为什么在 .netcore 3.1 中找不到 WebApi 授权服务? [英] Why WebApi Authorization service could not be found in .netcore 3.1?

问题描述

我正在 .netcore 3.1 中创建一个 webapi 项目，这是我在 program.cs 中的代码

I am creating a webapi project in .netcore 3.1 and this is my code in program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });
}

这是我的startup.cs:

and this is my startup.cs:

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public async Task ConfigureServices(IServiceCollection services)
    {
        services.AddAuthorization();

        services.RegisterEasyNetQ("host=localhost;username=admin;password=admin");
        services.AddSingleton(typeof(CreateOrderHandler));
        services.AddControllers();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseHttpsRedirection();

        app.UseRouting();

        app.UseAuthorization();
        app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
    }
}

但在运行该项目后，我收到此异常:

but after runing the project I am getting this Exception:

应用程序启动异常 System.InvalidOperationException: Unable找到所需的服务.请添加所有必需的服务在调用中调用IServiceCollection.AddAuthorization"应用程序启动代码中的ConfigureServices(...)".在Microsoft.AspNetCore.Builder.AuthorizationAppBuilderExtensions.VerifyServicesRegistered(IApplicationBuilder应用程序)在Microsoft.AspNetCore.Builder.AuthorizationAppBuilderExtensions.UseAuthorization(IApplicationBuilderapp) 在 project.Order.Startup.Configure(IApplicationBuilder app,IWebHostEnvironment 环境)在/82a891c3-0533-4937-9b8d-44d0c7405e9f/Roaming/project/project.Order/Startup.cs:System.RuntimeMethodHandle.InvokeMethod(对象目标，Object[] 参数、签名 sig、布尔构造函数、布尔值wrapExceptions) 在System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlagsinvokeAttr、Binder 绑定器、Object[] 参数、CultureInfo 文化)
在 Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object实例，IApplicationBuilder 构建器)在Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.b__0(IApplicationBuilder建设者)在Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.b__2(IApplicationBuilder应用程序)在Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder应用程序)在Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken取消令牌)未处理的异常.System.InvalidOperationException:无法找到所需的服务.请通过致电添加所有必需的服务'IServiceCollection.AddAuthorization' 内部调用应用程序启动代码中的'ConfigureServices(...)'

Application startup exception System.InvalidOperationException: Unable to find the required services. Please add all the required services by calling 'IServiceCollection.AddAuthorization' inside the call to 'ConfigureServices(...)' in the application startup code. at Microsoft.AspNetCore.Builder.AuthorizationAppBuilderExtensions.VerifyServicesRegistered(IApplicationBuilder app) at Microsoft.AspNetCore.Builder.AuthorizationAppBuilderExtensions.UseAuthorization(IApplicationBuilder app) at project.Order.Startup.Configure(IApplicationBuilder app, IWebHostEnvironment env) in /82a891c3-0533-4937-9b8d-44d0c7405e9f/Roaming/project/project.Order/Startup.cs:line 50 at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder) at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.b__0(IApplicationBuilder builder) at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.b__2(IApplicationBuilder app) at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder app) at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken) Unhandled exception. System.InvalidOperationException: Unable to find the required services. Please add all the required services by calling 'IServiceCollection.AddAuthorization' inside the call to 'ConfigureServices(...)' in the application startup code

我搜索了很多，但找不到任何提示.

I search a lot but cannot find any hint.

推荐答案

public async Task ConfigureServices(IServiceCollection services)

ConfigureServies 方法不应返回 Task.这意味着 ASP.NET Core 框架无法找到您添加的这个特定的 ConfigureServices 方法.

The ConfigureServies method is not expected to return a Task. This means the ASP.NET Core framework is unable to find this particular ConfigureServices method that you've added.

更新签名，如下:

public void ConfigureServices(IServiceCollection services)

通过此更改，将调用 ConfigureServices 方法，该方法将按预期添加服务.

With this change, the ConfigureServices method will be called, which will add the services, as intended.

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