MessageBoxResult 按钮 取消 关闭应用程序

Question

当窗口关闭时，我调用方法 TryClose 来显示对话框。但是当我点击取消时，应用程序关闭。有什么想法只是“隐藏”对话框而不做任何其他事情吗？

public void TryClose()
{
    MessageBoxResult result = MessageBox.Show("Do you want to save changes?", appName, MessageBoxButton.YesNoCancel, MessageBoxImage.Warning);

    switch (result)
    {
        case MessageBoxResult.Yes:
            SaveAs();
            break;
        case MessageBoxResult.No:
            this.Close();
            break;
    }
}

Answer 1

将您的代码更改为：

public bool TryClose()
{
    MessageBoxResult result = MessageBox.Show("Do you want to save changes?", appName, MessageBoxButton.YesNoCancel, MessageBoxImage.Warning);

   switch (result)
   {
       case MessageBoxResult.Yes:
           SaveAs();
           return false;
       case MessageBoxResult.No:
           this.Close();
           return false;
   }

   return true;
}

在关闭事件处理程序中，输入以下内容：

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    e.Cancel = TryClose();
}

Answer 2

private void Form_FormClosing(object sender, FormClosingEventArgs e)
{
   TryClose(e);
}

进而：

switch (result)
{
    case MessageBoxResult.Yes:
        SaveAs();
        break;
    case MessageBoxResult.No:
        this.Close();
        break;
    default:
        e.Cancel=true;
        break;
}