我有这个列表框代码
<ListBox x:Name="listaAdd" FontSize="30" Foreground="{StaticResource PhoneForegroundBrush}" ItemsSource="{Binding ListaMercados}" Grid.Row="0" UseLayoutRounding="False" Margin="0,0,0,52" LayoutUpdated="listaAdd_LayoutUpdated" >
<ListBox.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Stretch" Grid.Row="1" Width="480" >
<Grid.Background>
<SolidColorBrush Color="Transparent"/>
</Grid.Background>
<Grid.RowDefinitions>
<RowDefinition Height="80"/>
</Grid.RowDefinitions>
<Border x:Name="borda" Tap="Borda_OnTap" Background="Transparent">
<ListBoxItem x:Name="listSelected"
Grid.Row="1"
IsSelected="True"
VerticalAlignment="Center"
FontSize="25"
Content="{Binding Nome}"
HorizontalContentAlignment="Left"
Height="80"
Tap="ListSelected_OnTap"
FontFamily="Segoe UI" Margin="10,0,0,0" >
<ListBoxItem.Foreground>
<SolidColorBrush Color="#DEFFFFFF"/>
</ListBoxItem.Foreground>
</ListBoxItem>
</Border>
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu x:Name="subMenulist" Padding="0,0,0,0" FontFamily="Segoe UI" FontSize="32" Margin="0" VerticalAlignment="Center" Grid.RowSpan="1" Grid.ColumnSpan="1" TabNavigation="Local" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Background="White" >
<Button Grid.Column="1"
Content="excluir"
x:Name="btnExcluirDoSubMenu"
BorderThickness="0"
Margin="0,20,0,0"
Click="btnExcluirDoSubMenu_Click_1"
Foreground="#FF1A739D"
FontSize="32"
HorizontalContentAlignment="Stretch" Height="Auto" VerticalAlignment="Stretch" VerticalContentAlignment="Stretch" >
<Button.Background>
<SolidColorBrush Color="White"/>
</Button.Background>
</Button>
<Button Grid.Column="1"
Content="compartilhar"
Margin="0,-20,0,0"
x:Name="btnShare"
BorderThickness="0"
Click="btnShare_Click_1"
Foreground="#FF1A739D"
FontSize="32"
HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Background="White"/>
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
我的列表框数据来自投标项目源,这是我的问题
对于每个新行(列表框),我需要在两种颜色之间更改背景颜色示例:第一行:蓝色第二行:红色第三行:蓝色第四行:红色。. . 如果我无法访问标签内的项目,我该如何更改背景颜色????