Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / 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 [....]/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
- DataSetMappper.cs
- AttributeProviderAttribute.cs
- FuncCompletionCallbackWrapper.cs
- DropSource.cs
- InheritanceContextHelper.cs
- TransactionContextValidator.cs
- BinaryVersion.cs
- Config.cs
- _NTAuthentication.cs
- SHA384Cng.cs
- __FastResourceComparer.cs
- Nodes.cs
- UIElementHelper.cs
- DataServiceQueryOfT.cs
- DrawingContextDrawingContextWalker.cs
- Content.cs
- Publisher.cs
- ConstraintManager.cs
- KnownTypeAttribute.cs
- HelpEvent.cs
- RotateTransform.cs
- Calendar.cs
- KnownBoxes.cs
- X509CertificateCollection.cs
- CompressStream.cs
- ArrayElementGridEntry.cs
- State.cs
- TypeToken.cs
- TraceSection.cs
- FixedFlowMap.cs
- InkCollectionBehavior.cs
- DataTableClearEvent.cs
- MsmqDiagnostics.cs
- LabelInfo.cs
- Condition.cs
- SqlResolver.cs
- TranslateTransform.cs
- TreeNodeCollection.cs
- DESCryptoServiceProvider.cs
- InfoCardSymmetricCrypto.cs
- ComEventsInfo.cs
- DataSetViewSchema.cs
- PerformanceCounter.cs
- AspCompat.cs
- SqlDuplicator.cs
- Matrix3DValueSerializer.cs
- FolderNameEditor.cs
- DbMetaDataCollectionNames.cs
- Margins.cs
- PartialArray.cs
- DataGridCommandEventArgs.cs
- ApplicationManager.cs
- Brush.cs
- FlowDocumentReaderAutomationPeer.cs
- RunWorkerCompletedEventArgs.cs
- StringDictionary.cs
- RenderTargetBitmap.cs
- URLEditor.cs
- TypedElement.cs
- BitmapEffectGroup.cs
- EndpointIdentity.cs
- GridView.cs
- Rule.cs
- MetadataHelper.cs
- DataGridTablesFactory.cs
- HelpProvider.cs
- SafeNativeMethods.cs
- EmbeddedMailObject.cs
- CharEntityEncoderFallback.cs
- AccessText.cs
- WindowsHyperlink.cs
- RadioButtonDesigner.cs
- processwaithandle.cs
- TracePayload.cs
- SocketStream.cs
- RegionData.cs
- FormViewDeleteEventArgs.cs
- _StreamFramer.cs
- RealizationDrawingContextWalker.cs
- DataSourceViewSchemaConverter.cs
- Main.cs
- LocalFileSettingsProvider.cs
- HtmlTableCellCollection.cs
- MultiView.cs
- StatusBarPanel.cs
- BehaviorEditorPart.cs
- Transform3D.cs
- WriteTimeStream.cs
- SpeechUI.cs
- FastPropertyAccessor.cs
- DetailsViewCommandEventArgs.cs
- ImmutableObjectAttribute.cs
- MethodExpr.cs
- OutputScopeManager.cs
- XmlTextAttribute.cs
- infer.cs
- NamespaceQuery.cs
- EntityUtil.cs
- MenuItemStyleCollection.cs
- ActivityScheduledRecord.cs