System.Data.DataRelation.ValidateMultipleNestedRelations C# (CSharp) Метод

        internal void ValidateMultipleNestedRelations()
        {
            // find all nested relations that this child table has
            // if this relation is the only relation it has, then fine, 
            // otherwise check if all relations are created from XSD, without using Key/KeyRef
            // check all keys to see autogenerated

            if (!Nested || !CheckMultipleNested) // no need for this verification 
            {
                return;
            }

            if (0 < ChildTable.NestedParentRelations.Length)
            {
                DataColumn[] childCols = ChildColumns;
                if (childCols.Length != 1 || !IsAutoGenerated(childCols[0]))
                {
                    throw ExceptionBuilder.TableCantBeNestedInTwoTables(ChildTable.TableName);
                }

                if (!XmlTreeGen.AutoGenerated(this))
                {
                    throw ExceptionBuilder.TableCantBeNestedInTwoTables(ChildTable.TableName);
                }

                foreach (Constraint cs in ChildTable.Constraints)
                {
                    if (cs is ForeignKeyConstraint)
                    {
                        ForeignKeyConstraint fk = (ForeignKeyConstraint)cs;
                        if (!XmlTreeGen.AutoGenerated(fk, true))
                        {
                            throw ExceptionBuilder.TableCantBeNestedInTwoTables(ChildTable.TableName);
                        }
                    }
                    else
                    {
                        UniqueConstraint unique = (UniqueConstraint)cs;
                        if (!XmlTreeGen.AutoGenerated(unique))
                        {
                            throw ExceptionBuilder.TableCantBeNestedInTwoTables(ChildTable.TableName);
                        }
                    }
                }
            }
        }

        /// <summary>
        /// Does verification on the table.
        /// An ArgumentNullException is thrown if this relation is null.  An ArgumentException is thrown if this relation
        ///  already belongs to this collection, belongs to another collection.
        /// A DuplicateNameException is thrown if this collection already has a relation with the same
        /// name (case insensitive).
        /// </summary>
        protected virtual void AddCore(DataRelation relation)
        {
            DataCommonEventSource.Log.Trace("<ds.DataRelationCollection.AddCore|INFO> {0}, relation={1}", ObjectID, (relation != null) ? relation.ObjectID : 0);
            if (relation == null)
            {
                throw ExceptionBuilder.ArgumentNull(nameof(relation));
            }

            relation.CheckState();
            DataSet dataSet = GetDataSet();

            if (relation.DataSet == dataSet)
            {
                throw ExceptionBuilder.RelationAlreadyInTheDataSet();
            }
            if (relation.DataSet != null)
            {
                throw ExceptionBuilder.RelationAlreadyInOtherDataSet();
            }
            if (relation.ChildTable.Locale.LCID != relation.ParentTable.Locale.LCID ||
                relation.ChildTable.CaseSensitive != relation.ParentTable.CaseSensitive)
            {
                throw ExceptionBuilder.CaseLocaleMismatch();
            }

            if (relation.Nested)
            {
                relation.CheckNamespaceValidityForNestedRelations(relation.ParentTable.Namespace);
                relation.ValidateMultipleNestedRelations();
                relation.ParentTable.ElementColumnCount++;
            }
        }