C# PredicateExpression.AddWithOr方法代码示例

        /// <summary>
        /// Za svaki član this.rules kolekcije kreira jedan Predicate.
        /// Ako je rules.Count == 0 vraća NULL
        /// </summary>
        /// <returns>PredicateExpression</returns>
        /// <param name="entityFieldsType">Ako se filtrira artikl onda typeof(ArtiklFields)</param>
		/// <param name="getEntityFieldTypeFunction">Funkcija prima string (EntityFields type name) a vraća tip. Ako se desi da se filtrira po entitetu vezanom na glavni entitet (RacunGlava.Partner) tada se koristi ova funkcija za dohvat EntityFieldsType preko refleksije.</param>
		public PredicateExpression KreirajPredicate(Type entityFieldsType, 
                                            Func<string, Type> getEntityFieldTypeFunction)
        {
            PredicateExpression toReturn = null;

            if (rules.Count() > 0)
            {
                toReturn = new PredicateExpression();

                foreach (JqGridFilterItem item in rules)
                {
                    Predicate predicateToAdd = JqGridFilter.KreirajPredikatIzJqGridFilterItem(entityFieldsType, item, getEntityFieldTypeFunction);
                    
                    if (predicateToAdd != null)
                    {
                        if (groupOp.ToUpper() == "AND")
                        {
                            toReturn.AddWithAnd(predicateToAdd);
                        }
                        else if (groupOp.ToUpper() == "OR")
                        {
                            toReturn.AddWithOr(predicateToAdd);
                        }
                    }
                }
            }

            return toReturn;
        }

        private static IPredicate BuildPredicateTree(Func<string, IEntityField2> fieldGetter, Func<string, List<IEntityRelation>, IEntityField2> relatedFieldGetter, FilterNode filterNode, List<IEntityRelation> inferredRelationsList)
        {
            if (filterNode.NodeCount > 0)
            {
                if (filterNode.NodeType == FilterNodeType.Root && filterNode.Nodes.Count > 0)
                {
                    if (filterNode.NodeCount == 1)
                        return BuildPredicateTree(fieldGetter, relatedFieldGetter, filterNode.Nodes[0], inferredRelationsList);

                    var predicate = new PredicateExpression();
                    foreach (var childNode in filterNode.Nodes)
                    {
                        var newPredicate = BuildPredicateTree(fieldGetter, relatedFieldGetter, childNode, inferredRelationsList);
                        if (newPredicate != null)
                            predicate.AddWithAnd(newPredicate);
                    }
                    return predicate;
                }
                else if (filterNode.NodeType == FilterNodeType.AndExpression ||
                    filterNode.NodeType == FilterNodeType.OrExpression)
                {
                    var predicate = new PredicateExpression();
                    foreach (var childNode in filterNode.Nodes)
                    {
                        var newPredicate = BuildPredicateTree(fieldGetter, relatedFieldGetter, childNode, inferredRelationsList);
                        if (newPredicate != null)
                        {
                            if (filterNode.NodeType == FilterNodeType.OrExpression)
                                predicate.AddWithOr(newPredicate);
                            else
                                predicate.AddWithAnd(newPredicate);
                        }
                    }
                    return predicate;
                }
            }
            else if (filterNode.ElementCount > 0)
            {
                // convert elements to IPredicate
                var nodePredicate = BuildPredicateFromClauseNode(fieldGetter, relatedFieldGetter, filterNode, inferredRelationsList);
                if (nodePredicate != null)
                    return nodePredicate;
            }
            return null;
        }

        /// <summary>
        /// Does the search using MS Full text search
        /// </summary>
        /// <param name="searchString">Search string.</param>
        /// <param name="forumIDs">Forum Ids of forums to search into.</param>
        /// <param name="orderFirstElement">Order first element setting.</param>
        /// <param name="orderSecondElement">Order second element setting.</param>
        /// <param name="forumsWithThreadsFromOthers">The forums with threads from others.</param>
        /// <param name="userID">The userid of the calling user.</param>
        /// <param name="targetToSearch">The target to search.</param>
        /// <returns>
        /// TypedList filled with threads matching the query.
        /// </returns>
        public static SearchResultTypedList DoSearch(string searchString, List<int> forumIDs, SearchResultsOrderSetting orderFirstElement,
            SearchResultsOrderSetting orderSecondElement, List<int> forumsWithThreadsFromOthers, int userID, SearchTarget targetToSearch)
        {
            // the search utilizes full text search. It performs a CONTAINS upon the MessageText field of the Message entity.
            string searchTerms = PrepareSearchTerms(searchString);
            bool searchMessageText = (targetToSearch == SearchTarget.MessageText) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
            bool searchSubject = (targetToSearch == SearchTarget.ThreadSubject) || (targetToSearch == SearchTarget.MessageTextAndThreadSubject);
            if(!(searchSubject || searchMessageText))
            {
                // no target specified, select message
                searchMessageText = true;
            }

