c# - 动态更改 GroupBox 的内容

Question

我有一个 GroupBox。此框包含一个 UserControl

<GroupBox Header="NewsBox">

    <GroupBox.Content>
        <NewsDay:NewsDayControl DataContext="{Binding SelectedNews}"/>
    </GroupBox.Content>

</GroupBox>

现在，我想根据 TabControl 的选定选项卡动态更改 GroupBox 的内容。

<DataTrigger Binding="{Binding  ElementName=TabControl, Path=SelectedIndex}" Value="0">
    <Setter Property="Visibility" Value="Hidden" />
</DataTrigger>

如果选择了索引为 1 的选项卡，这是应该出现的另一个 UserControl:

<Imprint:ImprintControl DataContext="{Binding SelectedImprint}"/>

我该怎么做？

Answer 1

您可以像这样将 Style 与触发器一起使用。

<GroupBox Header="NewsBox">
    <GroupBox.Style>
        <Style TargetType="GroupBox">
            <Style.Triggers>
                <DataTrigger Binding="{Binding  ElementName=TabControl, Path=SelectedIndex}" Value="0">
                    <Setter Property="Content">
                        <Setter.Value>
                            <NewsDay:NewsDayControl DataContext="{Binding SelectedNews}"/>
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding  ElementName=TabControl, Path=SelectedIndex}" Value="1">
                    <Setter Property="Content">
                        <Setter.Value>
                            <Imprint:ImprintControl DataContext="{Binding SelectedImprint}"/>
                        </Setter.Value>
                    </Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </GroupBox.Style>
</GroupBox>