在自己的 ServiceCollection 中获取 IConfiguration

问题描述

我正在为我的 tests 制作 fixture.

Im making fixture to my tests.

在我的 FixtureFactory 中，我制作了自己的 ServiceCollection:

In my FixtureFactory im making my own ServiceCollection:

    private static ServiceCollection CreateServiceCollection()
    {
        var services = new ServiceCollection();

        services.AddScoped<IConfiguration>();
        services.AddScoped<ITokenService, TokenService>();
        services.AddDbContext<TaskManagerDbContext>(o => o.UseInMemoryDatabase(Guid.NewGuid().ToString()));
        services.AddIdentity<ApplicationUser, IdentityRole>(options =>
        {
            options.Password.RequiredLength = 6;
            options.Password.RequireLowercase = false;
            options.Password.RequireUppercase = false;
            options.Password.RequireNonAlphanumeric = false;
            options.Password.RequireDigit = false;
            options.User.RequireUniqueEmail = true;
        }).AddEntityFrameworkStores<TaskManagerDbContext>();

        return services;
    }

然后，我从 scope 获取这个 services:

Then, im getting this services from scope:

    var services = CreateServiceCollection().BuildServiceProvider().CreateScope();

    var context = services.ServiceProvider.GetRequiredService<TaskManagerDbContext>();
    var userManager = services.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>();
    var roleManager = services.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();
    var signInManager = services.ServiceProvider.GetRequiredService<SignInManager<ApplicationUser>>();
    var tokenService = services.ServiceProvider.GetRequiredService<TokenService>();

当我将 TokenService 添加到我的 ServiceCollection 时，问题就开始了.

The problem starts when i added TokenService to my ServiceCollection.

TokenService 的构造函数如下所示:

Constructor, of TokenService looks like this:

    private readonly IConfiguration configuration;

    private readonly UserManager<ApplicationUser> userManager;

    public TokenService(IConfiguration configuration, UserManager<ApplicationUser> userManager)
    {
        this.configuration = configuration;
        this.userManager = userManager;
    }

当我启动我的 Core 应用时效果很好，但在我上面提到的 ServiceCollection 中不起作用.

It works great when i launch my Core app, but wont work from ServiceCollection that i mentioned above.

在测试中，我开始收到此错误:

In Tests, i started to get this error:

消息:System.AggregateException:发生一个或多个错误.(无法为服务类型Microsoft.Extensions.Configuration.IConfiguration"实例化实现类型Microsoft.Extensions.Configuration.IConfiguration".)(以下构造函数参数没有匹配的装置数据:ServicesFixture fixture)---- System.ArgumentException:无法为服务类型Microsoft.Extensions.Configuration.IConfiguration"实例化实现类型Microsoft.Extensions.Configuration.IConfiguration".---- 以下构造函数参数没有匹配的夹具数据:ServicesFixture fixture

当我将 services.AddScoped(); 添加到我的 ServiceCollection 以及当我开始获取所需的服务 TokenService.

This error started to show when i added services.AddScoped<IConfiguration>(); to my ServiceCollection and when i started to get required service TokenService.

我的问题是，如何正确注册我在Service中使用的Configuration?

My question is, how to register properly Configuration that im using in Service?

我使用 Configuration 从 settings.json 获取项目.

Im using Configuration to get items from settings.json.

我的fixture和示例测试类:

public class ServicesFixture
{
    public TaskManagerDbContext Context { get; private set; }

    public UserManager<ApplicationUser> UserManager { get; private set; }

    public RoleManager<IdentityRole> RoleManager { get; private set; }

    public SignInManager<ApplicationUser> SignInManager { get; private set; }

    public TokenService TokenService { get; private set; }

    public ServicesFixture()
    {
        var servicesModel = ServicesFactory.CreateProperServices();

        this.Context = servicesModel.Context;
        this.UserManager = servicesModel.UserManager;
        this.RoleManager = servicesModel.RoleManager;
        this.SignInManager = servicesModel.SignInManager;
        this.TokenService = servicesModel.TokenService;
    }

    [CollectionDefinition("ServicesTestCollection")]
    public class QueryCollection : ICollectionFixture<ServicesFixture>
    {
    }
}

测试:

[Collection("ServicesTestCollection")]
public class CreateProjectCommandTests
{
    private readonly TaskManagerDbContext context;

    public CreateProjectCommandTests(ServicesFixture fixture)
    {
        this.context = fixture.Context;
    }
}

EDIT2

当我从我的集合中删除 AddScoped(); 并运行测试时，我收到此错误:

When i delete AddScoped<IConfiguration>(); from my collection and run tests, i get this error:

消息:System.AggregateException:发生一个或多个错误.(没有注册TaskManager.Infrastructure.Implementations.TokenService"类型的服务.)(以下构造函数参数没有匹配的夹具数据:ServicesFixture fixture)---- System.InvalidOperationException : 没有注册TaskManager.Infrastructure.Implementations.TokenService"类型的服务.---- 以下构造函数参数没有匹配的夹具数据:ServicesFixture fixture

推荐答案

您添加了 IConfiguration 而没有实现.

You added IConfiguration with no implementation.

在 startup.cs 中，框架会在幕后创建一个实现并添加它.你必须使用 ConfigurationBuilder

In startup.cs the framework would have created an implementation behind the scenes and added it. You will have to do the same using ConfigurationBuilder

var builder = new ConfigurationBuilder()
    //.SetBasePath("path here") //<--You would need to set the path
    .AddJsonFile("appsettings.json"); //or what ever file you have the settings

IConfiguration configuration = builder.Build();

services.AddScoped<IConfiguration>(_ => configuration);

//...

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