创建委托事件

Question

我正在尝试创建一个可以以另一种形式访问的委托事件。但主窗体看不到我的代表。它说此时代表名称无效。情态形式

public partial class GameOverDialog : Window
{
   public delegate void ExitChosenEvent();
   public delegate void RestartChosenEvent();

   public GameOverDialog()
   {
      InitializeComponent();
   }

   private void closeAppButton_Click(object sender, RoutedEventArgs e)
   {
      ExitChosenEvent exitChosen = Close;
      exitChosen();
      Close();
   }

   private void newGameButton_Click(object sender, RoutedEventArgs e)
   {
      RestartChosenEvent restart = Close;
      restart();
      Close();
   }
}

主要形式：

private void ShowGameOver(string text)
{
   var dialog = new GameOverDialog { tb1 = { Text = text } };
   dialog.RestartChosenEvent += StartNewGame();
   dialog.Show();
}

private void StartNewGame()
{
   InitializeComponent();
   InitializeGame();
}

在 @Fuex 的帮助后*

private void ShowGameOver(string text)
{
   var dialog = new GameOverDialog { tb1 = { Text = text } };
   dialog.RestartEvent += StartNewGame;
   dialog.ExitEvent += Close;
   dialog.Show();
}

Answer 1

它不起作用，因为delegate void RestartChosenEvent()声明了允许封装方法的引用类型。所以通过使用它+= StartNewGame会产生错误。正确的代码是：

public partial class GameOverDialog : Window
{
    delegate void myDelegate();

    public myDelegate RestartChosenEvent;
    public myDelegate ExitChosenEvent;

    public GameOverDialog()
    {
        InitializeComponent();
    }

    private void closeAppButton_Click(object sender, RoutedEventArgs e)
    {
        ExitChosenEvent();
        this.Close();
    }

    private void newGameButton_Click(object sender, RoutedEventArgs e)
    {
        RestartChosenEvent();
        this.Close();
    }
}

然后在主窗体中，您必须使用StartNewGame，它是要传递的方法的指针，而不是StartNewGame()：

private void ShowGameOver(string text)
{
   var dialog = new GameOverDialog { tb1 = { Text = text } };
   dialog.RestartChosenEvent += StartNewGame;
   dialog.Show();
}