Question

我有一个列表框，我从XML文件中解析信息。我为ListBoxItems创建了一个自定义用户控件，它包含一个复选框和一个用于保存人名的文本块。我的问题是我无法访问和控制代码中自定义ListBoxItem用户控件的控件。我不知道如何访问它们。我想按一下按钮的click事件来删除未检查的名称，并将已检查的名称保存到IsolatedStorage中的文件中。我还没有保存数据，因为我想先得到基本的“选中的复选框标识”。你能救我一下吗？

以下是代码：

    public partial class OppilasLista : PhoneApplicationPage

    {
        XDocument lista = XDocument.Load("NykyisetKurssit.xml");
        XDocument oppilasInfo = XDocument.Load("Oppilaat.xml");
        string id = string.Empty;

        public OppilasLista()
        {
            InitializeComponent();

        }

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            if (NavigationContext.QueryString.TryGetValue("id", out id))
            {

                var ryhma = (from ryhmaInfo in lista.Descendants("Kurssi")
                             where ryhmaInfo.Attribute("id").Value == id
                             select new Kurssit
                             {
                                 RyhmanNimi = (string)ryhmaInfo.Element("tunnus").Value

                             }).FirstOrDefault();

                PageTitle.Text = ryhma.RyhmanNimi;

                var oppilas = (from oppilaat in oppilasInfo.Descendants("Oppilas")
                               where oppilaat.Attribute("ryhma").Value == id
                               select new Kurssit
                               {
                                   OppilaanNimi = (string)oppilaat.Element("nimi").Value
                               });

                oppilaidenLista.ItemsSource = oppilas;

            }
            base.OnNavigatedTo(e);
        }

        private void Tallenna_Button_Click(object sender, RoutedEventArgs e)
        {

        }

    }

AND XAML

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle" Text="LÄSNÄOLOT" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock x:Name="PageTitle" Text="{Binding RyhmanNimi}" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <ListBox ItemsSource="{Binding}" x:Name="oppilaidenLista" Margin="0,0" Height="500" VerticalAlignment="Top" d:LayoutOverrides="VerticalAlignment">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <local:ListboxItem />
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
            <Button Content="Tallenna" Height="72" HorizontalAlignment="Left" Margin="12,506,0,0" Name="tallennaButton" VerticalAlignment="Top" Width="438" Click="Tallenna_Button_Click" />
        </Grid>
    </Grid>

AND Custom ListBoxItem控件

    <Grid x:Name="LayoutRoot">
        <CheckBox Height="72" HorizontalAlignment="Left" Margin="0,7,0,0" Name="checkBox" VerticalAlignment="Top" />
        <TextBlock Height="55" HorizontalAlignment="Left" Margin="74,12,0,0" Name="studentName" Text= "{Binding OppilaanNimi}" VerticalAlignment="Top" Width="394" FontSize="40" />
    </Grid>

Answer 1

我建议您将ListBox绑定到具有布尔属性的项集合，您可以绑定CheckBox的{{1}}属性。有些东西;

IsChecked

在LINQ语句中创建这些项目时，将它们存储在成员变量中，例如public class Kurssit : INotifyPropertyChanged { private string _Oppilaanimi; private bool _IsChecked; public string OppilaanNimi { get { return _Oppilaanimi; } set { if (_Oppilaanimi != value) { _Oppilaanimi = value; PropertyChanged(this, new PropertyChangedEventArgs("OppilaanNimi")); } } public bool IsChecked { get { return _IsChecked ; } set { if (_IsChecked != value) { _IsChecked = value; PropertyChanged(this, new PropertyChangedEventArgs("IsChecked")); } } public event PropertyChangedEventHandler PropertyChanged; }。

然后将private ObservableCollection<Kurssit> _Kurssit绑定到此成员变量;

ListBox

然后将自定义oppilaidenLista.ItemsSource = _Kurssit;控件更改为更像;

ListBoxItem

然后在按钮的点击处理程序中;

<Grid x:Name="LayoutRoot">
    <CheckBox IsChecked="{Binding IsChecked}" Height="72" HorizontalAlignment="Left" Margin="0,7,0,0" Name="checkBox" VerticalAlignment="Top" />
    <TextBlock Height="55" HorizontalAlignment="Left" Margin="74,12,0,0" Name="studentName" Text= "{Binding OppilaanNimi}" VerticalAlignment="Top" Width="394" FontSize="40" />
</Grid>

注意：因为在此示例中您绑定的成员变量类型为ObservableCollection{T}，调用private void Tallenna_Button_Click(object sender, RoutedEventArgs e) { List<Kurssit> selected = _Kurssit.Where(x => x.IsSelected == true).ToList() // You can now operate manipulate this sublist as needed // ie. Save this subset of items to IsolatedStorage // Or remove the items from the original _Kurssit collection... whatever :) }，Add()等等将引发事件和{{1}将根据需要响应这些添加/删除这些项的UI控件。

访问和控制自定义ListBoxItem控件

1 个答案: