在tabcontrol标头内的弹出窗口中绑定一个列表框

问题描述

我正在选项卡标题中创建一个弹出窗口，我想将列表绑定到弹出窗口中的列表框。但绑定无效。此弹出窗口位于选项卡控件的控件模板内。

<Popup PlacementTarget="{Binding ElementName=ConnectionListDropDownButton}" IsOpen="{Binding ElementName=ConnectionListDropDownButton,Path=IsChecked}"   AllowsTransparency="True"   PopupAnimation="Slide"    StaysOpen="False">
    <Grid>
        <ListBox Name="ConnectionList" ItemsSource="{Binding tabItems}"  Background="White" SelectionChanged="ConnectionList_SelectionChanged" MaxHeight="300" BorderBrush="LightGray" BorderThickness="1" SelectionMode="Single" Selectedindex="-1">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Header}"></TextBlock>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Popup>

这是我的列表，需要绑定。

public ObservableCollection<TabItem> tabItems { get; set; } = 
    new ObservableCollection<TabItem>();

解决方法

您可以将Tag的{​​{1}}属性绑定到定义了source属性的父控件，然后将Popup绑定到父控件的ListBox属性Tag：

Popup

您不能使用<Popup PlacementTarget="{Binding ElementName=ConnectionListDropDownButton}" IsOpen="{Binding ElementName=ConnectionListDropDownButton,Path=IsChecked}" AllowsTransparency="True" PopupAnimation="Slide" StaysOpen="False" Tag="{Binding RelativeSource={RelativeSource AncestorType=UserControl}}"> <Grid> <ListBox Name="ConnectionList" ItemsSource="{Binding Tag.tabItems,RelativeSource={RelativeSource AncestorType=Popup}}" Background="White" SelectionChanged="ConnectionList_SelectionChanged" MaxHeight="300" BorderBrush="LightGray" BorderThickness="1" SelectionMode="Single" SelectedIndex="-1"> <ListBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Header}"></TextBlock> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid> </Popup> 将Popup中的直接绑定到父控件。