C# RelationCollection类代码示例

 /// <summary>Retrieves in the calling AuditActionCollection object all AuditActionEntity objects which are related via a relation of type 'm:n' with the passed in RoleEntity.</summary>
 /// <param name="containingTransaction">A containing transaction, if caller is added to a transaction, or null if not.</param>
 /// <param name="collectionToFill">Collection to fill with the entity objects retrieved</param>
 /// <param name="maxNumberOfItemsToReturn"> The maximum number of items to return with this retrieval query. When set to 0, no limitations are specified.</param>
 /// <param name="sortClauses">The order by specifications for the sorting of the resultset. When not specified, no sorting is applied.</param>
 /// <param name="entityFactoryToUse">The EntityFactory to use when creating entity objects during a GetMulti() call.</param>
 /// <param name="roleInstance">RoleEntity object to be used as a filter in the m:n relation</param>
 /// <param name="prefetchPathToUse">the PrefetchPath which defines the graph of objects to fetch.</param>
 /// <param name="pageNumber">The page number to retrieve.</param>
 /// <param name="pageSize">The page size of the page to retrieve.</param>
 /// <returns>true if succeeded, false otherwise</returns>
 public bool GetMultiUsingRolesWithAuditAction(ITransaction containingTransaction, IEntityCollection collectionToFill, long maxNumberOfItemsToReturn, ISortExpression sortClauses, IEntityFactory entityFactoryToUse, IEntity roleInstance, IPrefetchPath prefetchPathToUse, int pageNumber, int pageSize)
 {
     RelationCollection relations = new RelationCollection();
     relations.Add(AuditActionEntity.Relations.RoleAuditActionEntityUsingAuditActionID, "RoleAuditAction_");
     relations.Add(RoleAuditActionEntity.Relations.RoleEntityUsingRoleID, "RoleAuditAction_", string.Empty, JoinHint.None);
     IPredicateExpression selectFilter = new PredicateExpression();
     selectFilter.Add(new FieldCompareValuePredicate(roleInstance.Fields[(int)RoleFieldIndex.RoleID], ComparisonOperator.Equal));
     return this.GetMulti(containingTransaction, collectionToFill, maxNumberOfItemsToReturn, sortClauses, entityFactoryToUse, selectFilter, relations, prefetchPathToUse, pageNumber, pageSize);
 }

        public SelectList subjectAttributes(object selObjId)
        {
            if (m_subjectAttributes == null)
            {
                m_subjectAttributes = new AttributeCollection();
                RelationCollection rels = new RelationCollection(AttributeEntity.Relations.ContextEntityUsingContextId);
                PredicateExpression pe = new PredicateExpression(ContextFields.Name == "subject");
                SortExpression se = new SortExpression(AttributeFields.Name | SortOperator.Ascending);
                m_subjectAttributes.GetMulti(pe, 0, se, rels);
            }

            SelectList selList = new SelectList(m_subjectAttributes, "Id", "Name", selObjId);
            return selList;
        }

        public IList<Auction.Domain.Donor> GetByEvent(long eventId,
                                ref IAuctionTransaction trans)
        {
            using (var donors = new DonorCollection())
            {
                var relations = new RelationCollection {AuctionEventDonorEntity.Relations.DonorEntityUsingDonorId};
                var filter = new PredicateExpression { AuctionEventDonorFields.EventId == eventId };
                donors.GetMulti(filter, relations);

                return donors.Select(d => new Donor()
                {
                    Id = d.Id,
                    AccountId = d.AccountId,
                    Name = d.Name,
                    Notes = d.Notes,
                    Phone = d.Phone
                }).ToList();
            }
        }

        public Document[] GetLibraryDocuments(string libraryName)
        {
            List<Document> docs = new List<Document>();

            PolicyDocumentCollection policyDocuments = new PolicyDocumentCollection();

            RelationCollection rels = new RelationCollection(PolicyDocumentEntity.Relations.LibraryEntityUsingLibraryId);

            PredicateExpression pe = new PredicateExpression(LibraryFields.Name == libraryName);

