Web框架 --- 一个Interface注入多个实例

如何注入

class MyImplA : IMyinterface
{public string ImplementationName => Consts.MyImplA;
}

class MyImplB : IMyinterface
{public string ImplementationName => Consts.MyImplB;
}

class DependencyInjection
{public DP(){services.AddSingleton<IMyinterface, MyImplA>();services.AddSingleton<IMyinterface, MyImplB>():}
}

如何获取

class MyClass
{private readonly IEnumerable<IMyinterface> _myInterfaces;public MyClass(IEnumerable<IMyInterface> myInterfaces){_myInterfaces = myInterfaces}public GetInplementation() {var myImplementation = _myInterfaces.FirstOrDefault(handler => handler.ImplementationName.Equals(Consts.MyImplB));}
}

Or

class MyClass
{private readonly IEnumerable<IMyinterface> _myInterfaces;public MyClass(IEnumerable<IMyInterface> myInterfaces){_myInterfaces = myInterfaces}public GetInplementation() {var myImplementation = _myInterfaces.FirstOrDefault(handler => handler.GetType() == typeof(MyImplB));}
}