Error: The name 'tBox' does not exist in the current context.

Question

Error: The name 'tBox' does not exist in the current context.

XAML:

<ItemsControl Name="itemsControl">
        <ItemsControl.Template>
            <ControlTemplate>
                <WrapPenel>
                    <ItemsPresenter/>
                </WrapPenel>
            </ControlTemplate>
        </ItemsControl.Template>
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <TextBlock Name="tBox" Text="{Binding Name}"></TextBlock>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

C#:

tBox.Background=Brushes.White; //Error: The name 'tBox' does not exist in the current context.

How to access control?

Answer 1

this.Background=Brushes.White; (assuming its code behind the control)?

Answer 2

Since Background is a dependency property, you will have to use

tBox.SetValue(BackgroundProperty, new SolidBrush(Color.White));

Answer 3

The TextBlock you named tBox is inside a DataTemplate. Controls inside a template are in a different name scope, so you can't access it in code-behind via its name. I'm not sure but you might get it via the ItemTemplate property and casting it to a TextBlock. Or you can add a property in your code-behind representing the background and use binding on the TextBlock's Background property. Hope this helps.

Answer 4

Set it on the TextBlock, in your DataTemplate:

        <DataTemplate>
            <TextBlock Name="tBox" Background="White" Text="{Binding Name}"></TextBlock>
        </DataTemplate>

Or if you wish to only set the Background in certain conditions, consider using Triggers:

        <DataTemplate>
            <TextBlock Name="tBox" Text="{Binding Name}"></TextBlock>
            <DataTemplate.Triggers>
                <Trigger SourceName="tBox" Property="IsMouseOver" Value="True">
                    <Setter TargetName="tBox" Property="Background" Value="White" />
                </Trigger>
            </DataTemplate.Triggers>
        </DataTemplate>

More information on how to use Triggers can be found here: http://www.codeproject.com/KB/WPF/GuidedTourWPF_4.aspx