Windows phone 7 WP7停止页面导航/返回

当用户点击后退按钮后单击“取消”按钮时，如何阻止应用程序返回

      protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
    {
        var buttonInfo = MessageBox.Show("Are you sure you want to exit?", "Exit", MessageBoxButton.OKCancel);
        if (buttonInfo == MessageBoxResult.OK)
        {
            this.NavigationService.GoBack();
        }
        else
        {
            //How to stop page from navigating
        }
    }

---

使用

CancelEventArgs

取消操作、属性

再多一点

   protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
    {
        if (e.Cancel)
            return;

        var buttonInfo = MessageBox.Show("Are you sure you want to exit?", "Exit", MessageBoxButton.OKCancel);
        if (buttonInfo == MessageBoxResult.OK)
        {
          **//this line may useful if you are in the very first page of your app**
            if (this.NavigationService.CanGoBack) 
            {
                this.NavigationService.GoBack();
            }
        }
        else
        {
            //Stop page from navigating
            e.Cancel = true;
        }
    }

---

完美的非常感谢你！很高兴它对你有用。您还应该检查偶数是否已经取消，在这种情况下什么也不做。在这样做时要小心，因为根据使用情况，偶数可能会违反认证要求；明确地

   protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
    {
        if (e.Cancel)
            return;

        var buttonInfo = MessageBox.Show("Are you sure you want to exit?", "Exit", MessageBoxButton.OKCancel);
        if (buttonInfo == MessageBoxResult.OK)
        {
          **//this line may useful if you are in the very first page of your app**
            if (this.NavigationService.CanGoBack) 
            {
                this.NavigationService.GoBack();
            }
        }
        else
        {
            //Stop page from navigating
            e.Cancel = true;
        }
    }