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我希望以一种优雅的方式更新我的列表视图。

这是我的代码：

ObservableCollection<Track> tracks = new ObservableCollection<Track>();
Track track = new Track();
Tracks.AddRange(track); // collection add a track, and list view updates too
Task.Factory.StartNew(() =>
    track.GetInfo(); // this operation might require some times to update
    // here I need to notify that my object is updated
);

我如何强制更新 ObservableCollection 中的对象绑定？

这是我的 userControl.xaml

<UserControl.Resources>
    <local:TimeConverter x:Key="timeConverter" />
    <local:IndexConverter x:Key="indexConverter" />
    <CollectionViewSource x:Key="trackList" Source="{Binding Path=TrackList.Tracks}"/>
</UserControl.Resources>

<DockPanel LastChildFill="True">
    <StackPanel Orientation="Horizontal" DockPanel.Dock="Bottom" Margin="2, 5, 2, 5">
        <Button Name="btn_addtrack" Command="{Binding AddTrack}" Content="+" />
    </StackPanel>
    <ListView Name="lv_tracklist" 
              DataContext="{StaticResource trackList}" 
              ItemsSource="{Binding}"
              >
        <ListView.View>
            <GridView>
                <GridViewColumn Header="#" Width="20" DisplayMemberBinding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}, Converter={StaticResource indexConverter}}" />
                <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Title}"/>
                <GridViewColumn Header="Artist" DisplayMemberBinding="{Binding Artist}"/>
                <GridViewColumn Header="Length" DisplayMemberBinding="{Binding Length, Converter={StaticResource timeConverter}}" />
                <GridViewColumn Header="Path" DisplayMemberBinding="{Binding Location}"/>
            </GridView>
        </ListView.View>
    </ListView>
</DockPanel>
4

2 回答 2

4

If you are opposed to implementing INotifyPropertyChanged you could set the binding to null then rebind but that is not what I would reccomend.

See this answer for notify all

notify-all-properties-of-the-view-model-has-changed

Unless you are changing all the properties I would go with the answer from Miklos. There is overhead to NotifyPropertyChanged.

Recommended pattern

   private string prop1

   Public string Prop1
   {
        get { return prop1; }
        set 
        {
            if (prop1 == value) return;
            prop1 = value;
            NotifyProperyChanged("Prop1");
        }
   {

Yes lines of code but then the UI only paints what has changed.

I just saw the update to your question and your comment.
An update to ALL is an update to each property.
The UI receives notification at the property level.
You only have 5 properties.

于 2012-09-20T13:23:56.343 回答
2

你的Track类需要实现INotifyPropertyChanged接口。

PropertyChanged在要发送通知的每个属性的设置器中引发事件（在设置新值之后）。

于 2012-09-20T13:07:27.767 回答