static void Invock12()
{
StateContext context = new StateContext(new StateA());
context.Request();
context.Request();
context.Request();
context.Request();
context.Request();
context.Request();
}
public abstract void Handle(StateContext context);
public override void Handle(StateContext context)
{
context.State = new StateA();
}
public override void Handle(StateContext context)
{
context.State = new StateA();
Console.WriteLine($"StateB.Handle状态：StateContext.State={ context.State.GetType().Name}");
}