DOTNET Core MVC（二）路由初探

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我是靠谱客的博主可耐大白，这篇文章主要介绍DOTNET Core MVC（二）路由初探，现在分享给大家，希望可以做个参考。

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：

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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再调用该方法时，需要先调用UseRouting。

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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 = new 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。

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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)) == null)
{
throw new InvalidOperationException(Resources.FormatUnableToFindServices(
nameof(IServiceCollection),
nameof(RoutingServiceCollectionExtensions.AddRouting),
"ConfigureServices(...)"));
}

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public static IApplicationBuilder UseEndpoints(this IApplicationBuilder builder, Action<IEndpointRouteBuilder> configure)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
if (configure == null)
{
throw new 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>();
}