使用Simple Injector注入控制台应用程序

Question

我使用Simple Injector进行测试,但是在OOP上使用了新的.我正在努力创造松散的夫妻班.这是我的情景.

我有这样的用户回购和界面.

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类和界面就像我计划在Programe Main中使用的那样.

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();
}

我的控制台程序如下所示:

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();
    }

}

BootStrap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();

    }
}

我运行程序时的问题,我在_userRepository内部得到了值异常TestInjectionClass.如何正确注入TestInjectionClass和UserRepository主程序.谢谢

Answer 1

你需要让Bootstrap.container可用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:

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

当然,您需要将其公开Bootstrap以使其工作:

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();
    }
}

并调用Bootstrap.Start来自Program.Main:

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

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

    Console.ReadLine();
}

Answer 2

问题是因为您Bootstrap在Program类实例构造函数中调用代码.

所以,实际上当你启动程序的执行环境时,就是调用入口点方法Main.并且您的实例构造函数永远不会被执行.

尝试更改入口点方法Main和'Bootstrap'类代码:

static void Main(string[] args)
{ 
     var container = new Container();
     Bootstrap.Start(container);
     _testInjectedClass = container.GetInstance<TestInjectedClass>();
     _testInjectedClass.UserRepoRun();

     Console.ReadLine();
}

class Bootstrap
{
    public static void Start(Container container)
    {
        // Register your types, for instance:
        container.Register<IUserRepository, UserRepository>(Lifestyle.Singleton);
        container.Register<ITestInjectedClass, TestInjectedClass>(Lifestyle.Singleton);
        container.Register<TestInjectedClass>();

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