1

我想将 ComboBox 绑定到 XDocument 中的 XElement。双向绑定适用于文本框，但不适用于组合框：

xml:

<Window x:Class="ComboBoxBindingTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="31,38,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" SelectedValue="{Binding Path=Element[step].Element[schema].Value}" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="31,117,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" Text="{Binding Path=Element[step].Element[schema].Value}"/>
        <TextBox Height="23" HorizontalAlignment="Left" Margin="31,214,0,0" Name="textBox2" VerticalAlignment="Top" Width="120" />
    </Grid>
</Window>

CS：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        comboBox1.Items.Add(new Tuple<string, string>("1", "Wert 1"));
        comboBox1.Items.Add(new Tuple<string, string>("2", "Wert 2"));
        comboBox1.Items.Add(new Tuple<string, string>("3", "Wert 3"));
        comboBox1.Items.Add(new Tuple<string, string>("4", "Wert 4"));
        comboBox1.Items.Add(new Tuple<string, string>("5", "Wert 5"));
        comboBox1.Items.Add(new Tuple<string, string>("6", "Wert 6"));
        comboBox1.Items.Add(new Tuple<string, string>("7", "Wert 7"));

        comboBox1.SelectedValuePath = "Item1";
        comboBox1.DisplayMemberPath = "Item2";

        XDocument doc = XDocument.Parse("<dir><step><schema>2</schema></step></dir>");
        DataContext = doc.Element("dir");
    }
}

将文本框中的文本更改为从 1 到 7 的另一个数字会导致组合框更新，但反之则不然。更改组合框选择时，XML 中的值不会更改。

ComboBox 绑定有什么问题？

谢谢

4

2 回答 2

0

试试这个

<Window x:Class="ComboBoxBindingTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="31,38,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120"  />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="31,117,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" Text="{Binding ElementName=textBox2, Path=Text}" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="31,214,0,0" Name="textBox2" VerticalAlignment="Top" Width="120" Text="{Binding ElementName=textBox1, Path=Text}" />
    </Grid>
</Window>


public MainWindow()
{
    InitializeComponent();
    comboBox1.Items.Add(new Tuple<string, string>("1", "Wert 1"));
    comboBox1.Items.Add(new Tuple<string, string>("2", "Wert 2"));
    comboBox1.Items.Add(new Tuple<string, string>("3", "Wert 3"));
    comboBox1.Items.Add(new Tuple<string, string>("4", "Wert 4"));
    comboBox1.Items.Add(new Tuple<string, string>("5", "Wert 5"));
    comboBox1.Items.Add(new Tuple<string, string>("6", "Wert 6"));
    comboBox1.Items.Add(new Tuple<string, string>("7", "Wert 7"));

    comboBox1.SelectedValuePath = "Item1";
    comboBox1.DisplayMemberPath = "Item2";

    Binding binding = new Binding("Text");
    binding.Mode = BindingMode.TwoWay;
    binding.Source = textBox1;
   comboBox1.SetBinding(ComboBox.SelectedValueProperty, binding);
}
于 2012-07-11T00:33:12.553 回答
0

这是 Microsoft 已知的 Bug，提供了 Hotfix：http: //support.microsoft.com/kb/2328886

此错误发生在 .NET 4.0 下将 Selector.SelectedValue（以及 SelectedItem 和 SelectedIndex；Selector 是 ComboBox 和 ListBox 的基类）与 XElement 或 XAttribute 结合使用时。

于 2012-07-12T07:25:15.920 回答