注入控制台应用程序与简易注射器

问题描述

我使用简单的喷油器试验的目的，但对OOP prety新。我想创建松耦合夫妇类。这里是我的方案。

I am using Simple Injector for test purpose but prety new on OOP. I am trying to create loosly couple classes. Here is the my scenario.

我有用户的回购协议和接口这个样子。

I have User repo and interface like this.

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

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

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

我的 TestInjectedClass 类以及接口这样的事情，我很planng在PROGRAME主要使用

My TestInjectedClass Class and interface something like this which I am planng to use in Programe Main.

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",SureName = "stack"};
        _userRepository.Add(user);
    }
}
public interface ITestInjectedClass
{
    void UserRepoRun();
}

和我的控制台程序是这样的：

And My console programme looks like this:

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();
    }

}

}

引导类在这里：

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();

    }
}

我的问题，当我运行程序，我得到的 _userRepository 值异常中 TestInjectionClass 。
如何能够正确地注射 TestInjectionClass 和 UserRepository 主PROGRAME。谢谢

My problem when I run programme,I am getting value exception on the _userRepository inside TestInjectionClass.How can properly injected TestInjectionClass and UserRepository to Main Programe. Thanks

推荐答案

您需要让 Bootstrap.container 提供 Program.Main ，然后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：

You need to make Bootstrap.container available in Program.Main and then use it to create instances of classes instead of directly calling their constructors directly:

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

当然，你需要将其暴露在引导对于工作：

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();
    }
}

和调用 Bootstrap.Start 从 Program.Main ：

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

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

    Console.ReadLine();
}

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