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
- FileDialogPermission.cs
- X509ImageLogo.cs
- VideoDrawing.cs
- WebExceptionStatus.cs
- LiteralControl.cs
- StsCommunicationException.cs
- ExtendedTransformFactory.cs
- TextParaLineResult.cs
- XPathMessageFilter.cs
- FileLoadException.cs
- XsltCompileContext.cs
- StateWorkerRequest.cs
- EUCJPEncoding.cs
- ProfileSettingsCollection.cs
- SoapHeader.cs
- SourceFileInfo.cs
- EntityDataSourceChangingEventArgs.cs
- RefExpr.cs
- CacheChildrenQuery.cs
- MetabaseServerConfig.cs
- Array.cs
- ZipIOBlockManager.cs
- SocketPermission.cs
- Types.cs
- DbDataRecord.cs
- ByteAnimation.cs
- ToolStripSeparator.cs
- NativeCompoundFileAPIs.cs
- __FastResourceComparer.cs
- ValidatorUtils.cs
- ClientConfigurationSystem.cs
- input.cs
- HuffModule.cs
- EntityDataSourceDesigner.cs
- RuntimeWrappedException.cs
- SqlInternalConnection.cs
- DSASignatureDeformatter.cs
- TableProviderWrapper.cs
- HyperLinkColumn.cs
- CapabilitiesSection.cs
- GridPattern.cs
- Internal.cs
- XmlNotation.cs
- XmlSchemaObject.cs
- XmlSchema.cs
- KeyGestureConverter.cs
- ConstrainedDataObject.cs
- XmlSchemaSimpleContentExtension.cs
- _NestedSingleAsyncResult.cs
- TypeFieldSchema.cs
- HandlerFactoryCache.cs
- OpacityConverter.cs
- StylusSystemGestureEventArgs.cs
- ProviderException.cs
- GCHandleCookieTable.cs
- LinkClickEvent.cs
- XmlUTF8TextWriter.cs
- MobileControlBuilder.cs
- XXXInfos.cs
- NamespaceInfo.cs
- IConvertible.cs
- Cell.cs
- PaintEvent.cs
- QilTypeChecker.cs
- EmptyQuery.cs
- CrossAppDomainChannel.cs
- ToolboxComponentsCreatedEventArgs.cs
- XmlCodeExporter.cs
- WebPartDescriptionCollection.cs
- StorageRoot.cs
- DataRelation.cs
- FontWeights.cs
- HashCoreRequest.cs
- ConnectionsZone.cs
- PublisherIdentityPermission.cs
- WebPartEventArgs.cs
- ChannelManager.cs
- SourceFileBuildProvider.cs
- EntityDataSourceValidationException.cs
- COM2ComponentEditor.cs
- DrawListViewItemEventArgs.cs
- ToolboxItemAttribute.cs
- XmlnsCache.cs
- WebPartVerb.cs
- Collection.cs
- EncoderBestFitFallback.cs
- FlowDocumentReaderAutomationPeer.cs
- CompletionCallbackWrapper.cs
- NotifyParentPropertyAttribute.cs
- updatecommandorderer.cs
- XslTransform.cs
- FactoryId.cs
- EventNotify.cs
- DataGridViewSortCompareEventArgs.cs
- ValidationSummary.cs
- SemanticResolver.cs
- ToolStripDropDownClosedEventArgs.cs
- PeerApplication.cs
- DurableEnlistmentState.cs
- MouseOverProperty.cs