彈出一個帶有返回值的消息對話框

Question

我是 c# 和 uwp 的新手

我彈出消息對話框的代碼是

    private void messageBoxClick(IUICommand command)
    {
        // Display message showing the label of the command that was invoked
        //rootPage.NotifyUser("The '" + command.Label + "' command has been selected.", NotifyType.StatusMessage);
    }

    public async Task messageBoxShow(string s, string commandString1, string commandString2)
    {
        var dialog = new Windows.UI.Popups.MessageDialog(s);
        dialog.Commands.Add(new UICommand(commandString1, new UICommandInvokedHandler(this.messageBoxClick)));
        dialog.Commands.Add(new UICommand(commandString2, new UICommandInvokedHandler(this.messageBoxClick)));

        await dialog.ShowAsync();


    }

有用！ 但我希望得到的風格是

    string s = messageBoxShow(s, commandString1, commandString2);

以前的樣式可以改成這個樣式嗎

歡迎您的評論

Answer 1

MessageDialog的顯示是一個異步操作， ShowAsync返回的結果是IUICommand 。 如果你想獲取的字符串值是IUICommand.Label ，你可以這樣寫：

public async Task<string> messageBoxShow(string s, string commandString1, string commandString2)
{
    var dialog = new MessageDialog(s);
    dialog.Commands.Add(new UICommand(commandString1, new UICommandInvokedHandler(this.messageBoxClick)));
    dialog.Commands.Add(new UICommand(commandString2, new UICommandInvokedHandler(this.messageBoxClick)));
    var result = await dialog.ShowAsync();
    return result.Label;
}

用法

string label = await messageBoxShow(s, commandString1, commandString2);