Example #1
0
        /// <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);
                }
            }
        }