我正在编写一个WPF'Reversi'游戏,其中玩家在8x8网格中按下一块图块来放置一块石头。如何在不导致InvalidOperationException的情况下延迟ICommand执行?
这是一个棋子在瓦片上的命令:
private class Click : ICommand
{
private readonly SquareViewModel squareViewModel;
public ClickCommand(SquareViewModel squareViewModel)
{
this.squareViewModel = squareViewModel;
squareViewModel.Square.IsValidMove.PropertyChanged += (sender, args) =>
{
if (CanExecuteChanged != null)
{
/*->*/ CanExecuteChanged(this, new EventArgs());
}
};
}
public event EventHandler CanExecuteChanged;
public bool CanExecute(object parameter)
{
return squareViewModel.Square.IsValidMove.Value;
}
public void Execute(object parameter)
{
squareViewModel.Square.PlaceStone();
}
}
我已经设定的AI是放在一块石头时,它的播放器2的依次是:
void CurrentPlayer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
Player player = ((ICell<Player>)(sender)).Value;
if (player != null && player.Equals(Player.TWO))
{
Vector2D nextMove = ai.FindBestMove(boardViewModel.Game);
rowDataContexts[nextMove.Y].SquareDataContexts[nextMove.X].SquareViewModel.Click.Execute(null);
}
}
}
这工作完全正常。不过,我希望爱好者在2秒后立即行动,而不是立即行动。
我试图实现这样的延迟:
void CurrentPlayer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
Player player = ((ICell<Player>)(sender)).Value;
if (player != null && player.Equals(Player.TWO))
{
Vector2D nextMove = ai.FindBestMove(boardViewModel.Game);
Task.Delay(2000).ContinueWith(_ =>
{
rowDataContexts[nextMove.Y].SquareDataContexts[nextMove.X].SquareViewModel.Click.Execute(true);
});
}
}
但是这导致的InvalidOperationException
在ClickCommand
在与CanExecuteChanged(this, new EventArgs())
(我第一个代码示例中放一个箭头,相关线路)线路。这发生在2秒后(只要Task.Delay继续)。
我该如何解决这个问题?