如何更改应用栏按钮的图标以c＃代码切换

Question

我想更改应用栏按钮的图标，一旦选中它就会切换，然后再取消选中。我确信使用了.icon属性，但我不知道该如何设置它。我想在每次点击时将其从播放按钮更改为暂停按钮。

    private void abtnTimer_Clicked(object sender, RoutedEventArgs e)
            {
               AppBarToggleButton btn = sender as AppBarToggleButton;
                if (btn.IsChecked == true)
                {
                    btn.Icon = //not sure what this should be
                    string s = DateTime.Now.ToString();
                    localSettings.Values["Timer"] = s;
                }
                else
                {
                    btn.Icon = //turn the icon into a play icon
                    DateTime dte = Convert.ToDateTime(localSettings.Values["Timer"]);
                    TimeSpan t;
                    t = DateTime.Now.Subtract(dte);
                    txtblkHoursData.Text = t.ToString();
                }
            }

Answer 1

将其设置为SymbolIcon - 播放播放符号：

btn.Icon = new SymbolIcon(Symbol.Play);

暂停符号暂停：

btn.Icon = new SymbolIcon(Symbol.Pause);