            SortExpression se = new SortExpression(PolicyDocumentFields.Name | SortOperator.Ascending);
            policyDocuments.GetMulti(pe, 0, se, rels);

            foreach (PolicyDocumentEntity doc in policyDocuments)
            {
                Document wdoc = new Document();
                wdoc.Name = doc.Name;
                wdoc.Id = doc.Id;
                docs.Add(wdoc);
            }

            return docs.ToArray();
        }

 /// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
 /// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
 /// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
 internal static RelationCollection GetRelationsForField(string fieldName)
 {
     RelationCollection toReturn = new RelationCollection();
     switch(fieldName)
     {
         case "AspnetUser":
             toReturn.Add(Relations.AspnetUsersEntityUsingUserId);
             break;
         default:
             break;
     }
     return toReturn;
 }

		/// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
		/// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
		/// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
		internal static RelationCollection GetRelationsForField(string fieldName)
		{
			RelationCollection toReturn = new RelationCollection();
			switch(fieldName)
			{
				case "SalesPerson":
					toReturn.Add(Relations.SalesPersonEntityUsingSalesPersonId);
					break;
				default:
					break;				
			}
			return toReturn;
		}

		/// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
		/// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
		/// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
		internal static RelationCollection GetRelationsForField(string fieldName)
		{
			RelationCollection toReturn = new RelationCollection();
			switch(fieldName)
			{
				case "Address":
					toReturn.Add(Relations.AddressEntityUsingAddressId);
					break;
				case "AddressType":
					toReturn.Add(Relations.AddressTypeEntityUsingAddressTypeId);
					break;
				case "BusinessEntity":
					toReturn.Add(Relations.BusinessEntityEntityUsingBusinessEntityId);
					break;
				default:
					break;				
			}
			return toReturn;
		}

 /// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
 /// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
 /// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
 internal static RelationCollection GetRelationsForField(string fieldName)
 {
     RelationCollection toReturn = new RelationCollection();
     switch(fieldName)
     {
         case "AspnetApplications":
             toReturn.Add(Relations.AspnetApplicationsEntityUsingApplicationId);
             break;
         case "NewsCategoryParent":
             toReturn.Add(Relations.NewsCategoryEntityUsingIdNewsCategoryId);
             break;
         case "NewsCategoryChildrens":
             toReturn.Add(Relations.NewsCategoryEntityUsingNewsCategoryId);
             break;
         case "NewsCategoryInRoles":
             toReturn.Add(Relations.NewsCategoryInRoleEntityUsingNewsCategoryId);
             break;
         case "NewsCategoryLocalizations":
             toReturn.Add(Relations.NewsCategoryLocalizationEntityUsingNewsCategoryId);
             break;
         case "NewsItems":
             toReturn.Add(Relations.NewsItemEntityUsingNewsCategoryId);
             break;
         case "SnRelationshipss":
             toReturn.Add(Relations.SnRelationshipEntityUsingNewsCategoryId);
             break;
         case "NewsCategoryTemplate":
             toReturn.Add(Relations.NewsCategoryTemplateEntityUsingId);
             break;
         default:
             break;
     }
     return toReturn;
 }

		/// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
		/// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
		/// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
		internal static RelationCollection GetRelationsForField(string fieldName)
		{
			RelationCollection toReturn = new RelationCollection();
			switch(fieldName)
			{
				case "Contact":
					toReturn.Add(Relations.ContactEntityUsingContactId);
					break;
				case "Employee":
					toReturn.Add(Relations.EmployeeEntityUsingEmployeeIdManagerId);
					break;
				case "Employees":
					toReturn.Add(Relations.EmployeeEntityUsingManagerId);
					break;
				case "EmployeeAddresses":
					toReturn.Add(Relations.EmployeeAddressEntityUsingEmployeeId);
					break;
				case "EmployeeDepartmentHistories":
					toReturn.Add(Relations.EmployeeDepartmentHistoryEntityUsingEmployeeId);
					break;
				case "EmployeePayHistories":
					toReturn.Add(Relations.EmployeePayHistoryEntityUsingEmployeeId);
					break;
				case "JobCandidates":
					toReturn.Add(Relations.JobCandidateEntityUsingEmployeeId);
					break;
				case "PurchaseOrderHeaders":
					toReturn.Add(Relations.PurchaseOrderHeaderEntityUsingEmployeeId);
					break;
				case "SalesPerson":
					toReturn.Add(Relations.SalesPersonEntityUsingSalesPersonId);
					break;
				default:
					break;				
			}
			return toReturn;
		}

