当选择更改时，更改为MasterDetailsView上的其他DetailsTemplate

<MasterDetailsView x:Name="masterDetailsView" ItemsSource="{Binding Items}">
    <MasterDetailsView.MasterTemplate>
        <DataTemplate>
            <!-- 主列表的模板 -->
            <!-- 显示主列表的内容 -->
        </DataTemplate>
    </MasterDetailsView.MasterTemplate>
    <MasterDetailsView.DetailsTemplate>
        <DataTemplate>
            <!-- 默认的详细信息模板 -->
            <!-- 显示默认的详细信息 -->
        </DataTemplate>
    </MasterDetailsView.DetailsTemplate>
</MasterDetailsView>

// 监听Master列表的选择事件
masterDetailsView.SelectionChanged += MasterDetailsView_SelectionChanged;

private void MasterDetailsView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    // 获取选择的项
    var selectedItem = masterDetailsView.SelectedItem;

    // 根据选择的项来确定要显示的DetailsTemplate
    DataTemplate detailsTemplate = null;
    if (selectedItem == "A")
    {
        detailsTemplate = (DataTemplate)Resources["DetailsTemplateA"];
    }
    else if (selectedItem == "B")
    {
        detailsTemplate = (DataTemplate)Resources["DetailsTemplateB"];
    }
    else
    {
        detailsTemplate = (DataTemplate)Resources["DefaultDetailsTemplate"];
    }

    // 设置DetailsTemplate
    masterDetailsView.DetailsTemplate = detailsTemplate;
}