How to get node children count after applying column filter

[Vamshi]

How to get node children count after applying column filter?

I used the following solution for counts, before filtering

http://www.telerik.com/community/forums/wpf/treelist/summing-up-parents-and-children.aspx

Now I am  stuck with counts, after filtering

Can any one help me plz?

[Dimitrina]

Hi,

Unfortunately there is not such a built-in functionality. 
As you calculate the nodes manually, then once the filtering has been applied, you will have to calculate that value. This can be done when the DataLoaded event is raised (after the filtering has been applied).
 

Regards,
Didie
Telerik

[Dan]

I managed to do this by getting the filter expression, and using it to get the filtered items.

private Predicate<T> GetFilterPredicate<T>()
{
  ParameterExpression parm = Expression.Parameter(typeof(T));
  Expression expr = FilterDescriptors.CreateFilterExpression(parm);
  if (expr.NodeType != ExpressionType.Call) return f => true;
  var lambda = Expression.Lambda<Predicate<T>>(expr, parm); return lambda.Compile();
}

This will at lease give you a function for traversing your tree to determine if a node is filtered.