System.Data.ConstraintCollection.BaseRemove C# (CSharp) Метод

        private void BaseRemove(Constraint constraint)
        {
            if (constraint == null)
            {
                throw ExceptionBuilder.ArgumentNull(nameof(constraint));
            }
            if (constraint.Table != _table)
            {
                throw ExceptionBuilder.ConstraintRemoveFailed();
            }

            UnregisterName(constraint.ConstraintName);
            constraint.InCollection = false;

            if (constraint is UniqueConstraint)
            {
                for (int i = 0; i < Table.ChildRelations.Count; i++)
                {
                    DataRelation rel = Table.ChildRelations[i];
                    if (rel.ParentKeyConstraint == constraint)
                        rel.SetParentKeyConstraint(null);
                }
                ((UniqueConstraint)constraint).ConstraintIndexClear();
            }
            else if (constraint is ForeignKeyConstraint)
            {
                for (int i = 0; i < Table.ParentRelations.Count; i++)
                {
                    DataRelation rel = Table.ParentRelations[i];
                    if (rel.ChildKeyConstraint == constraint)
                        rel.SetChildKeyConstraint(null);
                }
            }
        }