コード例 #1
0
        public void RemoveItem(IGroupModel model, ITextOrGroupModel item)
        {
            string   parentName = model.GetName();
            Grouping parent     = _db.Groupings.FirstOrDefault(x => x.Name == parentName);

            if (parent == null)
            {
                throw new ArgumentException("Cannot add to group since the group does not exist.");
            }
            string   childName  = item.GetName();
            Text     childText  = _db.Texts.FirstOrDefault(x => x.Name == childName);
            Grouping childGroup = _db.Groupings.FirstOrDefault(x => x.Name == childName);

            if (childText == null)
            {
                if (childGroup == null)
                {
                    throw new ArgumentException("Cannot remove item from group since the item does not exist.");
                }
                Grouping_Grouping association = _db.Grouping_Grouping.FirstOrDefault(x => x.ParentId == parent.Id && x.ChildId == childGroup.Id);
                if (association == null)
                {
                    throw new ArgumentException("Cannot remove item from group since it is not a member of that group.");
                }
                _db.Grouping_Grouping.Remove(association);
                _db.SaveChanges();
            }
            else
            {
                if (childGroup != null)
                {
                    throw new InvalidOperationException("The database contains both a text and a group with the same name. That's not good.");
                }
                Text_Grouping assocation = _db.Text_Grouping.FirstOrDefault(x => x.TextId == childText.Id && x.GroupingId == parent.Id);
                if (assocation == null)
                {
                    throw new ArgumentException("Cannot remove item from group since it is not a member of that group.");
                }
                _db.Text_Grouping.Remove(assocation);
                _db.SaveChanges();
            }
        }
コード例 #2
0
        public void AddItem(IGroupModel model, ITextOrGroupModel item)
        {
            string   parentName = model.GetName();
            Grouping parent     = _db.Groupings.FirstOrDefault(x => x.Name == parentName);

            if (parent == null)
            {
                throw new ArgumentException("Cannot add to group since the group does not exist.");
            }
            string   childName  = item.GetName();
            Text     childText  = _db.Texts.FirstOrDefault(x => x.Name == childName);
            Grouping childGroup = _db.Groupings.FirstOrDefault(x => x.Name == childName);

            if (childText == null)
            {
                if (childGroup == null)
                {
                    throw new ArgumentException("Cannot add item to group since the item does not exist.");
                }
                if (childGroup.Id == parent.Id)
                {
                    throw new ArgumentException("Cannot add a group to itself.");
                }
                if (item is IGroupModel)
                {
                    if (Contains((IGroupModel)item, model))
                    {
                        throw new ArgumentException("Cannot add item to its own child or a child of its child or ...");
                    }
                }
                else
                {
                    throw new ArgumentException("The item's name corresponds to a group in the db, but the item is not a group model. Something is wrong.");
                }
                if (_db.Grouping_Grouping.Any(x => x.ParentId == parent.Id && x.ChildId == childGroup.Id))
                {
                    throw new ArgumentException("Cannot add item to group since it is already a member.");
                }
                Grouping_Grouping association = new Grouping_Grouping()
                {
                    ParentId = parent.Id, ChildId = childGroup.Id
                };
                _db.Grouping_Grouping.Add(association);
                _db.SaveChanges();
            }
            else
            {
                if (childGroup != null)
                {
                    throw new InvalidOperationException("The database contains both a text and a group with the same name. That's not good.");
                }
                if (_db.Text_Grouping.Any(x => x.TextId == childText.Id && x.GroupingId == parent.Id))
                {
                    throw new ArgumentException("Cannot add item to group since it is already a member.");
                }
                Text_Grouping assocation = new Text_Grouping()
                {
                    TextId = childText.Id, GroupingId = parent.Id
                };
                _db.Text_Grouping.Add(assocation);
                _db.SaveChanges();
            }
        }