public static UserDataService GetInstance()
{
if (instance == null)
{
instance = new UserDataService();
}
return(instance);
}
//用户登录状态
public void UserLogOn()
{
//用户登录
isUser = true;
isSupplier = false;
isLogOn = false;
//清空购物车菜品
UserDataService.GetInstance()._current.SampleItems.Clear();
SampleOrderVisible = Visibility.Visible;
ShoppingCartVisible = Visibility.Visible;
LogOnVisible = Visibility.Collapsed;
OrderViewVisible = Visibility.Collapsed;
ManagementVisible = Visibility.Collapsed;
}
