C#, Silverlight/Telerik: HandleUserRoleControl

HandleUserRoleControl.cs

class Sample
{
    void HandleUserRoleControl(LightMessage<LightContentForFrameworkElement<UserRoleControl>> message)
    {
        var control = message.Content.Element;
        var data = message.Content.DataOfContext as SystemUser;
        Action loadGridView = () =>
        {
            if (control.GridView.HasItems) control.GridView.Items.Clear();
            var set = this._usersRoles.Where(i => i.UserId == data.UserId);
            set.ForEachInEnumerable(i => control.GridView.Items.Add(i));

            if (this._usersRolesCache != null) return;
            var setCopy = set.Select(i => i.GetDeepClone()).ToList();
            this._usersRolesCache = new List<SystemUserRole>(setCopy);
            control.GridHasChanges = false;
        };

        if (data == null) return;

        loadGridView();

        //support insert:
        control.GridView.AddingNewDataItem += (s, args) =>
        {
            args.NewObject = new SystemUserRole { UserId = (int)data.UserId };
        };
        control.GridView.RowEditEnded += (s, args) =>
        {
            if (args.EditAction != GridViewEditAction.Commit) return;
            if (args.EditOperationType != GridViewEditOperationType.Insert) return;
            if (args.NewData == null) return;

            var item = args.NewData as SystemUserRole;
            this._usersRoles.Add(item);

            control.GridHasChanges = true;
        };

        //support delete:
        if (control.GridViewEditCommandsColumn == null) return;
        control.GridViewEditCommandsColumn.ActionAfterDelete = rowData =>
        {
            var item = rowData as SystemUserRole;
            if (item == null) return;

            this._usersRoles.Remove(item);

            control.GridHasChanges = true;
        };

    }
}