Parent property name with nested properties not updating

[Zberbang]

Hello!

I encountered the problem with parent property name which not updates if I modify child properties.
I have a class which overrides ToString() to return format string of its properties. When I change one of that property I fire PropertyChanged but ToString() never calling again and I see old name of parent property on GUI.
But the name is changing and ToString() is calling on each expanding/collapsing or searching.

Is it by desing or I have to do smth extra?

Here is a sample project with Q2 2013 libs to illustrate the problem.

[Hristo]

Hi Zber,

In order to update the parent property when it's children are modified you have to do the following steps:
1. Implement INotifyPropertyChanged for the parent property
2. Add event handler to handle the PropertyChanged event.

I have modified your sample project with the necessary changes.

Regards,
Hristo
Telerik

[Zberbang]

Hi Hristo,
thanks for explanation.
I have similar issue with collection editor - object name in left area is not refreshing on object changes.
I modified sample project to let Order have list of Employee. The only way to refresh Employee name in left area is to toggle parent object property Employees.

What should I do this time?

Here is a sample project.

[Hristo]

Hi Zber,

Basically when you edit the item properties, you don't send notifications to the parent that it's children have changed. You would have to implement an ObservableCollection of INotifyPropertyChanged.

You can see a demonstration of this in our online demo located here. Additional information about Collection editor is located here.

Regards,
Hristo
Telerik

[Zberbang]

Hi Christo,

Implementing an ObservableCollection of INotifyPropertyChanged won't cause correct updating object name on the left area.
You give me a link for silverlight demo and it's work as should but WPF demo don't.
I found the difference between two demos and found that silverlight version is changing template of CollectionEditorStyle:

<Style TargetType="telerik:CollectionEditor" BasedOn="{StaticResource CollectionEditorStyle}">
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<TextBlock Text="{Binding PropertyName}" />
</DataTemplate>
</Setter.Value>
</Setter>
</Style>

So that is the key to solve my problem.

[Hristo]

Hello Zber,

You will have to use the following style to update the UI when the first or last name is updated:

<Style TargetType="telerik:CollectionEditor">
     <Setter Property="ItemTemplate">
         <Setter.Value>
             <DataTemplate>
                 <TextBlock>
                     <TextBlock.Text>
                         <MultiBinding  StringFormat="{}{0}, {1} - {2}">
                             <Binding Path="LastName"/>
                             <Binding Path="FirstName"/>
                             <Binding Path="Department.Country"/>
                         </MultiBinding>
                     </TextBlock.Text>
                 </TextBlock>
             </DataTemplate>
         </Setter.Value>
     </Setter>
 </Style>

You can find more information about the string format property in the following article in msdn: article.

Regards,
Hristo
Telerik