 /// <summary>
 /// Retrieves in the calling AccountCollection object all AccountEntity objects
 /// which are related via a relation of type 'm:n' with the passed in UserEntity. 
 /// </summary>
 /// <param name="containingTransaction">A containing transaction, if caller is added to a transaction, or null if not.</param>
 /// <param name="collectionToFill">Collection to fill with the entity objects retrieved</param>
 /// <param name="maxNumberOfItemsToReturn"> The maximum number of items to return with this retrieval query. 
 /// If the used Dynamic Query Engine supports it, 'TOP' is used to limit the amount of rows to return. When set to 0, no limitations are specified.</param>
 /// <param name="sortClauses">The order by specifications for the sorting of the resultset. When not specified, no sorting is applied.</param>
 /// <param name="entityFactoryToUse">The EntityFactory to use when creating entity objects during a GetMulti() call.</param>
 /// <param name="userInstance">UserEntity object to be used as a filter in the m:n relation</param>
 /// <param name="prefetchPathToUse">the PrefetchPath which defines the graph of objects to fetch.</param>
 /// <returns>true if succeeded, false otherwise</returns>
 public bool GetMultiUsingUserCollectionViaDonor_(ITransaction containingTransaction, IEntityCollection collectionToFill, long maxNumberOfItemsToReturn, ISortExpression sortClauses, IEntityFactory entityFactoryToUse, IEntity userInstance, IPrefetchPath prefetchPathToUse)
 {
     IEntityFields fieldsToReturn = EntityFieldsFactory.CreateEntityFieldsObject(Auction.Entities.EntityType.AccountEntity);
     RelationCollection relations = new RelationCollection();
     relations.Add(AccountEntity.Relations.DonorEntityUsingAccountId, "Donor_");
     relations.Add(DonorEntity.Relations.UserEntityUsingUpdatedBy, "Donor_", string.Empty, JoinHint.None);
     IPredicateExpression selectFilter = new PredicateExpression();
     selectFilter.Add(new FieldCompareValuePredicate(userInstance.Fields[(int)UserFieldIndex.Id], ComparisonOperator.Equal));
     return GetMulti(containingTransaction, collectionToFill, maxNumberOfItemsToReturn, sortClauses, entityFactoryToUse, selectFilter, relations, prefetchPathToUse);
 }

		/// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
		/// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
		/// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
		internal static RelationCollection GetRelationsForField(string fieldName)
		{
			RelationCollection toReturn = new RelationCollection();
			switch(fieldName)
			{
				case "ProductModel":
					toReturn.Add(Relations.ProductModelEntityUsingProductModelId);
					break;
				case "ProductSubcategory":
					toReturn.Add(Relations.ProductSubcategoryEntityUsingProductSubcategoryId);
					break;
				case "UnitMeasure":
					toReturn.Add(Relations.UnitMeasureEntityUsingSizeUnitMeasureCode);
					break;
				case "UnitMeasure_":
					toReturn.Add(Relations.UnitMeasureEntityUsingWeightUnitMeasureCode);
					break;
				case "BillOfMaterials":
					toReturn.Add(Relations.BillOfMaterialEntityUsingComponentId);
					break;
				case "BillOfMaterials_":
					toReturn.Add(Relations.BillOfMaterialEntityUsingProductAssemblyId);
					break;
				case "ProductCostHistories":
					toReturn.Add(Relations.ProductCostHistoryEntityUsingProductId);
					break;
				case "ProductDocuments":
					toReturn.Add(Relations.ProductDocumentEntityUsingProductId);
					break;
				case "ProductInventories":
					toReturn.Add(Relations.ProductInventoryEntityUsingProductId);
					break;
				case "ProductListPriceHistories":
					toReturn.Add(Relations.ProductListPriceHistoryEntityUsingProductId);
					break;
				case "ProductProductPhotos":
					toReturn.Add(Relations.ProductProductPhotoEntityUsingProductId);
					break;
				case "ProductReviews":
					toReturn.Add(Relations.ProductReviewEntityUsingProductId);
					break;
				case "ProductVendors":
					toReturn.Add(Relations.ProductVendorEntityUsingProductId);
					break;
				case "PurchaseOrderDetails":
					toReturn.Add(Relations.PurchaseOrderDetailEntityUsingProductId);
					break;
				case "ShoppingCartItems":
					toReturn.Add(Relations.ShoppingCartItemEntityUsingProductId);
					break;
				case "SpecialOfferProducts":
					toReturn.Add(Relations.SpecialOfferProductEntityUsingProductId);
					break;
				case "TransactionHistories":
					toReturn.Add(Relations.TransactionHistoryEntityUsingProductId);
					break;
				case "WorkOrders":
					toReturn.Add(Relations.WorkOrderEntityUsingProductId);
					break;
				default:
					break;				
			}
			return toReturn;
		}

