Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Common / FieldNameLookup.cs / 1305376 / FieldNameLookup.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- #if SYSTEM_DATA_ENTITY namespace System.Data { #else // !SYSTEM_DATA_ENTITY namespace System.Data.ProviderBase { #endif // !SYSTEM_DATA_ENTITY using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Data.Common; using System.Diagnostics; using System.Globalization; using System.Text; internal sealed class FieldNameLookup { // V1.2.3300, MDAC 69015, 71470 // hashtable stores the index into the _fieldNames, match via case-sensitive private Hashtable _fieldNameLookup; // original names for linear searches when exact matches fail private string[] _fieldNames; // if _defaultLocaleID is -1 then _compareInfo is initialized with InvariantCulture CompareInfo // otherwise it is specified by the server? for the correct compare info private CompareInfo _compareInfo; private int _defaultLocaleID; #if !ORACLE && !SYSTEM_DATA_ENTITY public FieldNameLookup(string[] fieldNames, int defaultLocaleID) { // V1.2.3300 if (null == fieldNames) { throw ADP.ArgumentNull("fieldNames"); } _fieldNames = fieldNames; _defaultLocaleID = defaultLocaleID; } #endif #if !ORACLE public FieldNameLookup(System.Collections.ObjectModel.ReadOnlyCollectioncolumnNames, int defaultLocaleID) { int length = columnNames.Count; string[] fieldNames = new string[length]; for (int i = 0; i < length; ++i) { fieldNames[i] = columnNames[i]; Debug.Assert(null != fieldNames[i], "MDAC 66681"); } _fieldNames = fieldNames; _defaultLocaleID = defaultLocaleID; GenerateLookup(); } #endif public FieldNameLookup(IDataRecord reader, int defaultLocaleID) { // V1.2.3300 int length = reader.FieldCount; string[] fieldNames = new string[length]; for (int i = 0; i < length; ++i) { fieldNames[i] = reader.GetName(i); Debug.Assert(null != fieldNames[i], "MDAC 66681"); } _fieldNames = fieldNames; _defaultLocaleID = defaultLocaleID; } public int GetOrdinal(string fieldName) { // V1.2.3300 if (null == fieldName) { throw ADP.ArgumentNull("fieldName"); } int index = IndexOf(fieldName); if (-1 == index) { throw ADP.IndexOutOfRange(fieldName); } return index; } #if !ORACLE && !SYSTEM_DATA_ENTITY public int IndexOfName(string fieldName) { // V1.2.3300 if (null == _fieldNameLookup) { GenerateLookup(); } // via case sensitive search, first match with lowest ordinal matches object value = _fieldNameLookup[fieldName]; return ((null != value) ? (int) value : -1); } #endif public int IndexOf(string fieldName) { // V1.2.3300 if (null == _fieldNameLookup) { GenerateLookup(); } int index; object value = _fieldNameLookup[fieldName]; if (null != value) { // via case sensitive search, first match with lowest ordinal matches index = (int) value; } else { // via case insensitive search, first match with lowest ordinal matches index = LinearIndexOf(fieldName, CompareOptions.IgnoreCase); if (-1 == index) { // do the slow search now (kana, width insensitive comparison) index = LinearIndexOf(fieldName, ADP.compareOptions); } } return index; } private int LinearIndexOf(string fieldName, CompareOptions compareOptions) { CompareInfo compareInfo = _compareInfo; if (null == compareInfo) { if (-1 != _defaultLocaleID) { compareInfo = CompareInfo.GetCompareInfo(_defaultLocaleID); } if (null == compareInfo) { compareInfo = CultureInfo.InvariantCulture.CompareInfo; } _compareInfo = compareInfo; } int length = _fieldNames.Length; for (int i = 0; i < length; ++i) { if (0 == compareInfo.Compare(fieldName, _fieldNames[i], compareOptions)) { _fieldNameLookup[fieldName] = i; // add an exact match for the future return i; } } return -1; } // RTM common code for generating Hashtable from array of column names private void GenerateLookup() { int length = _fieldNames.Length; Hashtable hash = new Hashtable(length); // via case sensitive search, first match with lowest ordinal matches for (int i = length-1; 0 <= i; --i) { string fieldName = _fieldNames[i]; hash[fieldName] = i; } _fieldNameLookup = hash; } } } // 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
- CodeSubDirectory.cs
- X509CertificateTrustedIssuerElement.cs
- InvalidOleVariantTypeException.cs
- shaperfactory.cs
- DataMemberFieldEditor.cs
- Border.cs
- NullableBoolConverter.cs
- RequiredFieldValidator.cs
- UserPersonalizationStateInfo.cs
- OleDbConnectionInternal.cs
- streamingZipPartStream.cs
- OleDbDataAdapter.cs
- DataSetFieldSchema.cs
- DataGridViewLinkCell.cs
- CopyNodeSetAction.cs
- EntitySqlQueryBuilder.cs
- OleDbErrorCollection.cs
- WindowsListViewScroll.cs
- ReplacementText.cs
- Graph.cs
- ValuePattern.cs
- ReliabilityContractAttribute.cs
- ToolboxService.cs
- InterleavedZipPartStream.cs
- TreeNodeMouseHoverEvent.cs
- LogicalExpr.cs
- DataPagerFieldItem.cs
- PrimaryKeyTypeConverter.cs
- WorkBatch.cs
- ProviderUtil.cs
- ping.cs
- MoveSizeWinEventHandler.cs
- RepeatButton.cs
- LogEntryHeaderDeserializer.cs
- RenderingBiasValidation.cs
- HttpRequest.cs
- FieldAccessException.cs
- FormatControl.cs
- XmlILModule.cs
- HybridCollection.cs
- DataGridSortCommandEventArgs.cs
- GuidelineCollection.cs
- DataGridViewButtonCell.cs
- UserControl.cs
- WebPartZoneBase.cs
- LinqMaximalSubtreeNominator.cs
- DataRowView.cs
- ColumnCollection.cs
- WindowsFormsDesignerOptionService.cs
- GridViewRow.cs
- WebPartDisplayModeCollection.cs
- ImageBrush.cs
- HealthMonitoringSectionHelper.cs
- PathFigureCollectionConverter.cs
- SolidColorBrush.cs
- _NativeSSPI.cs
- RuntimeWrappedException.cs
- XmlDataSourceNodeDescriptor.cs
- SystemEvents.cs
- SyndicationSerializer.cs
- HttpProfileGroupBase.cs
- ToolBarButtonDesigner.cs
- SymDocumentType.cs
- FrameworkContentElement.cs
- __TransparentProxy.cs
- SqlClientMetaDataCollectionNames.cs
- XhtmlBasicTextBoxAdapter.cs
- PopOutPanel.cs
- EnumConverter.cs
- ScrollViewer.cs
- _BaseOverlappedAsyncResult.cs
- DispatcherExceptionFilterEventArgs.cs
- TimeSpanMinutesConverter.cs
- MulticastOption.cs
- SafeRegistryHandle.cs
- ProcessProtocolHandler.cs
- StringFormat.cs
- _CacheStreams.cs
- Rect3DConverter.cs
- ListItemCollection.cs
- GenerateHelper.cs
- PenThreadPool.cs
- UnmanagedBitmapWrapper.cs
- BamlResourceContent.cs
- TemplateControlCodeDomTreeGenerator.cs
- XmlConvert.cs
- StateMachineWorkflowDesigner.cs
- XmlDocumentType.cs
- WindowsComboBox.cs
- PointAnimationUsingKeyFrames.cs
- TCPClient.cs
- SymbolType.cs
- SerialReceived.cs
- Set.cs
- RevocationPoint.cs
- PrinterResolution.cs
- ProtocolsConfigurationHandler.cs
- FactoryGenerator.cs
- AssemblyBuilderData.cs
- AsyncCompletedEventArgs.cs