在使用MapWhen进行分支时注册中间件以仅针对一组端点运行该中间件 [英] Registering a middleware while using MapWhen for branching to run it just for a set of endpoints

问题描述

我需要为所有端点(/accounts/*下的端点)运行两个中间件.

I need to run two middlewares for all my endpoints but the ones under /accounts/*.

我在ConfigureServices中使用它:

I use this in ConfigureServices:

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddControllers();
}

，配置方法如下:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IUserService  userService)
{
    app.UseCors(builder => builder
        //.AllowAnyOrigin()
        .SetIsOriginAllowed((host) => true)
        .AllowAnyMethod()
        .AllowAnyHeader()
        .AllowCredentials());

    app.UseRouting();

    app.UseAuthentication();

    //THIS IS WHAT I JUST ADDED TO SUPPORT THE BRANCHING OF ROUTES
    app.MapWhen(context =>
    {
        return !context.Request.Path.StartsWithSegments("/accounts");
    }, appBuilder =>
    {
        appBuilder.UseMiddleware<TenantProviderMiddleware>();
        appBuilder.UseMiddleware<UserClaimsBuilderMiddleware>();
    });

    //app.UseMiddleware<TenantProviderMiddleware>();
    //app.UseMiddleware<UserClaimsBuilderMiddleware>();

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapHub<VehicleHub>("/vehicle-hub");
        endpoints.MapControllers();
    });

 }

但是我遇到了以下错误:

But I'm getting the following error:

System.InvalidOperationException:请求到达了管道的末尾，而没有执行端点:"WebAPI.Controllers.VehiclesController.Get(WebApi)".如果使用路由，请使用"IApplicationBuilder.UseEndpoints(...)"注册EndpointMiddleware.

System.InvalidOperationException: The request reached the end of the pipeline without executing the endpoint: 'WebAPI.Controllers.VehiclesController.Get (WebApi)'. Please register the EndpointMiddleware using 'IApplicationBuilder.UseEndpoints(...)' if using routing.

从错误中我了解到，我应该在MapWhen方法中使用UseEndpoints而不是UseMiddleware，但无法正确处理.

From the error I understand that I should be using UseEndpoints instead of UseMiddleware in the MapWhen method but can't get it right.

那我该如何注册中间件?

How should I register the middlewares then?

推荐答案

您似乎需要文档:

...根据给定谓词的结果分支请求管道.与 MapWhen 不同，如果该分支没有短路或包含终端中间件，则该分支将重新连接到主管道

...branches the request pipeline based on the result of the given predicate. Unlike with MapWhen, this branch is rejoined to the main pipeline if it doesn't short-circuit or contain a terminal middleware

因为您使用的是 MapWhen ，所以 UseAuthorization 和 UseEndpoints 都不会影响您的/accounts/路径.您显示的错误是因为在这种情况下Endpoints中间件未运行.

Because you're using MapWhen, both UseAuthorization and UseEndpoints have no affect for your /accounts/ paths. The error you've shown is because the Endpoints middleware isn't running in this scenario.

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