GridGroupingControl Exception

Hi, I use a gridGroupingControl with an ArrayList of ''CoolCompte'' as data source. I use two GridColumnDescriptor. The first one use "Numero" as MappingName. The second use "Libelle" as MappingName. I use two classes : ''CoolCompte'' and ''CoolCompteTiers''. The ''CoolCompte'' class have 2 string properties : "Numero" & "Libelle". The ''CoolCompteTiers'' inherit from ''CoolCompte'' and have a ''Collectif'' property. When i bind the grid with an array list of ''CoolCompte'', it works fine. When i rebind the grid with an array list of ''CoolCompteTiers'', it works fine. When i rebind the grid whith an array list of ''CoolCompte'', this exception occurs and my application freeze. System.Reflection.TargetInvocationException: L''accesseur de propriété ''Collectif'' sur l''objet ''SageCoala.Cool.Compta.CoolCompte'' a levé l''exception suivante :''L''objet ne correspond pas au type cible.'' ---> System.Reflection.TargetException: L''objet ne correspond pas au type cible. at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess) at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean verifyAccess) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) at System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component) --- Fin de la trace de la pile d''exception interne --- at System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component) at Syncfusion.Grouping.FieldDescriptor._GetValue(Record record) catched at Syncfusion.Grouping.FieldDescriptor._GetValue(Record record) in :line 0 Why do the grid try to access to the ''Collectif'' property whereas there''s no GridColumnDescriptor with Collectif MappingName. Is there a work arround ? Regards, Mikaël

Try calling TableDescriptor.Columns.LoadDefault after setting up the columns and DataSource. Here is a little sample. http://www.syncfusion.com/Support/user/uploads/GGC_ArrayList_d5553255.zip

The TableDescriptor.Columns.LoadDefault method modify the way the columns were ordered and do not fix the problem. Is there any other solution ?

Does the sample throw teh exception for you? If so, what version are you using? I used 3.2.1.0. You can control the order in which the columns are displayed by populating grid.TableDescriptor.VisibleColumns in teh order you want to see teh columns after the call to LoadDefault.

I used 3.2.1.0. I attached a sample to show the problem ( This sample). Click Button 1 : It''s Ok Click Button 2 : It''s Ok Click Button 1 again : The exception occurs

I can avoid the problem by adding these lines at the very top of your BindData routine.

if(this.ggc_grid.DataSource != null)
{
	this.ggc_grid.BeginUpdate();
	this.ggc_grid.DataSource = null;
	this.ggc_grid.Refresh();
	this.ggc_grid.EndUpdate(false);
}

I will send your sample onto the grid architect to see why the code does not work without nulling the datasource.

Thanks, it works fine.

Let me elaborate a little further: If I call this.gridGroupingControl1.ResetTableDescriptor(); this.gridGroupingControl1.TableDescriptor.Relations.Reset(); I obviously loose all descriptors, create at design time and do not want to recreate them manually everytime the datasource changes Thank you