GridViewCustomPropertyProvider support for Grouping by property not Column

[Steve]

Hi all,
I ran into a situation where I programmatically grouped my Grid by a property that was not a column on the Grid using a GroupDescriptor.  It worked fine of course until I tried to persist it.  The GridViewCustomPropertyProvider.cs that I downloaded from Telerik many moons ago expected ColumnGroupDescriptors only.  After some investigation I found that I had to make modifications to support both types.  I share the code here in case someone else also needs this support.

In the ProvideValue method...

case "GroupDescriptors":
    {
        List<GroupDescriptorProxy> groupDescriptorProxies = new List<GroupDescriptorProxy>();

        foreach (GroupDescriptorBase descriptor in gridView.GroupDescriptors)
        {
            if (descriptor is GroupDescriptor)
            {
                groupDescriptorProxies.Add(new GroupDescriptorProxy()
                {
                    ColumnUniqueName = (descriptor as GroupDescriptor).Member,
                    SortDirection = descriptor.SortDirection,
                });
            }
            else if (descriptor is ColumnGroupDescriptor)
            {
                groupDescriptorProxies.Add(new GroupDescriptorProxy()
                {
                    ColumnUniqueName = (descriptor as ColumnGroupDescriptor).Column.UniqueName,
                    SortDirection = descriptor.SortDirection,
                });
            }

        }

        return groupDescriptorProxies;
    }

In the RestoreValueMethod....

case "GroupDescriptors":
    {
        gridView.GroupDescriptors.SuspendNotifications();

        gridView.GroupDescriptors.Clear();

        List<GroupDescriptorProxy> groupDescriptorProxies = value as List<GroupDescriptorProxy>;

        foreach (GroupDescriptorProxy proxy in groupDescriptorProxies)
        {
            GridViewColumn column = gridView.Columns[proxy.ColumnUniqueName];
            GroupDescriptorBase gd = null;
            if (column != null)
            {
                gd = new ColumnGroupDescriptor()
                {
                    Column = column,
                    SortDirection = proxy.SortDirection
                };
            }
            else // assume GroupDescriptor
            {
                gd = new GroupDescriptor()
                {
                    Member = proxy.ColumnUniqueName,
                    SortDirection = proxy.SortDirection
                };
            }
            gridView.GroupDescriptors.Add(gd);
        }

        gridView.GroupDescriptors.ResumeNotifications();
    }

Best,
Steve

[Yoan]

Hi Steve,

I am glad to hear that you have solved your problem. Thank you for sharing your solution to the community. 

Regards,
Yoan
Telerik