Injection into Console Application with the Simple

Question

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.

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);
}

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();
}

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();
    }

}

BootStrap class here:

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();

    }
}

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

Answer 1

The problem is because you are calling your Bootstrap code in Program class instance constructor.

So, actually when you start your program the execution environment, is calling entry point method Main. And your instance constructor is never executed.

Try changing your entry point method Main and 'Bootstrap' class code:

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 2

Please use SimpleInjector

Sample please refer

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

Answer 3

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>();

Of course you will need to expose it in Bootstrap for that to work:

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();
    }
}

And call Bootstrap.Start from Program.Main:

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

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

    Console.ReadLine();
}