c# – Unity Container同一接口的多个实现

这是我的代码：

public interface IRenderer
{
    void DrawSquare(Square square);
    void DrawCircle(Circle circle);
}

public interface IShape
{
    void Draw(IRenderer renderer);
}

public class Dx11Renderer : IRenderer
{
    public void DrawSquare(Square square)
    {
    }

    public void DrawCircle(Circle circle)
    {
    }
}

public class GlRenderer : IRenderer
{
    public void DrawSquare(Square square)
    {
    }

    public void DrawCircle(Circle circle)
    {
    }
}

public class Circle : IShape
{
    public void Draw(IRenderer renderer) { renderer.DrawCircle(this); }   
}

public class Square
{
    public void Draw(IRenderer renderer) { renderer.DrawSquare(this); }   
}

public class Canvas
{
    private readonly IRenderer _renderer;

    private List<Circle> _circles = new List<Circle>();
    private List<Square> _squares = new List<Square>(); 

    public Canvas(IRenderer renderer)
    {
        _renderer = renderer;
    }

    public void Draw()
    {
        foreach (Circle c in _circles)
        {
            c.Draw(_renderer);
        }

        foreach (Square s in _squares)
        {
            s.Draw(_renderer);
        }
    }
}

并注册/解决

// Create the container
        var container = new UnityContainer();

        // registration

        container.RegisterType<IRenderer,GlRenderer>("GL");
        container.RegisterType<IRenderer,Dx11Renderer>("DX11");

        Canvas canvas = container.Resolve<Canvas>("GL");

这会抛出“ResolutionFailedException”,所以我必须错误地使用它.

有人可以解释这是不好的做法,或者我是如何做到这一点的.

谢谢

更新：

所以我所做的是在每种类型的依赖项中注册Canvas两次,如下所示：

// Canvas with an OpenGL Renderer
container.RegisterType<Canvas>("GLCanvas",new InjectionConstructor(new ResolvedParameter<IRenderer>("GL")));
// Canvas with a DirectX Renderer
container.RegisterType<Canvas>("DXCanvas",new InjectionConstructor(new ResolvedParameter<IRenderer>("DX11")));

Canvas canvas = container.Resolve<Canvas>("GLCanvas");

这对我很有用！