LongListSelector獲取所選數據

Question

我需要從longlistselector中獲取所選數據，但普通代碼無法正常工作

xaml：

<phone:LongListSelector x:Name="MainLongListSelector" DataContext="{Binding listData}" IsGroupingEnabled="False" Grid.ColumnSpan="2" Margin="0,0,10,10" SelectionChanged="list_SelectionChanged">
                <phone:LongListSelector.ItemTemplate>
                    <DataTemplate>                        
                        <StackPanel Orientation="Horizontal">
                            <Image Source="{Binding ImgUrl}" Height="70" Stretch="Fill" Margin="0,0,10,10"/>
                            <StackPanel>
                                <TextBlock Text="{Binding ImgText}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                            </StackPanel>
                        </StackPanel>
                    </DataTemplate>
                </phone:LongListSelector.ItemTemplate>
            </phone:LongListSelector>

C＃：

    ObservableCollection<LongListData> listData = new ObservableCollection<LongListData>();
    listData.Add(new LongListData() { ImgText = "Imafsdfsge1", ImgUrl = new Uri("Assets/chart.png", UriKind.Relative) });     
MainLongListSelector.ItemsSource = listData;

但在事件上：

private void list_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            MessageBox.Show(MainLongListSelector.SelectedItem.ToString());
        } 

信息框說：+ longlistdata

為什么？

列表工作完美。

Answer 1

目前，您呼叫的ToString()是類型的選擇項目的方法LongListData如果你想顯示ImgText你需要做MainLongListSelector.SelectedItem.ImgText
或者您可以重寫ToString()方法並實現自己的邏輯。

Answer 2

據我的猜測，您想在消息框中顯示與圖像相關的文本。 即“ Imafsdfsge1”

要嘗試一下

var item = (sender as LongListSelector).SelectedItem as LongListData;
MessageBox.Show(item.SelectedItem.ImgText.ToString()); // output "Imafsdfsge1"

Answer 3

您需要將selecteditem轉換為要綁定到的自定義對象，

private void list_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var selecteditem = MainLongListSelector.SelectedItem as LongListData; 
            MessageBox.Show(selecteditem.ImgText.ToString());
        }