如何在 .NET Core 中使用依赖注入注册多个项目？

Question

我有 3 个项目：

API 项目 > 其中包括控制器
DataLayer 项目 > 其中包括我的存储库、接口、ADO.NET 实体、上下文。（Class 库模板 .NET Framwork）
服务项目 > 其中包括我的服务、接口，您可以说是业务逻辑。（Class 库模板 .NET Framwork）

所以我的 API Project(Controller) 将调用 Services(Businesss Layer) 然后是 DataLayer Project(DbContext).

But when I run my project I am getting:
System.InvalidOperationException: Unable to resolve service for type 'ABCProject.Services.ServiceInterface.IRecruiterService' while attempting to activate 'ABCProject.API.Controllers.RecruiterController'.
   at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)
   at lambda_method3(Closure , IServiceProvider , Object[] )
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

我尝试了以下步骤：使用以下代码在项目中添加每个文件：

服务项目：

public static class ServiceCollectionExtensions
{
    public static IConfiguration Configuration { get; set; }
    public static IServiceCollection AddServiceConnector(this IServiceCollection services)
    {
        services.AddTransient<IRecruiterService, RecruiterService>();
        services.AddReposioryConnector(Configuration);
        return services;
    }
}

DataLayer 项目：

public static class ServiceCollectionExtensions
{
    public static IServiceCollection AddReposioryConnector(this IServiceCollection services, IConfiguration configuration)
    {
        services.AddTransient<IRecruiterRepository, RecruiterRepository>();
        services.AddDbContext<DNCLContext>(options =>
            options.UseSqlServer(configuration.GetConnectionString("DBConnection")));
        return services;
    }
}

然后在 API > Startup.cs:

public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers();
        services.AddSwaggerGen(c =>
        {
            c.SwaggerDoc("v1", new OpenApiInfo { Title = "ABCProject.API", Version = "v1" });
        });
       
        services.AddServiceConnector();
        services.AddReposioryConnector(Configuration);

    }

但还是没有运气。谁能指出错误在哪里。

Answer 1

感谢您的审阅。它现在 已解决 。解析度：我以前在我的服务和数据层项目中使用 Class Library(.NET Framework)。我将这些项目更改为 Class Library(.NET Core) 并且成功了。

如何在 .NET Core 中使用依赖注入注册多个项目？

How can I register Multiple projects using dependency injection in .NET Core?

c#

.net

asp.net-core

dependency-injection

repository-pattern