分派器不會更新ListBox控件

Question

這是ListBox本身：

...
    <Window.Resources>
        <DataTemplate x:Key="ListBoxTemplate" DataType="ArticlesApp:Article">
            <StackPanel Margin="6, 10, 0, 0" Height="45">
                <DockPanel>
                    <TextBlock Text="{Binding Title}" FontWeight="Bold"/>
                </DockPanel>
                <DockPanel>
                    <TextBlock Text="{Binding Author, StringFormat='by {0}'}"/>
                </DockPanel>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>
...
<ListBox Grid.Row="0" x:Name="ListBox" SelectionChanged="ListBox_OnSelectionChanged" Background="#444444" SelectionMode="Single" ItemTemplate="{StaticResource ListBoxTemplate}"/>

而Dispatcher在后面的代碼中：

        public ArticlesView()
        {
            InitializeComponent();

            ...

            Dispatcher?.BeginInvoke(new Action(() => { ListBox.ItemsSource = GetArticles(); }), DispatcherPriority.Background);
        }

        public static List<Article> GetArticles()
        {
            var articles = new List<Article>();

            foreach (string file in Directory.GetFiles("articles", "*.json", SearchOption.AllDirectories))
            {
                File.OpenText(file);

                articles.Add(JsonConvert.DeserializeObject<Article>(File.ReadAllText(file)));
            }

            return articles;
        }

它可以在應用程序啟動時工作，將ListBox ItemSource分配給GetArticles ，但是如果有任何更改，它什么也不做。

Answer 1

代替使用List，使用ObservableCollection，這樣無論何時更改源，它都會自動觸發INotifyPropertyChange和INotifyCollectionChange，而itemsource將從集合中重新獲取。

public static ObservableCollection<Article> GetArticles()
    {

        var articles = new ObservableCollection<Article>();

        foreach (string file in Directory.GetFiles("articles", "*.json", SearchOption.AllDirectories))
        {
            File.OpenText(file);
            articles.Add(JsonConvert.DeserializeObject<Article>(File.ReadAllText(file)));
        }

        return articles;
    }