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[英]I want to show multiple pages with routing when user is not Authorized in Blazor
[英]I want to remove an item from flipview when the user change pages. Is there anything I can do?
我的要求是我在我的应用程序中使用了flipview并动态添加页面。我希望这样做,当我点击addpages按钮时,我的当前页面从flipview删除并且新页面出现。 我的addpage代码
public void Add_Pages_Click(object sender, RoutedEventArgs e)
{
try
{
my_canvas = new Canvas();
my_canvas.Name = "Item" + DateTime.Now.ToFileTime().ToString();
//fp1.ItemsSource = fi;
fp1.Items.Add(my_canvas);
fp1.SelectionChanged += Fp1_SelectionChanged;
Stickers1.Visibility = Visibility.Collapsed;
Backgrounds1.Visibility = Visibility.Collapsed;
Popup_wordart.IsOpen = false;
PopUp_Media.IsOpen = false;
my_canvas.Visibility = Visibility.Collapsed;
Audio_Recorder.IsOpen = false;
}
catch (Exception ex)
{
}
// Backward_Arrow.Visibility = Visibility.Visible;
}
一种非常方便的方法是在DataTemplate
为FlipView
每个项目构建一个结构,然后使用ObservableCollection
来添加,删除,刷新FlipView
的项目。
<FlipView x:Name="flipView" ItemsSource="{x:Bind flipviewCollection}">
<FlipView.ItemTemplate>
<DataTemplate>
<Canvas>
<Image Source="{Binding ImageSource}" Stretch="None"/>
</Canvas>
</DataTemplate>
</FlipView.ItemTemplate>
</FlipView>
为需要在DataTemplate
绑定的数据定义模型:
public class ImageSourceClass
{
public string ImageSource { get; set; }
}
然后在FlipView
的代码后面,创建此数据模型的集合并将数据添加到此集合:
ObservableCollection<ImageSourceClass> flipviewCollection = new ObservableCollection<ImageSourceClass>();
protected override void OnNavigatedTo(NavigationEventArgs e)
{
flipviewCollection.Clear();
flipviewCollection.Add(new ImageSourceClass { ImageSource = "Assets/1.jpg" });
flipviewCollection.Add(new ImageSourceClass { ImageSource = "Assets/2.jpg" });
flipviewCollection.Add(new ImageSourceClass { ImageSource = "Assets/3.jpg" });
flipviewCollection.Add(new ImageSourceClass { ImageSource = "Assets/4.jpg" });
flipviewCollection.Add(new ImageSourceClass { ImageSource = "Assets/5.jpg" });
}
最后,如果要删除项目并在Button click事件中添加新项目:
private void Button_Click(object sender, RoutedEventArgs e)
{
//index = flipView.SelectedIndex + 1 because when remove one item, next item will be shown,
//it will behavior like a new item replace the old one.
flipviewCollection.Insert(flipView.SelectedIndex + 1, new ImageSourceClass { ImageSource = "Assets/new.jpg" });
flipviewCollection.Remove(flipView.SelectedItem as ImageSourceClass);
}
问题是,如果您没有使用此方法来构建FlipView
,您只需手动将项目添加到FlipView
,您还需要在代码中手动删除一个,例如:
private void Button_Click(object sender, RoutedEventArgs e)
{
var my_canvas = new Canvas();
var textbox = new TextBox();
my_canvas.Children.Add(textbox);
flipView.Items.Insert(flipView.SelectedIndex + 1, my_canvas);
flipView.Items.RemoveAt(flipView.SelectedIndex);
}
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