System.Data.ConstraintCollection.Clear C# (CSharp) Method

        public void Clear()
        {
            if (_table != null)
            {
                _table.PrimaryKey = null;

                for (int i = 0; i < _table.ParentRelations.Count; i++)
                {
                    _table.ParentRelations[i].SetChildKeyConstraint(null);
                }
                for (int i = 0; i < _table.ChildRelations.Count; i++)
                {
                    _table.ChildRelations[i].SetParentKeyConstraint(null);
                }
            }

            if (_table.fInitInProgress && _delayLoadingConstraints != null)
            {
                _delayLoadingConstraints = null;
                _fLoadForeignKeyConstraintsOnly = false;
            }

            int oldLength = List.Count;

            Constraint[] constraints = new Constraint[List.Count];
            List.CopyTo(constraints, 0);
            try
            {
                // this will smartly add and remove the appropriate tables.
                BaseGroupSwitch(constraints, oldLength, null, 0);
            }
            catch (Exception e) when (Common.ADP.IsCatchableOrSecurityExceptionType(e))
            {
                // something messed up.  restore to original state.
                BaseGroupSwitch(null, 0, constraints, oldLength);
                List.Clear();
                for (int i = 0; i < oldLength; i++)
                {
                    List.Add(constraints[i]);
                }
                throw;
            }

            List.Clear();
            OnCollectionChanged(s_refreshEventArgs);
        }