加载完成
    var endpointRouteBuilder =  DefaultEndpointRouteBuilder(builder);
    builder.Properties[EndpointRouteBuilder] = endpointRouteBuilder;
    return builder.UseMiddleware<EndpointRoutingMiddleware>(endpointRouteBuilder);
}

将Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware中间件添加到指定的IApplicationBuilder中。

private static void VerifyRoutingServicesAreRegistered(IApplicationBuilder app)
{
     Verify if AddRouting was done before calling UseEndpointRouting/UseEndpoint
     We use the RoutingMarkerService to make sure if all the services were added.
    if (app.ApplicationServices.GetService(typeof(RoutingMarkerService)) ==  InvalidOperationException(Resources.FormatUnableToFindServices(
            nameof(IServiceCollection),nameof(RoutingServiceCollectionExtensions.AddRouting),ConfigureServices(...)));
    }
static IApplicationBuilder UseEndpoints(this IApplicationBuilder builder,Action<IEndpointRouteBuilder> configure)
{
     ArgumentNullException(nameof(builder));
    }
    if (configure ==  ArgumentNullException(nameof(configure));
    }
    VerifyRoutingServicesAreRegistered(builder);
    VerifyEndpointRoutingMiddlewareIsRegistered(builder,out var endpointRouteBuilder);
    configure(endpointRouteBuilder);
     Yes,this mutates an IOptions. We're registering data sources in a global collection which
     can be used for discovery of endpoints or URL generation.
    //
     Each middleware gets its own collection of data sources,and all of those data sources also
     get added to a global collection.
    var routeOptions = builder.ApplicationServices.GetrequiredService<IOptions<RouteOptions>>();
    foreach (var dataSource in endpointRouteBuilder.DataSources)
    {
        routeOptions.Value.EndpointDataSources.Add(dataSource);
    }
    return builder.UseMiddleware<EndpointMiddleware>();
}

ASP.NET Core 3使用完善的终结点路由,通常可以对应用程序内部的路由提供更多控制。端点路由分为两个单独的步骤:

在第一步中,再次匹配所请求的路由和配置的路由,找出以访问正在的路由。在最后一步中,对确定的路由进行评估,并调用相应的中间件。

两个步骤独立,允许其他中间件在这些点之间起作用。允许中间件利用来自一个子的端点路由信息来处理授权,而不必执行实际的处理程序。

app.UseRouting()将注册运行逻辑路由路由的中间件。

app.UseEndpoints()将执行该路由。

MapControllerRoute添加端点控制器操作的IEndpointRouteBuilder 并指定与路由给定namepattern,  defaultsconstraints,和dataTokens

其他:

MapController将添加属性路由的控制器支持

MapController将添加到该属性路由的控制器支持

MapControllerRoute 添加控制器的常规路由

原创。转载请注明出处。

啰嗦一堆,就说了两个方法下一篇接着说路由的用法

 

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