/// <summary>
/// Adds or update group member's attributes using any page parameters that are attributes of the group.
/// </summary>
/// <param name="person">The person.</param>
/// <param name="group">The group.</param>
/// <param name="rockContext">The rock context.</param>
private void AddOrUpdateGroupMemberAttributes(Person person, Group group, RockContext rockContext)
{
var groupMember = group.Members.Where(m => m.PersonId == person.Id).FirstOrDefault();
AttributeService attributeService = new AttributeService(rockContext);
// Load all the group member attributes for comparison below.
var attributes = attributeService.GetGroupMemberAttributesCombined(group.Id, group.GroupTypeId);
// In order to add attributes to the person, you have to first load them all
groupMember.LoadAttributes(rockContext);
foreach (var entry in PageParameters())
{
// skip the parameter if the group's group type doesn't have that one
var attribute = attributes.Where(a => a.Key.Equals(entry.Key, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
if (attribute == null)
{
continue;
}
//attribute.SetAttributeValue
groupMember.SetAttributeValue(entry.Key, (string)entry.Value);
}
groupMember.SaveAttributeValues(rockContext);
}