Question

我使用Simple Injector进行测试，但在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类和接口类似于我计划在Programe Main中使用的。

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();

    }
}

我运行程序时出现问题，我_userRepository TestInjectionClass内的值{0}}。如何正确地将TestInjectionClass和UserRepository注入主程序。感谢

Answer 1

您需要在Bootstrap.container中使Program.Main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中公开它才能发挥作用：

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();
    }
}

从Bootstrap.Start致电Program.Main：

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

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

    Console.ReadLine();
}

Answer 2

问题是因为您在Bootstrap类实例构造函数中调用了Program代码。

因此，实际上当您启动程序执行环境时，正在调用入口点方法Main。而且你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();
    }
}

Answer 3

请使用SimpleInjector

样品请参考

http://www.c-sharpcorner.com/UploadFile/4d9083/dependency-injection-using-simple-injector/

使用Simple Injector注入控制台应用程序

3 个答案: