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我在 App.xaml.cs 中添加了一个带有 3 个按钮的 appbar 以将其放在每个页面上,但我有一个页面,我想在其中添加另一个按钮。

我所做的是,我从 App.xaml.cs 中获得带有 3 个默认按钮的 appbar,然后添加我的另一个按钮。问题是当它被添加并且当我改变页面时,我添加的按钮保持可见......因此,这是对象引用的问题,因为每个页面都引用相同的应用栏。

我想知道是否可以只为带有 4 个按钮的页面复制此应用栏...(Icloneable?但我不知道如何:/)你怎么看?我还应该提到一些按钮使用导航转到另一个页面。

这是我的代码:

应用程序.xaml.cs

private ApplicationBar _appBar;
public ApplicationBar AppBar { get { return _appBar; } } //property called in other page

//Method called in the constructor
private void BuildLocalizedApplicationBar()
    {
        // Set the page's ApplicationBar to a new instance of ApplicationBar.
        _appBar = new ApplicationBar();

        // Create a new button and set the text value to the localized string from AppResources.
        var appBarButtonScan = new ApplicationBarIconButton(new Uri("/Assets/AppBar/White/appbar.qr.png", UriKind.Relative));
        appBarButtonScan.Click += AppBarButtonScanOnClick;
        appBarButtonScan.Text = AppResources.Scan;

        var appBarButtonSearch = new ApplicationBarIconButton(new Uri("/Assets/AppBar/White/appbar.search.png", UriKind.Relative));
        appBarButtonSearch.Click += AppBarButtonSearchOnClick;
        appBarButtonSearch.Text = AppResources.Search;

        var appBarButtonFacebook = new ApplicationBarIconButton(new Uri("/Assets/AppBar/White/appbar.facebook.png", UriKind.Relative));
        appBarButtonFacebook.Click += AppBarButtonFacebookOnClick;
        appBarButtonFacebook.Text = AppResources.MyAccount;

        _appBar.Buttons.Add(appBarButtonScan);
        _appBar.Buttons.Add(appBarButtonSearch);
        _appBar.Buttons.Add(appBarButtonFacebook);

        // Create a new menu item with the localized string from AppResources.
        ApplicationBarMenuItem appBarMenuSettings = new ApplicationBarMenuItem(AppResources.SettingsTitle);
        _appBar.MenuItems.Add(appBarMenuSettings);
    }

在我想要另外一个按钮的页面中:

private void BuildLocalizedApplicationBar()
    {
        App _app = Application.Current as App; //in my page, it's an attribute that I initialize in my constructor.
        ApplicationBar = _app.AppBar; //get the appbar with 3 buttons from App.xaml.cs

        // Create new buttons and set the text value to the localized string from AppResources.
        ApplicationBarIconButton appBarButtonTagPlace = new ApplicationBarIconButton(new Uri("/Assets/AppBar/White/appbar.heart.outline.png", UriKind.Relative));
        appBarButtonTagPlace.Text = AppResources.TagThisPlaceTitle;
        appBarButtonTagPlace.Click += AppBarButtonTagPlaceOnClick;


        ApplicationBar.Buttons.Add(appBarButtonTagPlace);
    }

先感谢您

4

1 回答 1

1

离开具有额外按钮的页面时,您可以删除该按钮。

protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
    ApplicationBar.Buttons.Remove(appBarButtonTagPlace);
    base.OnNavigatedFrom(e);
}
于 2013-04-23T15:44:08.220 回答