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[英]asp.net core 2.0 DI Injecting multiple classes of IInterface into a controller
[英]Use DI in asp.net core 2.0 for injecting BLL services
我有使用BLL
( Business Logic Layer
)的asp.net core 2.0 Web Api
项目。 当我尝试在Controller
注入任何BLL
服务作为Dependancy
时,我收到错误。 我已经实现了以下Controller
:
namespace MyProject.WebApi.Controllers
{
[Route("api/test")]
public class TestController : Controller
{
private readonly ITestService _testService;
public TestController(ITestService testService)
{
_testService = testService;
}
[HttpGet, Route("get-all")]
public List<Test> Get()
{
return _testService.GetTestList();
}
}
}
我在BLL
(单独的项目)中实现了测试服务:
namespace MyProject.Core
{
public class TestService : ITestService
{
private readonly ITestEngine _testEngine;
public TestService(ITestEngine testEngine)
{
_testEngine = testEngine;
}
public List<Test> GetTestList()
{
return _testEngine.GetTestList();
}
}
}
我的TestService
接口如下所示:
namespace MyProject.Core
{
public interface ITestService
{
List<Test> GetTestList();
}
}
build
successful
但是当我调用TestController
Get
方法时,我收到以下错误:
fail: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[0]
An unhandled exception has occurred while executing the request
System.InvalidOperationException: Unable to resolve service for type 'MyProject.Infrastructure.Interface.ITestEngine' while attempting to activate 'MyProject.Core.TestService'.
有任何想法吗?
默认情况下,DI容器不知道您的服务。 您需要在Startup.cs
中的ConfigureServices
方法中手动注册它们,例如:
public void ConfigureServices(IServiceCollection services)
{
//Snip
services.AddScoped<ITestService, TestService>();
}
查看文档以了解服务所需的生命周期(即作用域,单例或瞬态)
在Startup类中,您需要手动将所需的每个服务添加到DI容器中:
public void ConfigureServices(IServiceCollection services)
{
// your current code goes here
// ...
services.AddScoped<ITestService, TestService>();
}
如果您希望自动执行此操作,则需要添加更专业的容器(如Autofac或StructureMap)。
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