在 windows Phone 8 c# 中不止一次设置了属性“visualTree" [英] The property 'visualTree' is set more than once in windows Phone 8 c#

问题描述

在我的 Windows Phone 应用程序中，我想获取所有带有复选框的联系人并显示在列表框中

In my windows phone application, I want to get all contacts with checkbox and show in list box

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <StackPanel Height="Auto" Width="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0,0,0,10">
            <TextBlock x:Name="ContactResultsLabel" Text="results are loading..." Style="{StaticResource PhoneTextLargeStyle}" TextWrapping="Wrap"></TextBlock>
            <ListBox x:Name="ContactResultsData" ItemsSource="{Binding listOfContacts}" Height="293" Margin="24,0,0,0">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <CheckBox Name="contactChk" IsChecked="true" Foreground="Black" Background="Black" BorderBrush="Black"></CheckBox>
                        <TextBlock x:Name="ContactResultsName" Text="{Binding Name}" FontSize="50"></TextBlock>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </StackPanel>
    </Grid>

但是当我在列表框的 DataTemplate 中添加 Checkbox 和 Textblock 时，它会出现以下错误:

But when I add Checkbox and Textblock in the DataTemplate of the listbox it gets me error below:

多次设置属性 'visualTree'

我不明白为什么它会给出，请建议我，等待您的答复.谢谢.

I don't understand why it gives, Kindly suggest me, waiting for your reply. Thanks.

推荐答案

DataTemplate中只能添加一个Element根，代码可以这样改:

You can add only one Element root in DataTemplate, code can change like this:

<DataTemplate>
    <Grid>
        <CheckBox Name="contactChk" IsChecked="true" Foreground="Black" Background="Black" BorderBrush="Black"></CheckBox>
        <TextBlock x:Name="ContactResultsName" Text="{Binding Name}" FontSize="50"></TextBlock>
    </Grid>
</DataTemplate>

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