System.Xml.XmlDataDocument.OnDataSetRelationsChanging C# (CSharp) Méthode

        private void OnDataSetRelationsChanging(object oRelationsCollection, CollectionChangeEventArgs args)
        {
            // args.Action is one of CollectionChangeAction.Add, CollectionChangeAction.Remove or CollectionChangeAction.Refresh
            // args.Element is a DataRelation

            // Disallow changing the tables collection if there is data loaded and there are nested relationship that are added/refreshed
            DataRelation rel = (DataRelation)(args.Element);
            if (rel != null && rel.Nested)
                throw new InvalidOperationException(SR.DataDom_DataSetNestedRelationsChange);

            // If Add and Remove, we should already been throwing if .Nested == false
            Debug.Assert(!(args.Action == CollectionChangeAction.Add || args.Action == CollectionChangeAction.Remove) || rel.Nested == false);
            if (args.Action == CollectionChangeAction.Refresh)
            {
                foreach (DataRelation relTemp in (DataRelationCollection)oRelationsCollection)
                {
                    if (relTemp.Nested)
                    {
                        throw new InvalidOperationException(SR.DataDom_DataSetNestedRelationsChange);
                    }
                }
            }
        }