GridGroupingControl Exception

[Mikaël Morvan]

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

[Administrator]

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

[Mikaël Morvan]

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

[Administrator]

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.

[Mikaël Morvan]

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

[Administrator]

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.

[Mikaël Morvan]

Thanks, it works fine.

[Administrator]

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