c# - 使用简单注入(inject)器注入(inject)控制台应用程序

Question

我正在使用 Simple Injector 进行测试，但在 OOP 上还很新。我正在尝试创建松散耦合的类。这是我的场景。

我有这样的用户存储库和界面。

public class UserRepository : IUserRepository
{
    public void Add(Model.User user)
    {
        Console.WriteLine("Name:"+user.Name+"\n"+"SurName:"+user.SurName);
    }

    public void Delete(int id)
    {
        throw new NotImplementedException();
    }
}

public interface IUserRepository
{
    void Add(User user);
    void Delete(int id);
}

我的 TestInjectedClass 类和接口(interface)是这样的，我打算在 Program Main 中使用。

public class TestInjectedClass : ITestInjectedClass
{
    private readonly IUserRepository _userRepository;
    public TestInjectedClass(IUserRepository userRepository)
    {
        _userRepository = userRepository;
    }

    public void UserRepoRun()
    {
        var user = new User() {Id = 1,Name = "ada",SurName = "stack"};
        _userRepository.Add(user);
    }
}
public interface ITestInjectedClass
{
    void UserRepoRun();
}

我的控制台程序是这样的:

class Program 
{
    static ITestInjectedClass _testInjectedClass;
    private static IUserRepository _userRepository;
    static void Main(string[] args)
    { 
        _testInjectedClass= new TestInjectedClass(_userRepository);
        _testInjectedClass.UserRepoRun();

        Console.ReadLine();
    }
    public Program()
    {                 
        Bootstrap.Start();
    }

此处为 BootStrap 类:

class Bootstrap
{
    public static void Start()
    {
        var container = new Container();

        // Register your types, for instance:
        container.Register<IUserRepository, UserRepository>(Lifestyle.Singleton);
        container.Register<ITestInjectedClass, TestInjectedClass>(Lifestyle.Singleton);
        //container.Register<IUserRepository, TestInjectedClass>(Lifestyle.Singleton);
        //container.Register<IUserContext, WinFormsUserContext>();
        container.Register<TestInjectedClass>();

        // Optionally verify the container.
        container.Verify();
    }
}

我在运行程序时遇到的问题是，TestInjectionClass 内的 _userRepository 出现值异常。 如何正确地将 TestInjectionClass 和 UserRepository 注入(inject)主程序。谢谢

Answer 1

您需要使 Bootstrap.container 在 Program.Main 中可用，然后使用它来创建类的实例，而不是直接直接调用它们的构造函数:

_testInjectedClass = Bootstrap.container.GetInstance<ITestInjectedClass>();

当然，您需要在 Bootstrap 中公开它才能工作:

class Bootstrap
{
    public static Container container;

    public static void Start()
    {
        container = new Container();

        // Register your types, for instance:
        container.Register<IUserRepository, UserRepository>(Lifestyle.Singleton);
        container.Register<ITestInjectedClass, TestInjectedClass>(Lifestyle.Singleton);
        //container.Register<IUserRepository, TestInjectedClass>(Lifestyle.Singleton);
        //container.Register<IUserContext, WinFormsUserContext>();
        container.Register<TestInjectedClass>();

        // Optionally verify the container.
        container.Verify();
    }
}

然后从 Program.Main 调用 Bootstrap.Start:

static void Main(string[] args)
{ 
    Bootstrap.Start();

    _testInjectedClass = Bootstrap.container.GetInstance<ITestInjectedClass>();
    _testInjectedClass.UserRepoRun();

    Console.ReadLine();
}