public virtual Net.Vpc.Upa.Expressions.Expression CreateFindEntityByMainPathExpression(string mainFieldPath, string entityAlias) { Net.Vpc.Upa.Entity entity = GetEntity(); Net.Vpc.Upa.RelationshipRole detailRole = GetTreeRelationship().GetSourceRole(); if (Net.Vpc.Upa.Impl.Util.StringUtils.IsNullOrEmpty(mainFieldPath)) { return(null); } string mainFieldName = entity.GetMainField().GetName(); object mainFieldValue = null; object parent = null; string[] parentAndName = Net.Vpc.Upa.Impl.Util.StringUtils.Split(mainFieldPath, GetHierarchyPathSeparator()[0], false); if (parentAndName != null) { parent = FindEntityByMainPath(parentAndName[0]); mainFieldValue = parentAndName[1]; } else { mainFieldValue = mainFieldPath; } Net.Vpc.Upa.Expressions.Expression expr = null; if (entityAlias == null) { entityAlias = entity.GetName(); } expr = new Net.Vpc.Upa.Expressions.Equals(new Net.Vpc.Upa.Expressions.Var(new Net.Vpc.Upa.Expressions.Var(entityAlias), mainFieldName), mainFieldValue); Net.Vpc.Upa.Key entityToKey = parent == null ? null : entity.GetBuilder().ObjectToKey(parent); System.Collections.Generic.IList <Net.Vpc.Upa.Field> primaryFields = detailRole.GetFields(); for (int index = 0; index < (primaryFields).Count; index++) { Net.Vpc.Upa.Field field = primaryFields[index]; expr = new Net.Vpc.Upa.Expressions.And(expr, new Net.Vpc.Upa.Expressions.Equals(new Net.Vpc.Upa.Expressions.Var(new Net.Vpc.Upa.Expressions.Var(entityAlias), field.GetName()), entityToKey == null ? null : entityToKey.GetObjectAt(index))); } return(expr); }