win8开发笔记6 消息框

直接上代码：

1. 界面上添加三个按钮和一个提示框：

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
            <StackPanel VerticalAlignment="Center" Margin="34,558,-34,137">
                <StackPanel Orientation="Horizontal">
                    <Button Content="一个按钮的消息框" Click="onOKClick"/>
                    <Button Content="两个按钮的消息框" Click="onYesNoClick"/>
                    <Button Content="三个按钮的消息框" Click="onThirdClick"/>
                </StackPanel>
            <TextBlock x:Name="tbTip" Margin="3,6,0,0" FontSize="24"/>
        </StackPanel>
        </Grid>

2. 相关函数如下：

        private async void onOKClick(object sender, RoutedEventArgs e)
        {
            MessageDialog msg = new MessageDialog("只带一个按钮的消息框。", "提示");
            msg.Commands.Add(new UICommand("确定", new UICommandInvokedHandler(OnUICommand)));
            await msg.ShowAsync();
        }

        private async void onYesNoClick(object sender, RoutedEventArgs e)
        {
            MessageDialog msg = new MessageDialog("带两个按钮的消息框。");
            msg.Commands.Add(new UICommand("是", new UICommandInvokedHandler(OnUICommand)));
            msg.Commands.Add(new UICommand("否", new UICommandInvokedHandler(OnUICommand)));
            await msg.ShowAsync();
        }

        private async void onThirdClick(object sender, RoutedEventArgs e)
        {
            MessageDialog msg = new MessageDialog("带三个按钮的消息框。");
            msg.Commands.Add(new UICommand("重试", new UICommandInvokedHandler(OnUICommand)));
            msg.Commands.Add(new UICommand("忽略", new UICommandInvokedHandler(OnUICommand)));
            msg.Commands.Add(new UICommand("取消", new UICommandInvokedHandler(OnUICommand)));
            // 默认按钮索引   
            msg.CancelCommandIndex = 2;
            msg.DefaultCommandIndex = 0;
            await msg.ShowAsync();
        }

        async void OnUICommand(IUICommand cmd)
        {
            await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,() =>
                {
                    this.tbTip.Text = "您点击了 " + cmd.Label + " 按钮。";
                });
        }