取消選擇列表框中的選定項目

Question

我正在通過下面的代碼將“MiniTextBlock”文本添加到我的列表框，當我單擊該列表框項目時，它將顯示為“ShowTextBlock”並且所選項目在列表框中突出顯示，但如果“Show TextBlock”文本被更改，則所選項目仍然突出顯示，所以我希望它應該自動取消選擇。 為此，我正在使用此答案，但它僅在我直接通過 Xaml 添加列表框項時才有效，如果我使用模板綁定，則它不起作用。

XAML

<ListBox x:Name="FavoritesListBox" VerticalAlignment="Center"                         
                 Background="Transparent" Height="150"
                 ScrollViewer.HorizontalScrollBarVisibility="Auto"
                 ScrollViewer.VerticalScrollBarVisibility="Disabled"                     
                 SelectionChanged="FavoritesListBox_SelectionChanged">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Visibility="Visible" x:Name="FavoritesListBoxTextBlock" 
                               FontSize="30" Text="{Binding MyLists}"/>
                </DataTemplate>
            </ListBox.ItemTemplate>
</ListBox>

<Button Name="AddToFavoriteButton" Click="AddToFavoriteButton_Click" />

<TextBLock Name="MiniTextBlock" /> <!-- This will Contain diffrent texts -->

<TextBLock Name="ShowTextBlock" /> <!-- This will show list box selected item, but text can be change from other source so listbox selected item should deselect automatically -->

C＃

構造函數

IsolatedStorageFile Settings1 = IsolatedStorageFile.GetUserStoreForApplication();
MyDataList listobj = new MyDataList();

初始化時

public MainPage()
{
    this.InitializeComponent();

    //Populating ListBox items
    if (Settings1.FileExists("MyStoreItems"))
    {
        using (IsolatedStorageFileStream fileStream = Settings1.OpenFile("MyStoreItems", FileMode.Open))
        {
            DataContractSerializer serializer = new DataContractSerializer(typeof(MyDataList));
            listobj = (MyDataList)serializer.ReadObject(fileStream);
        }
    }
    FavoritesListBox.ItemsSource = listobj;

    //Checking whether selected item is equal to show textblock or not.
    DispatcherTimer timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(0) };
    timer.Tick += delegate (object sender, object e)
    {
        var selectedItem = FavoritesListBox.SelectedItem;

        if (selectedItem != null && selectedItem.ToString() != ShowTextBlock.Text)
        {
            FavoritesListBox.SelectedIndex = -1; //but it deselect item even if selected selected item is equal to Show Text Block.
        }
    };
    timer.Start();
}

代碼

private void AddToFavoriteButton_Click(object sender, RoutedEventArgs e)
{
    listobj.Add(new MyData { MyLists = MiniTextBlock.Text });

    //MiniTextBlock Which contains simple digit like 35 which will goto ListBox through this button

    using (IsolatedStorageFileStream fileStream = Settings1.OpenFile("MyStoreItems", FileMode.Create))
    {
        DataContractSerializer serializer = new DataContractSerializer(typeof(MyDataList));
        serializer.WriteObject(fileStream, listobj);
    }
}


public class MyData
{
    public string MyLists { get; set; }
}

public class MyDataList : ObservableCollection<MyData> //for storing mydata class items with type of list
{

}

//Selection Change for hint purpose

private void FavoriteListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    MyData selecteddata = (sender as ListBox).SelectedItem as MyData;

    if (selecteddata != null)
    {
        ShowTextBlock.Text = selecteddata.MyLists.ToString());

        using (IsolatedStorageFileStream fileStream = Settings1.OpenFile("MySelectedStoreItem", FileMode.Create))
        {
            DataContractSerializer serializer = new DataContractSerializer(typeof(MyData));
            serializer.WriteObject(fileStream, selecteddata);
        }
    }
}

Answer 1

您可以使用SelectedValue屬性根據ShowTextBlock.Text值選擇/取消選擇項目。 但是，我對您預期的數據流不是 100% 清楚。 如果您更詳細地描述哪些事件應該導致顯示什么樣的數據/選擇，我可以用更多詳細信息更新答案。

<ListBox x:Name="FavoritesListBox"
         SelectedValuePath="MyLists"
         SelectedValue="{Binding ElementName=ShowTextBlock,Path=Text,Mode=OneWay}">

如果要將所選項目與文本塊內容進行比較，請將所選項目轉換為您的數據類型並比較其文本屬性MyLists

if (selectedItem != null && ((MyData)selectedItem).MyLists != ShowTextBlock.Text)
{
    // ...
}