Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / FieldNameLookup.cs / 1305376 / FieldNameLookup.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data { 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; 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(); } 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; } 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. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data { 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; 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(); } 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; } 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
- AxHost.cs
- DebuggerAttributes.cs
- QilReference.cs
- StylusPointDescription.cs
- IUnknownConstantAttribute.cs
- ResourceKey.cs
- TaskExtensions.cs
- CodeExpressionStatement.cs
- ObjectViewFactory.cs
- RangeValidator.cs
- ViewBase.cs
- WmfPlaceableFileHeader.cs
- WindowsBrush.cs
- FontNamesConverter.cs
- ZipIOBlockManager.cs
- UriWriter.cs
- TransformDescriptor.cs
- SourceCollection.cs
- MouseCaptureWithinProperty.cs
- SpeakInfo.cs
- XmlSchemaCompilationSettings.cs
- _SslSessionsCache.cs
- AppDomainResourcePerfCounters.cs
- SspiHelper.cs
- OAVariantLib.cs
- SchemaUtility.cs
- MetadataArtifactLoaderResource.cs
- ConnectionPointGlyph.cs
- PathSegment.cs
- SiteMapNodeItem.cs
- ErrorWebPart.cs
- DataSourceXmlSerializer.cs
- QilDataSource.cs
- CacheHelper.cs
- TagPrefixInfo.cs
- Mouse.cs
- MetaModel.cs
- Geometry3D.cs
- OleDbErrorCollection.cs
- ProjectionPruner.cs
- SkinBuilder.cs
- Stacktrace.cs
- GifBitmapEncoder.cs
- ObjectDataSourceSelectingEventArgs.cs
- HttpHandlersSection.cs
- EdmSchemaAttribute.cs
- NetworkInterface.cs
- ResourceDescriptionAttribute.cs
- IdleTimeoutMonitor.cs
- GuidTagList.cs
- XsdBuildProvider.cs
- WebBrowserSiteBase.cs
- DataSpaceManager.cs
- TouchesCapturedWithinProperty.cs
- Adorner.cs
- CustomUserNameSecurityTokenAuthenticator.cs
- MethodBuilder.cs
- SafeFileHandle.cs
- MimeTextImporter.cs
- MulticastNotSupportedException.cs
- VirtualizedContainerService.cs
- Faults.cs
- PointLightBase.cs
- ThousandthOfEmRealDoubles.cs
- ResourcePermissionBase.cs
- SQLDecimalStorage.cs
- SqlTriggerAttribute.cs
- BaseParser.cs
- Behavior.cs
- ExceptionHelpers.cs
- SignatureToken.cs
- TCPClient.cs
- FixedPosition.cs
- RectAnimation.cs
- ColumnClickEvent.cs
- CompositeActivityTypeDescriptorProvider.cs
- SharedConnectionWorkflowTransactionService.cs
- HideDisabledControlAdapter.cs
- DataReaderContainer.cs
- NativeMethods.cs
- DataService.cs
- CodeAccessSecurityEngine.cs
- SerializationException.cs
- XmlAnyElementAttributes.cs
- Focus.cs
- COM2Properties.cs
- XmlILCommand.cs
- Sentence.cs
- XamlClipboardData.cs
- PageBuildProvider.cs
- DrawListViewItemEventArgs.cs
- SymLanguageType.cs
- ToolStripCustomTypeDescriptor.cs
- Number.cs
- PointLight.cs
- XmlDataSourceDesigner.cs
- BitmapCodecInfo.cs
- BinHexEncoding.cs
- XmlMtomWriter.cs
- TemplateAction.cs