Question

我的Xaml-Code中有一个ListView，当它的Binding正在改变时我想更新它。我读了一些关于实现INotifyPropertyChanged的内容，但我并不熟悉如何做到这一点。

我在Xaml中的ListView：

<ListView IsItemClickEnabled="True"
    x:Name="itemListView"
    ScrollViewer.VerticalScrollMode="Auto"
    ScrollViewer.VerticalScrollBarVisibility="Auto" 
    AutomationProperties.AutomationId="ItemsListView"
    AutomationProperties.Name="Items"
    TabIndex="1"
    Grid.Row="1"
    Margin="-10,-10,0,0"
    Padding="120,0,0,60"
    ItemsSource="{Binding Source={StaticResource itemsViewSource}, Mode=TwoWay}"
    SelectionChanged="ItemListView_SelectionChanged"
    ItemTemplate="{StaticResource RepVSmallIcon70ItemTemplate}" 
    ItemContainerStyle="{StaticResource JobListViewItemStyle}" 
    IsRightTapEnabled="False" 
    ItemClick="itemListView_ItemClick" />

我的itemsViewSource资源：

<CollectionViewSource x:Name="itemsViewSource" Source="{Binding Items}"/>

我在c＃中的项目：[编辑：错误的课程]

//public class JobDataGroup : repVReportsDataCommon 
public class JobDataGroup : repVReportsDataCommon, INotifyPropertyChanged
{
    private Func<ServiceJobItem, bool> _predicate;

    public JobDataGroup(String uniqueId, String title, String subtitle, String imagePath, String description, Func<ServiceJobItem, bool> predicate)
        : base(uniqueId, title, subtitle, imagePath, description)
    {
        _predicate = predicate;
    }

    [XmlIgnore]
    public int JobCount
    {
        get { return this.Items.Count(); }
    }

    public ObservableCollection<ServiceJobItem> Items
    {
        get 
        {
            //[EDIT: changed from IEnumerable to ObservableCollection
            //return repVReportsDataSource.GetJobItems().Where(_predicate); 

            ObservableCollection<ServiceJobItem> collection = new ObservableCollection<ServiceJobItem>(repVReportsDataSource.GetJobItems().Where(_predicate));
            return collection;
        }
    }

    public IEnumerable<ServiceJobItem> TopItems
    {
        // Provides a subset of the full items collection to bind to from a GroupedItemsPage
        // for two reasons: GridView will not virtualize large items collections, and it
        // improves the user experience when browsing through groups with large numbers of
        // items.
        //
        // A maximum of 12 items are displayed because it results in filled grid columns
        // whether there are 1, 2, 3, 4, or 6 rows displayed
        get { return this.Items.Take(12); }
    }
}

Answer 1

让您的商品返回ObservableCollection，并且需要实施课程ServiceJobItem INotifyPropertyChanged 界面，以便ListView通知何时进行了更改..

绑定更改时如何更新ListView

1 个答案: