Performance with many controls and propertychanged

[Klemens]

Hi,
I'm using MvvM and the caliburn Micro toolset with the built in PropertyChangedBase.
On my view I have approximately 15 PropertyGrids with each about 12 properties.

In the background the user loads a xml file which is shown then in the view on the propertygrids.
When I fire the NotifyOfPropertyChange the ui blocks and it takes long till the ui reacts again.
The cpu usage goes up to ~25%. Is there a way to give this process more cpu usage or make the
NotifyOfPropertyChange threaded? 

Regards Markus

[Maya]

Hello Markus,

Will it be possible to try setting IsVirtualizing property of the grid to 'True"and RenderMode to "Flat" ? Do you still get the same performance ?   

Regards,
Maya
Telerik

[Klemens]

Hi,
thank you for your approach. On my developer machine it works a little bit faster.
On the client machines (Intel Atom Z2760 4x1,8Ghz, 2 GbRam, Win8) ther is a slight recognizable difference.
I tested it with JustTrace. CPU Loading Time increased from 148 to 146 seconds.

Regards Markus

[Maya]

Hello Markus,

Will it be possible to clarify what exactly you do ? How do you define your property grids ? How do you raise PropertyChanged ? Generally, any relevant information and code snippets will be helpful. 

Regards,
Maya
Telerik

[Klemens]

Hi,
the general Layout in my view is:

<Grid>
 <StackPanel>
  <HeaderedContentControl Header="1">
   <telerik:RadPropertyGrid Item="{Binding Path=Model.SelectedTask}">
    <telerik:RadPropertyGrid.PropertyDefinitions>
     <telerik:PropertyDefinition Binding="{Binding Name}"/>
     <telerik:PropertyDefinition Binding="{Binding Id}"/>
     <telerik:PropertyDefinition Binding="{Binding Adress}"/>
     ...
    </telerik:RadPropertyGrid.PropertyDefinitions>
   </telerik:RadPropertyGrid>
  </HeaderedContentControl>
  <HeaderedContentControl Header="2">
   <telerik:RadPropertyGrid Item="{Binding Path=Model.SelectedTask}">
    <telerik:RadPropertyGrid.PropertyDefinitions>
     <telerik:PropertyDefinition Binding="{Binding Name}"/>
     <telerik:PropertyDefinition Binding="{Binding Id}"/>
     <telerik:PropertyDefinition Binding="{Binding Adress}"/>
     ...
    </telerik:RadPropertyGrid.PropertyDefinitions>
   </telerik:RadPropertyGrid>
  </HeaderedContentControl>
  ...
 </StackPanel>
 ...
</Grid>

On my ViewModel I'm Injecting the Model which is singelton:

public GModel Model{get;set;}

public ViewModel()
{
  Model = ServiceLocator.Current.GetInstance<Model>();
}

On my Model I'm using:

public class GModel : PropertyChangedBase
{
  private Task selectedTask;

  public Task SelectedTask
  {
    get
    {
      return selectedTask;
    }
    set
    {
      selectedTask= value;
      NotifyOfPropertyChange(() => SelectedTask);
    }
  }

  public void SelectionChanged(Task task)
  {
      SelectedTask = task
  }
}

On the Task Class I have the properties.
I fear this is bad practice! Is it better to have the properties in the ViewModel?

Regards Markus

[Maya]

Hi Markus,

Please take a look at the sample attached and let me know whether the setup there is similar to yours. Is there something more specific that I need to do in order to reproduce the behavior you described with slower performance ?  

Regards,
Maya
Telerik

[Klemens]

Hi,
thank you for your help!
I will change the example to my conditions and test it.
May I upload it, if the behaviour still exists?

Regards Markus

[Maya]

Hello Markus,

That would be great. Please open a support ticket and attach it there. Thanks in advance. 

Regards,
Maya
Telerik

[Klemens]

Thank you!