Question

I ve read that UseRouting matches a request to an endpoint, and UseEndpoints executes the matched endpoint. However, we have middleware in this order:

`...Another Middleware

UseRouting(); 

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


app.Map("/something", (context) => context.Response.WriteAsync("Hello World!"));

...Another Middleware`

因此,如果在马普勒罗特省援引使用,则使用方法如何与要求(如https:// localhost:5000/Home/Index)相匹配。换言之,使用方法如何知道这一终点(Home/Index)来进行比较?”

我没有尝试过任何事情,因为这是一个理论上的问题。

Answer 1

The endpoint is always null before UseRouting is called.If a match is found, the endpoint is non-null between UseRouting and UseEndpoints.The UseRouting middleware uses the SetEndpoint method to attach the endpoint to the current context.The UseEndpoints middleware is designed to be used in tandem with the UseRouting middleware.

// Location 1: before routing runs, endpoint is always null here.
app.Use(async (context, next) =>
{
    Console.WriteLine($"1. Endpoint: {context.GetEndpoint()?.DisplayName ?? "(null)"}");
    await next(context);
});

app.UseRouting();

// Location 2: after routing runs, endpoint will be non-null if routing found a match.
app.Use(async (context, next) =>
{
    Console.WriteLine($"2. Endpoint: {context.GetEndpoint()?.DisplayName ?? "(null)"}");
    await next(context);
});

// Location 3: runs when this endpoint matches
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

结果:

您可读到 ASP.NET。核心终点定义以了解更多情况。

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