c# - 绑定(bind)仅适用于第一个 TabItem

Question

我尝试更改 DataGridColumnHeader，它取决于 Combobox 值，但它仅适用于第一个 tabItem。如果我重新排序列 - 它仅适用于第一个 tabItem。我应该怎么办？我的 XAML:

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="0.15*"></RowDefinition>
        <RowDefinition></RowDefinition>
    </Grid.RowDefinitions>
    <ComboBox Margin="10" ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}"/>
    <TabControl Grid.Row="1">
        <TabItem Header="Second">
            <DataGrid AutoGenerateColumns="False">
                <DataGrid.Columns>
                    <DataGridTemplateColumn>
                        <DataGridTemplateColumn.Header>
                            <TextBlock Text="{Binding DataContext.SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                        </DataGridTemplateColumn.Header>
                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>
        </TabItem>
        <TabItem Header="First">
            <DataGrid AutoGenerateColumns="False">
                <DataGrid.Columns>
                    <DataGridTemplateColumn>
                        <DataGridTemplateColumn.Header>
                            <TextBlock Text="{Binding DataContext.SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                        </DataGridTemplateColumn.Header>
                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>
        </TabItem>
    </TabControl>
</Grid>

代码示例 here

Answer 1

header 基本上用于提供硬编码值。

使用标题模板:

   <TabControl Grid.Row="1">
        <TabItem Header="Second">
            <DataGrid AutoGenerateColumns="False">
                <DataGrid.Columns>
                    <DataGridTemplateColumn>
                        <DataGridTemplateColumn.HeaderTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding DataContext.SelectedItem, RelativeSource={RelativeSource  Mode=FindAncestor, AncestorType=Window}}" />
                            </DataTemplate>
                        </DataGridTemplateColumn.HeaderTemplate>

                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>
        </TabItem>
        <TabItem Header="First">
            <DataGrid AutoGenerateColumns="False">
                <DataGrid.Columns>                                              
                    <DataGridTemplateColumn>
                         <DataGridTemplateColumn.HeaderTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding DataContext.SelectedItem, RelativeSource={RelativeSource  Mode=FindAncestor, AncestorType=Window}}" />
                            </DataTemplate>
                        </DataGridTemplateColumn.HeaderTemplate>                            
                    </DataGridTemplateColumn>
                </DataGrid.Columns>
            </DataGrid>
        </TabItem>
    </TabControl>