CODEWITHSUNDEEP
c#wpfbinding
Cinaird
Cinaird

Reputation: 785

Binding problem in C# wpf

I have a problem whit binding in wpf i have a textbox where i can do some input, then i try to bind the textinput to a custom usercontrol. This work for the usercontrol within RowDetailsTemplate but not in the CellTemplate. For each object in the CellTemplate i get this error output:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=ScaleTextBox'. BindingExpression:Path=Text; DataItem=null; target element is 'Chart' (Name=''); target property is 'MaxValue' (type 'Int32')

My code looks like this:

XAML
<ToolBarTray ToolBarTray.IsLocked="True"  DockPanel.Dock="Top" Height="25">
    <ToolBar Name="ButtonBar" >
        <TextBox Height="23" Name="ScaleTextBox" Width="120" Text="400"/>
    </ToolBar>
</ToolBarTray>
<DataGrid ItemsSource="{Binding Path=Items}" AutoGenerateColumns="False" IsReadOnly="True" RowHeight="25" RowDetailsVisibilityMode="VisibleWhenSelected">
       <DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <StackPanel Orientation="Vertical" >
                <my:UserControl ItemsSource="{Binding Path=Samples}" MaxValue="{Binding ElementName=ScaleTextBox, Path=Text}"/>-->
            </StackPanel>
        </DataTemplate>
    </DataGrid.RowDetailsTemplate>
    <DataGrid.Columns>
        <DataGridTemplateColumn MinWidth="150" Header="Chart" >
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <my:UserControl ItemsSource="{Binding Path=Samples}" MaxValue="{Binding ElementName=ScaleTextBox, Path=Text}"/><!-- this is the problem -->
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>

    </DataGrid.Columns>

</DataGrid>

C#
public static readonly DependencyProperty MaxValueProperty = DependencyProperty.Register("MaxValue", typeof(int), typeof(Chart), new FrameworkPropertyMetadata(MaxValuePropertyChanged));
private static void MaxValuePropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
{
    Console.WriteLine(e.NewValue);
}

What do i do wrong?

Upvotes: 2

Views: 2435

Answers (3)

Amsakanna
Amsakanna

Reputation: 12934

From this link

The Columns collection is just a property in the Datagrid; this collection is not in the logical (or visual) tree, therefore the DataContext is not being inherited, which leads to there being nothing to bind to.

Hence it works for your RowDetailsTemplate and not for your columns I guess.

Upvotes: 1

Cinaird
Cinaird

Reputation: 785

Ok, i Solved it using ElementSpy, to see how elementSpy works look here: http://joshsmithonwpf.wordpress.com/2008/07/22/enable-elementname-bindings-with-elementspy/

and the xaml:

<my:UserControl  local:ElementSpy.NameScopeSource="{StaticResource ElementSpy}" ItemsSource="{Binding Path=Samples}" MaxValue="{Binding ElementName=ScaleTextBox, Path=Text}" />

Upvotes: 1

Andy
Andy

Reputation: 3743

You can try this:

<DataTemplate>
   <my:UserControl 
     ItemsSource="{Binding Path=Samples}" 
     MaxValue="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:YourControlClassName}}, ElementName=ScaleTextBox, Path=Text}"/>
</DataTemplate>

Upvotes: 1

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