Observable Collection添加項目時未更新

我嘗試了一切，但無法更新可觀察集合並在UI中反映出來。我有一個方法將一個新的條目添加到綁定到綁定到我的集合的CollectionViewSource的集合中。當我運行應用程序通用應用程序時，我正確地獲取列表，但如果我在點擊時添加一個值，則沒有任何內容會被反映。有什麼建議麼？Observable Collection添加項目時未更新

的XAML看起來是這樣的：

<SemanticZoom> 
       <SemanticZoom.ZoomedInView> 
        <ListView IsHoldingEnabled="True" 
          ItemsSource="{Binding Mode=OneWay, Source={StaticResource MenuGroups}}" 
          ItemTemplate="{StaticResource MenuItemTemplate}" 
          ContinuumNavigationTransitionInfo.ExitElementContainer="True"> 
         <ListView.GroupStyle> 
          <GroupStyle HidesIfEmpty="True" HeaderTemplate="{StaticResource MenuGroupHeaderTemplate}"/> 
         </ListView.GroupStyle> 
        </ListView> 
       </SemanticZoom.ZoomedInView> 
       <SemanticZoom.ZoomedOutView> 
        <GridView Background="Black" 
          ItemsSource="{Binding Source={StaticResource MenuGroups}, Path=CollectionGroups}" 
          ItemTemplate="{StaticResource MenuJumpTemplate}"> 
        </GridView> 
       </SemanticZoom.ZoomedOutView> 
      </SemanticZoom>

這裏是我後面的代碼代碼：

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Runtime.InteropServices.WindowsRuntime; 
using Windows.Foundation; 
using Windows.Foundation.Collections; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Controls.Primitives; 
using Windows.UI.Xaml.Data; 
using Windows.UI.Xaml.Input; 
using Windows.UI.Xaml.Media; 
using Windows.UI.Xaml.Navigation; 
using TestWin.TestWinService; 
using System.Globalization; 
using System.Collections.ObjectModel; 
using System.ComponentModel; 

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409 

namespace TestWin 
{ 
    /// <summary> 
    /// An empty page that can be used on its own or navigated to within a Frame. 
    /// </summary> 
    public sealed partial class MenuPage : Page 
    { 
     #region Members 
     TestWinConnectionClient TestWinService; 
     ObservableCollection<Menu> ocMenuItems = null; 
     ObservableCollection<AlphaKeyGroup<Menu>> ocItemSource = null; 
     #endregion Members 

     #region Properties 
     public ObservableCollection<Menu> MenuItems 
     { 
      get 
      { 
       if (ocMenuItems == null) 
       { 
        ocMenuItems = new ObservableCollection<Menu>(); 

       } 
       return ocMenuItems; 
      } 
      set 
      { 
       ocMenuItems = value;   
       OnPropertyChanged("MenuItems"); 
      } 
     } 

     public ObservableCollection<AlphaKeyGroup<Menu>> ItemSource 
     { 
      get 
      { 
       if (ocItemSource == null) 
       { 
        ocItemSource = new ObservableCollection<AlphaKeyGroup<Menu>>((AlphaKeyGroup<Menu>.CreateGroups(MenuItems, CultureInfo.CurrentUICulture, s => s.MenuName, true))); 
       } 
       return ocItemSource; 
      } 
      set 
      { 
       ocItemSource = value; 
       OnPropertyChanged("ItemSource"); 
      } 
     } 
     #endregion Properties 

     public MenuPage() 
     { 
      TestWinService = new TestWinConnectionClient(); 
      this.InitializeComponent();    
      #region Events 
      this.Loaded += MenuPage_Loaded; 
      #endregion 
     } 

     private void MenuPage_Loaded(object sender, RoutedEventArgs e) 
     { 
      SetItemSource(); 
     } 

     private async void SetItemSource() 
     { 
      MenuItems = await TestWinService.GetMenuEntriesAsync();   
      ((CollectionViewSource)Resources["MenuGroups"]).Source = ItemSource; 
     } 

     private void TextBlock_Tapped(object sender, TappedRoutedEventArgs e) 
     { 
      Menu m = new Menu(); 
      m.MenuName = "Test Entry"; 
      m.SysRowID = Guid.NewGuid(); 
      MenuItems.Add(m); 
      //this.Frame.Navigate(typeof(MenuPage)); 
     } 

     public event PropertyChangedEventHandler PropertyChanged; 
     void OnPropertyChanged(string propertyName) 
     { 
      if (PropertyChanged != null) 
      { 
       PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
      } 
     } 
    } 
}

來源

2015-07-21 Groops Groops

如果添加了新的項目，你也需要刷新的來源的MenuItems CollectionViewSource。

可能是你有一個ObservableCollection（的ItemSource）不是neccesary，你可以看看我是如何做到了在Codeproject

，並添加例如：

private async void Test() 
    { 
     await Task.Delay(5000); 
     for (int i = 0; i < 5; i++) 
     { 
      Favorites.Add(new Favorite() 
      { 
       Name = $"AAFriends {i}", 
       Category = new Category() { Name = "Friends" }, 
       Uri = "http://www.expediteapps.com/blog/" 
      }); 
     } 
     InitializeGrouping(); 
    }

，只有當刷新我再次調用分組。

來源

2015-07-21 06:56:42

嗨胡安帕布羅，這很有趣我的名字也是胡安帕布羅。我見過你的代碼，我的工作是通過你說的，我實例化了我的ItemSource，並更新了新的集合，並將其重新分配給我的視圖源。 –

ItemSource = new ObservableCollection >（（AlphaKeyGroup

.CreateGroups（MenuItems，CultureInfo.CurrentUICulture，s => s.MenuName，true）））; （（CollectionViewSource）Resources [「MenuGroups」]）。Source = ItemSource; 我將不得不瞭解可觀察的集合更多我還沒有看到可觀察的部分。謝謝！ –

Observable Collection添加項目時未更新

回答

相關問題