Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Filter / LookupNode.cs / 3 / 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); } // 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. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DiscoveryDocument.cs
- PresentationTraceSources.cs
- HttpDictionary.cs
- StrokeIntersection.cs
- DoubleAverageAggregationOperator.cs
- CssTextWriter.cs
- PrimitiveType.cs
- GenericIdentity.cs
- IntPtr.cs
- ExpressionVisitor.cs
- Stackframe.cs
- XmlUtilWriter.cs
- FuncCompletionCallbackWrapper.cs
- TransactionException.cs
- SoundPlayerAction.cs
- MobileFormsAuthentication.cs
- Literal.cs
- LocatorManager.cs
- FastEncoderWindow.cs
- IndexerNameAttribute.cs
- BuildResultCache.cs
- OdbcConnection.cs
- HtmlControlPersistable.cs
- UnsafeCollabNativeMethods.cs
- TriggerBase.cs
- NullRuntimeConfig.cs
- SQLGuidStorage.cs
- MenuScrollingVisibilityConverter.cs
- UpdatePanelControlTrigger.cs
- EditCommandColumn.cs
- IPipelineRuntime.cs
- DBCommand.cs
- HashAlgorithm.cs
- StylusDevice.cs
- PointHitTestParameters.cs
- DecoderExceptionFallback.cs
- CodeObject.cs
- BrowserDefinition.cs
- ACE.cs
- DataGridViewRowConverter.cs
- QueryAccessibilityHelpEvent.cs
- Variable.cs
- OledbConnectionStringbuilder.cs
- InfoCardProofToken.cs
- PropertyState.cs
- WinCategoryAttribute.cs
- CaretElement.cs
- ByteRangeDownloader.cs
- Geometry3D.cs
- Oid.cs
- FilterEventArgs.cs
- ObjectDataSourceSelectingEventArgs.cs
- SqlDataSourceEnumerator.cs
- HttpGetProtocolReflector.cs
- NavigatorOutput.cs
- OleDbWrapper.cs
- DataConnectionHelper.cs
- SamlSecurityTokenAuthenticator.cs
- ImageMapEventArgs.cs
- ContentElement.cs
- BamlLocalizerErrorNotifyEventArgs.cs
- DataControlFieldCollection.cs
- Setter.cs
- SafeHandle.cs
- OutputCacheProfile.cs
- ReflectionPermission.cs
- XsdValidatingReader.cs
- Form.cs
- WaitHandle.cs
- Help.cs
- ImageButton.cs
- RenderCapability.cs
- RelatedImageListAttribute.cs
- BoundingRectTracker.cs
- WebPageTraceListener.cs
- ExceptionHelpers.cs
- CompositeKey.cs
- BaseCAMarshaler.cs
- QilIterator.cs
- ImageCodecInfoPrivate.cs
- GCHandleCookieTable.cs
- TableLayoutPanelCodeDomSerializer.cs
- XmlAnyAttributeAttribute.cs
- SQLDateTime.cs
- GatewayIPAddressInformationCollection.cs
- List.cs
- SqlDataSourceSelectingEventArgs.cs
- EdmComplexPropertyAttribute.cs
- TimeSpanStorage.cs
- RootNamespaceAttribute.cs
- UmAlQuraCalendar.cs
- tooltip.cs
- SessionStateModule.cs
- EntityFrameworkVersions.cs
- LateBoundBitmapDecoder.cs
- GAC.cs
- ComponentEditorForm.cs
- ScriptingProfileServiceSection.cs
- SqlCommandBuilder.cs
- StrokeCollectionDefaultValueFactory.cs