Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Filter / LookupNode.cs / 1305376 / LookupNode.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data { using System; using System.ComponentModel; using System.Collections.Generic; using System.Diagnostics; internal sealed class LookupNode : ExpressionNode { private readonly string relationName; // can be null private readonly string columnName; private DataColumn column; private DataRelation relation; internal LookupNode(DataTable table, string columnName, string relationName) : base(table) { this.relationName = relationName; this.columnName = columnName; } internal override void Bind(DataTable table, Listlist) { BindTable(table); column = null; // clear for rebinding (if original binding was valid) relation = null; if (table == null) throw ExprException.ExpressionUnbound(this.ToString()); // First find parent table DataRelationCollection relations; relations = table.ParentRelations; if (relationName == null) { // must have one and only one relation if (relations.Count > 1) { throw ExprException.UnresolvedRelation(table.TableName, this.ToString()); } relation = relations[0]; } else { relation = relations[relationName]; } if (null == relation) { throw ExprException.BindFailure(relationName);// WebData 112162: this operation is not clne specific, throw generic exception } DataTable parentTable = relation.ParentTable; Debug.Assert(relation != null, "Invalid relation: no parent table."); Debug.Assert(columnName != null, "All Lookup expressions have columnName set."); this.column = parentTable.Columns[columnName]; if (column == null) throw ExprException.UnboundName(columnName); // add column to the dependency list int i; for (i = 0; i < list.Count; i++) { // walk the list, check if the current column already on the list DataColumn dataColumn = list[i]; if (column == dataColumn) { break; } } if (i >= list.Count) { list.Add(column); } // SQLBU 383715: Staleness of computed values in expression column as the relationship end columns are not being added to the dependent column list. AggregateNode.Bind(relation, list); } internal override object Eval() { throw ExprException.EvalNoContext(); } internal override object Eval(DataRow row, DataRowVersion version) { if (column == null || relation == null) throw ExprException.ExpressionUnbound(this.ToString()); DataRow parent = row.GetParentRow(relation, version); if (parent == null) return DBNull.Value; return parent[column, parent.HasVersion(version) ? version : DataRowVersion.Current]; // [....] : Bug 76154 } internal override object Eval(int[] recordNos) { throw ExprException.ComputeNotAggregate(this.ToString()); } internal override bool IsConstant() { return false; } internal override bool IsTableConstant() { return false; } internal override bool HasLocalAggregate() { return false; } internal override bool HasRemoteAggregate() { return false; } internal override bool DependsOn(DataColumn column) { if (this.column == column) { return true; } return false; } internal override ExpressionNode Optimize() { return this; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- oledbconnectionstring.cs
- Module.cs
- TransformerConfigurationWizardBase.cs
- WebServiceParameterData.cs
- PartialCachingAttribute.cs
- BrowserDefinitionCollection.cs
- PackageDigitalSignatureManager.cs
- TextDecorations.cs
- ControlBuilder.cs
- DataColumnPropertyDescriptor.cs
- RegexRunnerFactory.cs
- PrtCap_Builder.cs
- SqlDataSourceCustomCommandEditor.cs
- XPathAxisIterator.cs
- TdsParserSessionPool.cs
- MetadataItemSerializer.cs
- WebPartDeleteVerb.cs
- EventLogPermissionEntry.cs
- URLMembershipCondition.cs
- PropertyNames.cs
- NGCPageContentSerializerAsync.cs
- Frame.cs
- ScriptControl.cs
- FastEncoderWindow.cs
- CodeTypeDeclarationCollection.cs
- CodeExpressionStatement.cs
- DataServiceConfiguration.cs
- ContentType.cs
- WindowsHyperlink.cs
- SqlInfoMessageEvent.cs
- TableHeaderCell.cs
- RectangleF.cs
- VisualBrush.cs
- EditorPartDesigner.cs
- CodeAccessSecurityEngine.cs
- pingexception.cs
- FieldMetadata.cs
- FormatterServicesNoSerializableCheck.cs
- GeneralTransform3D.cs
- ProviderSettings.cs
- ReadOnlyMetadataCollection.cs
- _ContextAwareResult.cs
- HandleExceptionArgs.cs
- TreeViewHitTestInfo.cs
- FixedSOMPageConstructor.cs
- BoundingRectTracker.cs
- AnimatedTypeHelpers.cs
- TriggerAction.cs
- ContextMarshalException.cs
- CodeTypeDelegate.cs
- PropertySet.cs
- ImageMap.cs
- ScaleTransform3D.cs
- CodeMemberEvent.cs
- SecurityTokenParameters.cs
- SQLDecimalStorage.cs
- WpfWebRequestHelper.cs
- IOThreadScheduler.cs
- Aes.cs
- CompilationRelaxations.cs
- CachedTypeface.cs
- WindowsFormsHost.cs
- ListenUriMode.cs
- BinaryNode.cs
- _NetRes.cs
- StagingAreaInputItem.cs
- SQLResource.cs
- Debug.cs
- MoveSizeWinEventHandler.cs
- TreeNode.cs
- CheckedListBox.cs
- CodeComment.cs
- InvalidWMPVersionException.cs
- HttpCachePolicyElement.cs
- QueryCacheManager.cs
- WebHttpBindingElement.cs
- OptimalTextSource.cs
- SerializationFieldInfo.cs
- SystemFonts.cs
- ServiceTimeoutsElement.cs
- Durable.cs
- TryExpression.cs
- PointLightBase.cs
- MethodImplAttribute.cs
- Sql8ConformanceChecker.cs
- DataKeyArray.cs
- SmiContextFactory.cs
- TypeSystemProvider.cs
- InsufficientMemoryException.cs
- SystemWebSectionGroup.cs
- ConfigXmlCDataSection.cs
- ServiceOperation.cs
- SoapSchemaImporter.cs
- ToolStripItemClickedEventArgs.cs
- Operand.cs
- CollectionConverter.cs
- ViewLoader.cs
- TileBrush.cs
- UInt64Converter.cs
- TextLineBreak.cs