 /// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
 /// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
 /// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
 internal static RelationCollection GetRelationsForField(string fieldName)
 {
     RelationCollection toReturn = new RelationCollection();
     switch(fieldName)
     {
         case "Person":
             toReturn.Add(Relations.PersonEntityUsingPersonId);
             break;
         case "ArtworkToRoles":
             toReturn.Add(Relations.ArtworkToRoleEntityUsingRoleId);
             break;
         case "RoleToEpisodes":
             toReturn.Add(Relations.RoleToEpisodeEntityUsingRoleId);
             break;
         case "RoleToSeasons":
             toReturn.Add(Relations.RoleToSeasonEntityUsingRoleId);
             break;
         case "RoleToSeries":
             toReturn.Add(Relations.RoleToSeriesEntityUsingRoleId);
             break;
         default:
             break;
     }
     return toReturn;
 }

 /// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
 /// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
 /// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
 internal static new RelationCollection GetRelationsForField(string fieldName)
 {
     RelationCollection toReturn = new RelationCollection();
     switch(fieldName)
     {
         case "Message":
             toReturn.Add(Relations.MessageEntityUsingMessageID);
             break;
         default:
             toReturn = AuditDataCoreEntity.GetRelationsForField(fieldName);
             break;
     }
     return toReturn;
 }

		/// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
		/// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
		/// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
		internal static RelationCollection GetRelationsForField(string fieldName)
		{
			RelationCollection toReturn = new RelationCollection();
			switch(fieldName)
			{
				case "CountryRegion":
					toReturn.Add(Relations.CountryRegionEntityUsingCountryRegionCode);
					break;
				case "Currency":
					toReturn.Add(Relations.CurrencyEntityUsingCurrencyCode);
					break;
				default:
					break;				
			}
			return toReturn;
		}

 /// <summary>Gets the relation objects which represent the relation the fieldName specified is mapped on. </summary>
 /// <param name="fieldName">Name of the field mapped onto the relation of which the relation objects have to be obtained.</param>
 /// <returns>RelationCollection with relation object(s) which represent the relation the field is maped on</returns>
 internal static RelationCollection GetRelationsForField(string fieldName)
 {
     RelationCollection toReturn = new RelationCollection();
     switch(fieldName)
     {
         case "ForumRoleForumActionRights":
             toReturn.Add(Relations.ForumRoleForumActionRightEntityUsingActionRightID);
             break;
         case "RoleSystemActionRights":
             toReturn.Add(Relations.RoleSystemActionRightEntityUsingActionRightID);
             break;
         case "SystemRightAssignedToRoles":
             toReturn.Add(Relations.RoleSystemActionRightEntityUsingActionRightID, "ActionRightEntity__", "RoleSystemActionRight_", JoinHint.None);
             toReturn.Add(RoleSystemActionRightEntity.Relations.RoleEntityUsingRoleID, "RoleSystemActionRight_", string.Empty, JoinHint.None);
             break;
         default:
             break;
     }
     return toReturn;
 }