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/ 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.
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