Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / MS / Internal / Data / SortFieldComparer.cs / 1 / SortFieldComparer.cs
//---------------------------------------------------------------------------- // //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // // Description: IComparer class to sort by class property value (using reflection). // // See spec at http://avalon/connecteddata/M5%20Specs/IDataCollection.mht // // History: // 06/02/2003 : [....] - Created // //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Collections; using System.Collections.Generic; using System.Reflection; using System.Globalization; using MS.Utility; using System.Windows; namespace MS.Internal.Data { ////// IComparer class to sort by class property value (using reflection). /// internal class SortFieldComparer : IComparer { ////// Create a comparer, using the SortDescription and a Type; /// tries to find a reflection PropertyInfo for each property name /// /// list of property names and direction to sort by /// culture to use for comparisons internal SortFieldComparer(SortDescriptionCollection sortFields, CultureInfo culture) { _sortFields = sortFields; _fields = CreatePropertyInfo(_sortFields); // create the comparer _comparer = (culture == null || culture == CultureInfo.InvariantCulture) ? Comparer.DefaultInvariant : (culture == CultureInfo.CurrentCulture) ? Comparer.Default : new Comparer(culture); } ////// Compares two objects and returns a value indicating whether one is less than, equal to or greater than the other. /// /// first item to compare /// second item to compare ///; <0: o1 < o2; =0: o1 == o2; > 0: o1 > o2 ////// Compares the 2 items using the list of property names and directions. /// public int Compare(object o1, object o2) { int result = 0; // compare both objects by each of the properties until property values don't match for (int k = 0; k < _fields.Length; ++k) { object v1 = _fields[k].GetValue(o1); object v2 = _fields[k].GetValue(o2); result = _comparer.Compare(v1, v2); if (_fields[k].descending) result = -result; if (result != 0) break; } return result; } // Private Methods private SortPropertyInfo[] CreatePropertyInfo(SortDescriptionCollection sortFields) { SortPropertyInfo[] fields = new SortPropertyInfo[sortFields.Count]; for (int k = 0; k < sortFields.Count; ++k) { PropertyPath pp; if (String.IsNullOrEmpty(sortFields[k].PropertyName)) { // sort by the object itself (as opposed to a property) pp = null; } else { // sort by the value of a property path, to be applied to // the items in the list pp = new PropertyPath(sortFields[k].PropertyName); } // remember PropertyPath and direction, used when actually sorting fields[k].info = pp; fields[k].descending = (sortFields[k].Direction == ListSortDirection.Descending); } return fields; } // Private Fields struct SortPropertyInfo { internal PropertyPath info; internal bool descending; internal object GetValue(object o) { object value; if (info == null) { value = o; } else { using (info.SetContext(o)) { value = info.GetValue(); } } return value; } } SortPropertyInfo[] _fields; SortDescriptionCollection _sortFields; Comparer _comparer; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // // Description: IComparer class to sort by class property value (using reflection). // // See spec at http://avalon/connecteddata/M5%20Specs/IDataCollection.mht // // History: // 06/02/2003 : [....] - Created // //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Collections; using System.Collections.Generic; using System.Reflection; using System.Globalization; using MS.Utility; using System.Windows; namespace MS.Internal.Data { ////// IComparer class to sort by class property value (using reflection). /// internal class SortFieldComparer : IComparer { ////// Create a comparer, using the SortDescription and a Type; /// tries to find a reflection PropertyInfo for each property name /// /// list of property names and direction to sort by /// culture to use for comparisons internal SortFieldComparer(SortDescriptionCollection sortFields, CultureInfo culture) { _sortFields = sortFields; _fields = CreatePropertyInfo(_sortFields); // create the comparer _comparer = (culture == null || culture == CultureInfo.InvariantCulture) ? Comparer.DefaultInvariant : (culture == CultureInfo.CurrentCulture) ? Comparer.Default : new Comparer(culture); } ////// Compares two objects and returns a value indicating whether one is less than, equal to or greater than the other. /// /// first item to compare /// second item to compare ///; <0: o1 < o2; =0: o1 == o2; > 0: o1 > o2 ////// Compares the 2 items using the list of property names and directions. /// public int Compare(object o1, object o2) { int result = 0; // compare both objects by each of the properties until property values don't match for (int k = 0; k < _fields.Length; ++k) { object v1 = _fields[k].GetValue(o1); object v2 = _fields[k].GetValue(o2); result = _comparer.Compare(v1, v2); if (_fields[k].descending) result = -result; if (result != 0) break; } return result; } // Private Methods private SortPropertyInfo[] CreatePropertyInfo(SortDescriptionCollection sortFields) { SortPropertyInfo[] fields = new SortPropertyInfo[sortFields.Count]; for (int k = 0; k < sortFields.Count; ++k) { PropertyPath pp; if (String.IsNullOrEmpty(sortFields[k].PropertyName)) { // sort by the object itself (as opposed to a property) pp = null; } else { // sort by the value of a property path, to be applied to // the items in the list pp = new PropertyPath(sortFields[k].PropertyName); } // remember PropertyPath and direction, used when actually sorting fields[k].info = pp; fields[k].descending = (sortFields[k].Direction == ListSortDirection.Descending); } return fields; } // Private Fields struct SortPropertyInfo { internal PropertyPath info; internal bool descending; internal object GetValue(object o) { object value; if (info == null) { value = o; } else { using (info.SetContext(o)) { value = info.GetValue(); } } return value; } } SortPropertyInfo[] _fields; SortDescriptionCollection _sortFields; Comparer _comparer; } } // 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
- DefaultValidator.cs
- Vector3DConverter.cs
- StorageRoot.cs
- Int64Converter.cs
- FunctionDescription.cs
- FontStyles.cs
- InvariantComparer.cs
- MembershipSection.cs
- ComponentDispatcherThread.cs
- PropVariant.cs
- ExpressionBindingCollection.cs
- GroupBoxAutomationPeer.cs
- CngAlgorithmGroup.cs
- CultureMapper.cs
- DrawToolTipEventArgs.cs
- RightsManagementErrorHandler.cs
- XmlUtil.cs
- ClientSettingsStore.cs
- LockCookie.cs
- EditCommandColumn.cs
- Polyline.cs
- UIElementHelper.cs
- ValidationSummary.cs
- EntityKeyElement.cs
- WebSysDisplayNameAttribute.cs
- Int32Converter.cs
- Directory.cs
- Shared.cs
- NamespaceInfo.cs
- WizardForm.cs
- PersonalizationEntry.cs
- ConditionValidator.cs
- PrePrepareMethodAttribute.cs
- OracleDateTime.cs
- EventWaitHandleSecurity.cs
- LocatorBase.cs
- HtmlInputReset.cs
- AsymmetricKeyExchangeDeformatter.cs
- StreamInfo.cs
- DataSetUtil.cs
- SmtpMail.cs
- GestureRecognitionResult.cs
- GPStream.cs
- Sentence.cs
- HeaderedItemsControl.cs
- ImplicitInputBrush.cs
- Zone.cs
- Tuple.cs
- ApplicationDirectory.cs
- ClientBuildManager.cs
- CallbackDebugElement.cs
- DesignerDataSchemaClass.cs
- PixelFormats.cs
- SpellerHighlightLayer.cs
- DataGridViewColumnHeaderCell.cs
- DocumentReferenceCollection.cs
- Int32AnimationUsingKeyFrames.cs
- CodeTypeOfExpression.cs
- GlobalizationAssembly.cs
- SchemeSettingElement.cs
- _UncName.cs
- OperationParameterInfoCollection.cs
- DataObjectAttribute.cs
- ProvidersHelper.cs
- ConnectionsZoneAutoFormat.cs
- DataGridDesigner.cs
- PrintPreviewControl.cs
- SizeChangedEventArgs.cs
- MsmqIntegrationProcessProtocolHandler.cs
- HebrewNumber.cs
- unsafeIndexingFilterStream.cs
- SendMailErrorEventArgs.cs
- SlotInfo.cs
- Item.cs
- TextEffect.cs
- Cursors.cs
- SQLDecimalStorage.cs
- TableCell.cs
- ObjectAnimationBase.cs
- ImageAutomationPeer.cs
- SystemShuttingDownException.cs
- GatewayIPAddressInformationCollection.cs
- SelectionGlyph.cs
- WindowsListViewSubItem.cs
- UnitySerializationHolder.cs
- EnumValAlphaComparer.cs
- ResourceReader.cs
- OutputCacheSettings.cs
- FormDocumentDesigner.cs
- MethodBuilder.cs
- CoTaskMemUnicodeSafeHandle.cs
- AsymmetricKeyExchangeFormatter.cs
- AlignmentYValidation.cs
- ComponentCache.cs
- StorageMappingItemCollection.cs
- SQLInt32Storage.cs
- ConfigDefinitionUpdates.cs
- VisualBasic.cs
- HebrewCalendar.cs
- Variable.cs