Windows Phone 获取系统主题

这里记录如何获取系统背景主题是黑色还是白色

C#:

Visibility darkBackgroundVisibility =(Visibility)Application.Current.Resources["PhoneDarkThemeVisibility"];

// Write the theme background value.
if (darkBackgroundVisibility == Visibility.Visible)
{
    theme = "black";
}
else
{
    theme = "white";
}

来源：http://msdn.microsoft.com/zh-cn/ff769545#BKMK_DeterminingThemeBackgroundAndAccentColor