/// <summary>
/// Adds the specified associated entities to the specified association member for the specified entity.
/// </summary>
/// <param name="entity">The entity</param>
/// <param name="associationProperty">The association member (singleton or collection)</param>
/// <param name="associatedEntities">Collection of associated entities</param>
private static void SetAssociationMember(object entity, PropertyDescriptor associationProperty, IEnumerable <object> associatedEntities)
{
if (associatedEntities.Count() == 0)
{
return;
}
object associationValue = associationProperty.GetValue(entity);
if (typeof(IEnumerable).IsAssignableFrom(associationProperty.PropertyType))
{
if (associationValue == null)
{
throw Error.InvalidOperation(Resource.DataController_AssociationCollectionPropertyIsNull, associationProperty.ComponentType.Name, associationProperty.Name);
}
IList list = associationValue as IList;
IEnumerable <object> associationSequence = null;
MethodInfo addMethod = null;
if (list == null)
{
// not an IList, so we have to use reflection
Type associatedEntityType = TypeUtility.GetElementType(associationValue.GetType());
addMethod = associationValue.GetType().GetMethod("Add", BindingFlags.Public | BindingFlags.Instance, null, new Type[] { associatedEntityType }, null);
if (addMethod == null)
{
throw Error.InvalidOperation(Resource.DataController_InvalidCollectionMember, associationProperty.Name);
}
associationSequence = ((IEnumerable)associationValue).Cast <object>();
}
foreach (object associatedEntity in associatedEntities)
{
// add the entity to the collection if it's not already there
if (list != null)
{
if (!list.Contains(associatedEntity))
{
list.Add(associatedEntity);
}
}
else
{
if (!associationSequence.Contains(associatedEntity))
{
addMethod.Invoke(associationValue, new object[] { associatedEntity });
}
}
}
}
else
{
// set the reference if it's not already set
object associatedEntity = associatedEntities.Single();
object currentValue = associationProperty.GetValue(entity);
if (!Object.Equals(currentValue, associatedEntity))
{
associationProperty.SetValue(entity, associatedEntity);
}
}
}