WPF: How do I debug binding errors?

Posted by Jonathan Allen on Stack Overflow See other posts from Stack Overflow or by Jonathan Allen
Published on 2010-06-05T18:36:54Z Indexed on 2010/06/05 18:42 UTC
Read the original article Hit count: 788

Filed under:

wpf

|

wpf-binding

I'm getting this in my output Window:

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=VerticalContentAlignment; DataItem=null; target element is 'ListBoxItem' (Name=''); target property is 'VerticalContentAlignment' (type 'VerticalAlignment')

This is my XAML, which when run looks correct

        <GroupBox Header="Grant/Deny Report">
            <ListBox ItemsSource="{Binding  Converter={StaticResource MethodBinder}, ConverterParameter=GrantDeny, Mode=OneWay}">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <Label Content="{Binding Entity}"/>
                            <Label Content="{Binding HasPermission}"/>
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </GroupBox>

© Stack Overflow or respective owner

Related posts about wpf

C#/WPF - RoutedEvent in WPF class that isn't a UIElement

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a class that needs to notify that something significant has occured. The class is in a WPF-project, even though this specific class, is lookless (and doesn't inherit from UIElement, neither directly or indirectly). Normally, I just register a RoutedEvent to get this functionality but as this… >>> More
How to pass value from wpf form to wpf user control

as seen on Stack Overflow - Search for 'Stack Overflow'
Hai am having a WPF user control in my WPF Form, when i click my button in my form , i just want to pass some value to the textbox which is in the usercontrol, tell me how to do this. >>> More
WPF opening up exe program within WPF window

as seen on Stack Overflow - Search for 'Stack Overflow'
Not sure if this is possible but is there a way to open up another program like notepad within the container of a WPF window? similiar to that of being able to open a web page using the webbrowser control? Basically I would like to open notepad or other exe but keep it constrained within the WPF… >>> More
Silverlight Commands Hacks: Passing EventArgs as CommandParameter to DelegateCommand triggered by Ev

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Today I've tried to find a way how to pass EventArgs as CommandParameter to DelegateCommand triggered by EventTrigger. By reverse engineering of default InvokeCommandAction I find that blend team just ignores event args.To resolve this issue I have created my own action for triggering delegate commands… >>> More
Building applications with WPF, MVVM and Prism(aka CAG)

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
In this article I am going to walk through an application using WPF and Prism (aka composite application guidance, CAG) which simulates engaging a taxi (cab). The rules are simple, the app would have3 screens A login screen to authenticate the user An information screen. A screen… >>> More

Related posts about wpf-binding

WPF Binding to change fill color of ellipse

as seen on Stack Overflow - Search for 'Stack Overflow'
Probably a simple question but: How do I programmatically change the color of an ellipse that is defined in XAML based on a variable? Everything I've read on binding is based on collections and lists -can't I set it simply (and literally) based on the value of a string variable? string color =… >>> More
WPF Binding Syntax Question

as seen on Stack Overflow - Search for 'Stack Overflow'
I've seen this syntax show up, and have tried to google for it's definition to no avail; what does it mean when a dp is bound this way? <Grid> <ContentControl Content="{Binding}"/> </Grid> I was under the assumption that you have to bind to some property on the DataContext… >>> More
WPF Binding with a Border

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a group of borders that make up a small map. Ideally I'd like to be able to bind the border's background property to a property in a custom list and when that property changes it changes the background. The tricky thing is, I have to do this in code behind. Could someone point me in the… >>> More
WPF: Binding Combobox in Code Behind to Property

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, This might be something very straight forward and I really think it should work as is, but it doesn't... I have the following scenario: var itemSource = new Binding { Path = new PropertyPath("ItemList"), Mode = BindingMode.OneTime }; comboBox.SetBinding(ItemsControl.ItemsSourceProperty… >>> More
WPF binding only inside XAML (simple question)

as seen on Stack Overflow - Search for 'Stack Overflow'
Why this works <myToolTip:UserControl1> <TextBlock Text="{Binding Path=TestString, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type myToolTip:UserControl1}}}"/> </myToolTip:UserControl1> BUT this does not <myToolTip:UserControl1 x:Name="userControl"> … >>> More