            PredicateExpression searchTermFilter = new PredicateExpression();
            if(searchMessageText)
            {
                // Message contents filter
                searchTermFilter.Add(new FieldCompareSetPredicate(ThreadFields.ThreadID, MessageFields.ThreadID,
                                    SetOperator.In, new FieldFullTextSearchPredicate(MessageFields.MessageText, FullTextSearchOperator.Contains, searchTerms)));
            }
            if(searchSubject)
            {
                // Thread subject filter
                if(searchMessageText)
                {
                    searchTermFilter.AddWithOr(new FieldFullTextSearchPredicate(ThreadFields.Subject, FullTextSearchOperator.Contains, searchTerms));
                }
                else
                {
                    searchTermFilter.Add(new FieldFullTextSearchPredicate(ThreadFields.Subject, FullTextSearchOperator.Contains, searchTerms));
                }
            }
            IPredicateExpression mainFilter = searchTermFilter
                                                    .And(ForumFields.ForumID == forumIDs)
                                                    .And(ThreadGuiHelper.CreateThreadFilter(forumsWithThreadsFromOthers, userID));

            ISortExpression sorter = new SortExpression();
            // add first element
            sorter.Add(CreateSearchSortClause(orderFirstElement));
            if(orderSecondElement != orderFirstElement)
            {
                sorter.Add(CreateSearchSortClause(orderSecondElement));
            }

            SearchResultTypedList results = new SearchResultTypedList(false);

            try
            {
                // get the data from the db.
                results.Fill(500, sorter, false, mainFilter);
            }
            catch
            {
                // probably an error with the search words / user error. Swallow for now, which will result in an empty resultset.
            }

            return results;
        }

		/// <summary>
		/// Creates the thread filter. Filters on the threads viewable by the passed in userid, which is the caller of the method. 
		/// If a forum isn't in the list of forumsWithThreadsFromOthers, only the sticky threads and the threads started by userid should 
		/// be counted / taken into account. 
		/// </summary>
		/// <param name="forumsWithThreadsFromOthers">The forums with threads from others.</param>
		/// <param name="userID">The user ID.</param>
		/// <returns>ready to use thread filter.</returns>
		internal static IPredicateExpression CreateThreadFilter(List<int> forumsWithThreadsFromOthers, int userID)
		{
			var threadFilter = new PredicateExpression();
			if((forumsWithThreadsFromOthers != null) && (forumsWithThreadsFromOthers.Count > 0))
			{
				PredicateExpression onlyOwnThreadsFilter = new PredicateExpression();

				// accept only those threads who aren't in the forumsWithThreadsFromOthers list and which are either started by userID or sticky.
				// the filter on the threads not in the forums listed in the forumsWithThreadsFromOthers
				if(forumsWithThreadsFromOthers.Count == 1)
				{
					// optimization, specify the only value instead of the range, so we won't get a WHERE Field IN (@param) query which is slow on some
					// databases, but we'll get a WHERE Field == @param
					// accept all threads which are in a forum located in the forumsWithThreadsFromOthers list 
					threadFilter.Add((ThreadFields.ForumID == forumsWithThreadsFromOthers[0]));
					onlyOwnThreadsFilter.Add(ThreadFields.ForumID != forumsWithThreadsFromOthers[0]);
				}
				else
				{
					// accept all threads which are in a forum located in the forumsWithThreadsFromOthers list 
					threadFilter.Add((ThreadFields.ForumID == forumsWithThreadsFromOthers));
					onlyOwnThreadsFilter.Add(ThreadFields.ForumID != forumsWithThreadsFromOthers);
				}
				// the filter on either sticky or threads started by the calling user
				onlyOwnThreadsFilter.AddWithAnd((ThreadFields.IsSticky == true).Or(ThreadFields.StartedByUserID == userID));
				threadFilter.AddWithOr(onlyOwnThreadsFilter);
			}
			else
			{
				// there are no forums enlisted in which the user has the right to view threads from others. So just filter on
				// sticky threads or threads started by the calling user.
				threadFilter.Add((ThreadFields.IsSticky == true).Or(ThreadFields.StartedByUserID == userID));
			}
			return threadFilter;
		}

        private static bool DeletePolicyFromLib(int id)
        {
            PredicateExpression pe = new PredicateExpression(PolicyLinkFields.PolicyId == id);
            PredicateExpression peOr = new PredicateExpression(new FieldCompareSetPredicate(PolicyLinkFields.Id, PolicyDocumentFields.PolicyLinkId, SetOperator.In, null));
            peOr.AddWithOr(PolicyLinkFields.ParentId != DBNull.Value);
            pe.Add(peOr);

            PolicyLinkCollection plcoll = new PolicyLinkCollection();
            if (plcoll.GetMulti(pe) && plcoll.Count == 0)
            {
                // Policy isn't referenced in any policy document.
                PolicyEntity delPolicy = new PolicyEntity(id);
                delPolicy.PolicyLink.DeleteMulti();

                DeletePolicy(delPolicy);

                return true;
            }
            else
                return false;
        }