绑定到 List时如何使 ListBox 可编辑？

发布于 2024-11-03 14:03:35 字数 1097 浏览 4 评论 0原文

编辑：基本问题是将列表绑定到ListBox（或任何其他控件）。所以我正在编辑问题。

我将字符串列表绑定到列表框，如下所示。但是，当我更改文本框的内容时，它并没有更改源列表中的字符串。为什么？

  public partial class MainWindow : Window
{
    List<string> _nameList = null;

    public List<string> NameList
    {
        get
        {
            if (_nameList == null)
            {
                _nameList = new List<string>();
            }
            return _nameList;
        }
        set
        {
            _nameList = value;
        }
    }
    public MainWindow()
    {
        NameList.Add("test1");
        NameList.Add("test2");
        InitializeComponent();
    }

和 XAML

 <ListBox Grid.Row="0" Grid.Column="0" DataContext="{Binding ElementName=main}" ItemsSource="{Binding NameList}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBox Text="{Binding .,Mode=OneWayToSource ,  UpdateSourceTrigger=PropertyChanged}"/>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

原文

Edit: The basic problem is binding a List to ListBox(or any other control). So I am editing the question.

I bound a list of string to a ListBox as below. However when I change the contents of the textbox it is not changing the string in the source list.Why?

  public partial class MainWindow : Window
{
    List<string> _nameList = null;

    public List<string> NameList
    {
        get
        {
            if (_nameList == null)
            {
                _nameList = new List<string>();
            }
            return _nameList;
        }
        set
        {
            _nameList = value;
        }
    }
    public MainWindow()
    {
        NameList.Add("test1");
        NameList.Add("test2");
        InitializeComponent();
    }

And the XAML

 <ListBox Grid.Row="0" Grid.Column="0" DataContext="{Binding ElementName=main}" ItemsSource="{Binding NameList}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBox Text="{Binding .,Mode=OneWayToSource ,  UpdateSourceTrigger=PropertyChanged}"/>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

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无人问我粥可暖 2024-11-10 14:03:35

每个 ListBoxItem 的 DataContext 是字符串本身，因此绑定的路径为空 (.)。 TwoWay 和 OneWayToSource 绑定需要路径，因为您不能只替换当前的 DataContext。因此，您需要将字符串包装在一个将字符串公开为属性的对象中：

public class StringItem
{
    public string Value { get; set; }
}

将字符串公开为 StringItem 列表：

public partial class MainWindow : Window
{
    List<StringItem> _nameList = null;

    public List<StringItem> NameList
    {
        get
        {
            if (_nameList == null)
            {
                _nameList = new List<StringItem>();
            }
            return _nameList;
        }
        set
        {
            _nameList = value;
        }
    }
    public MainWindow()
    {
        NameList.Add(new StringItem { Value = "test1" });
        NameList.Add(new StringItem { Value = "test2" });
        InitializeComponent();
    }

并绑定到 Value 属性：

<ListBox Grid.Row="0" Grid.Column="0" DataContext="{Binding ElementName=main}" ItemsSource="{Binding NameList}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding Value, UpdateSourceTrigger=PropertyChanged}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

请注意StringItem 还需要实现 INotifyPropertyChanged 以便自动更新绑定。您还应该将列表公开为 ObservableCollection 而不是 List

The DataContext of each ListBoxItem is the string itself, so the path of your binding is empty (.). TwoWay and OneWayToSource bindings require a path, since you can't just replace the current DataContext. So you need to wrap your string in an object that exposes the string as a property:

public class StringItem
{
    public string Value { get; set; }
}

Expose the strings as a list of StringItem:

public partial class MainWindow : Window
{
    List<StringItem> _nameList = null;

    public List<StringItem> NameList
    {
        get
        {
            if (_nameList == null)
            {
                _nameList = new List<StringItem>();
            }
            return _nameList;
        }
        set
        {
            _nameList = value;
        }
    }
    public MainWindow()
    {
        NameList.Add(new StringItem { Value = "test1" });
        NameList.Add(new StringItem { Value = "test2" });
        InitializeComponent();
    }

And bind to the Value property:

<ListBox Grid.Row="0" Grid.Column="0" DataContext="{Binding ElementName=main}" ItemsSource="{Binding NameList}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding Value, UpdateSourceTrigger=PropertyChanged}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Note that StringItem will also need to implement INotifyPropertyChanged so that bindings are automatically updated. You should also expose the list as an ObservableCollection<T> rather than a List<T>

回复收藏 0 原文

可是我不能没有你 2024-11-10 14:03:35

可能有帮助吗？

<ListBox Name="lsbList">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding Path=Value}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

May be it helsp?

<ListBox Name="lsbList">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding Path=Value}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

回复收藏 0 原文

箜明 2024-11-10 14:03:35

您可以使用项目控件和文本框创建 DataGridTemplateColumn.CellEditingTemplate 来编辑项目

回复收藏 0 原文

眼泪都笑了 2024-11-10 14:03:35

如果我没有误解你的问题，那么实现起来非常容易。看：

<ComboBox Text="My Comment 5 with addition." IsEditable="True" Height="25" Width="200">
        <ComboBoxItem>My comment1</ComboBoxItem>
        <ComboBoxItem>My comment2</ComboBoxItem>
</ComboBox>

If I didn't misunderstand your question, it is pretty easy to implement. Look:

<ComboBox Text="My Comment 5 with addition." IsEditable="True" Height="25" Width="200">
        <ComboBoxItem>My comment1</ComboBoxItem>
        <ComboBoxItem>My comment2</ComboBoxItem>
</ComboBox>

回复收藏 0 原文

~没有更多了~