/// <summary>
/// 初始化单一实例应用程序对象。这是执行的创作代码的第一行，
/// 已执行，逻辑上等同于 main() 或 WinMain()。
/// </summary>
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
ImageCache.Clear(TimeSpan.FromDays(3));
}
/// <summary>
/// Clears the cache to ensure the images are released from memory correctly.
/// </summary>
public static void Clear()
{
ImageCache.Clear();
}
