Dictionary binding to ListBox Control

[Dharmavaram]

Hi,

    I am trying to bind dictionary object to ListBoxControl as shown below

         <telerik:RadListBox ItemsSource="{Binding Path=BooksAvailable}" Height="270">
            <telerik:RadListBox.ItemTemplate>
                <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <CheckBox IsChecked="{Binding Path=Value}"
                       Width="20" />
                    <TextBlock Text="{Binding Path=Key}"
                       Width="100" />
                </StackPanel>
                </DataTemplate>
            </telerik:RadListBox.ItemTemplate>
        </telerik:RadListBox>

      I want to do two way binding of the values so that if user unchecked I have to update internal Boolean value property.But it is giving exception two way binding can't be possible with dictionary value.

Please help to resolve this.

 

Regards,

Nagasree.

[Polya]

Hello Nagasree,

The issue is caused by the two-way binding with the read-only property Value - which is not supported:
"System.Windows.Markup.XamlParseException: A TwoWay or OneWayToSource binding cannot work on the read-only property 'Value' of type 'System.Collections.Generic.KeyValuePair`2[System.String,System.Boolean]'":

Because the two-way binding is not supported in the Microsoft's implementation of the KeyValuePair you can either use one-way binding with property Value or use an ObservableCollection<Custom_Class> instead of Dictionary.

I've prepared a sample project demonstrating the second approach. Please find it attached.

Hope this helps.

Regards,
Polya
Telerik by Progress