Hi, 

Filtering doesn't listen to INotifyPropertyChanged, simply b/c if we did so, we'd have to walk your entire dataSource, and hook up an event to each item. 

So, if you know that your data has changed, you can let the xamGrid know by calling the InvalidateData method off of the xamGrid. 

xamGrid1.InvalidateData();

I hope this helps. 

-SteveZ

Stephen,

Thanks. That seems to work, but not fully. When the bound property value (based on which filter is setup) changes, the grid doesn't seem to automatically show/hide the row. I have to reset the filter every time a value changes, which wouldn't work. Please let me know how to make the grid respond to property value changes and show/hide rows automatically.

Thanks

Bhadri

Code:

The bound object type is like this:

// This does not implement INotifyPropertyChanged, but the proeperty is a DependencyProperty

class MyObjectType : FrameworkElement

{

public Visibility IsVisible{get;set;} // This is a DependencyProperty

}

And this filter setting works:

 Column col = (Column)xamGrid.Columns["IsVisible"];

// Create new RowsFilter object

//Create new ComparsionCondition, specifying values must be greater than 15

ComparisonOperator.Equals;

compCond.FilterValue =

Visibility.Visible;

//Add condition to the RowFilter

rf.Conditions.Add(compCond);

//Add RowFilter to the RowFiltersCollection

xamGrid.FilteringSettings.RowFiltersCollection.Clear();

xamGrid.FilteringSettings.RowFiltersCollection.Add(rf);

After thinking about this further, you could just add a hidden column for your Visibility property, and filter on it. 

That way, all rows that are collapsed, can be removed. 

You could apply the filter in the codebehind, so the users wouldn't know you had one applied:

http://help.infragistics.com/NetAdvantage/Silverlight/2010.3/CLR4.0/?page=SL_xamGrid_Programmatically_Create_a_Filter.html 

-Stevez

Another suggestion is to have a seperate "VisibleObjects" collection that represents just those data objects you want the grid to show.  Your app could update that collection, adding or removing objects based on the value of the bool property.  As long as that collection is observable, the grid will automatically respond to the changes in that collection.

Devin

Ok. Do I have to parse through the entire Row collection to find the matching Row? That's actually very expensive and wouldn't work as we are planning to bind this to 1000s of rows and we could also show/hide 1000s of rows at a time.

Thanks