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
- RSAPKCS1KeyExchangeFormatter.cs
- ADConnectionHelper.cs
- Viewport3DAutomationPeer.cs
- SwitchLevelAttribute.cs
- DataGridViewDataErrorEventArgs.cs
- OleDbInfoMessageEvent.cs
- DescendentsWalker.cs
- ConfigXmlReader.cs
- ClockController.cs
- GridViewCancelEditEventArgs.cs
- PopupControlService.cs
- ZoneButton.cs
- SizeConverter.cs
- ColorConvertedBitmapExtension.cs
- HashAlgorithm.cs
- ErrorWrapper.cs
- EntityDataSourceConfigureObjectContext.cs
- TabControl.cs
- SafeFileMappingHandle.cs
- ResXResourceReader.cs
- XmlAttributeCollection.cs
- WindowsImpersonationContext.cs
- ConnectionStringSettings.cs
- MLangCodePageEncoding.cs
- WebPartConnectionsConfigureVerb.cs
- HeaderUtility.cs
- WsatProxy.cs
- DataGridRowEventArgs.cs
- GeometryValueSerializer.cs
- ColumnProvider.cs
- ProfileService.cs
- Int32KeyFrameCollection.cs
- X509Certificate2Collection.cs
- LogicalExpressionTypeConverter.cs
- XamlTreeBuilder.cs
- TailPinnedEventArgs.cs
- AnimatedTypeHelpers.cs
- Operator.cs
- PingReply.cs
- COM2IVsPerPropertyBrowsingHandler.cs
- SystemIPGlobalProperties.cs
- AuthenticationServiceManager.cs
- XPathScanner.cs
- XhtmlBasicLabelAdapter.cs
- PartialList.cs
- SlipBehavior.cs
- ElementsClipboardData.cs
- PerspectiveCamera.cs
- ResourceProviderFactory.cs
- ToolStripItemClickedEventArgs.cs
- Missing.cs
- XmlSchemaAttributeGroup.cs
- AuthenticationModulesSection.cs
- ConfigurationStrings.cs
- XmlConvert.cs
- Rotation3D.cs
- BamlTreeUpdater.cs
- ItemChangedEventArgs.cs
- FileChangesMonitor.cs
- FormattedText.cs
- Int32.cs
- X509CertificateValidator.cs
- TabletDevice.cs
- SQLGuidStorage.cs
- SharedHttpTransportManager.cs
- ClientViaElement.cs
- Utility.cs
- SystemTcpStatistics.cs
- ImpersonationContext.cs
- Registry.cs
- DataGridCell.cs
- GeometryGroup.cs
- DiscoveryUtility.cs
- ToolStripRenderer.cs
- FigureParaClient.cs
- X500Name.cs
- TagNameToTypeMapper.cs
- DataGridTextBoxColumn.cs
- TemplateContentLoader.cs
- BrowserTree.cs
- DataPointer.cs
- MimeFormatter.cs
- AssemblyBuilder.cs
- InternalPermissions.cs
- EventListener.cs
- ExceptionValidationRule.cs
- AutomationPropertyInfo.cs
- CodePrimitiveExpression.cs
- ContractComponent.cs
- FixedSOMTable.cs
- StrokeDescriptor.cs
- RtfControlWordInfo.cs
- BamlLocalizerErrorNotifyEventArgs.cs
- NativeMethods.cs
- BinaryFormatterSinks.cs
- ToolStripCustomTypeDescriptor.cs
- SplitterPanelDesigner.cs
- TextEvent.cs
- OnOperation.cs
- TextViewSelectionProcessor.cs