Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SortableBindingList.cs / 1305376 / SortableBindingList.cs
using System; using System.Linq; using System.Collections.Generic; using System.Text; using System.ComponentModel; using System.Linq.Expressions; using System.Collections; using System.Reflection; using System.Xml.Linq; namespace System.Data.Linq { ////// Adds sorting feature to BindingList ////// internal class SortableBindingList : BindingList { internal SortableBindingList(IList list) : base(list) { } private bool isSorted = false; private PropertyDescriptor sortProperty = null; private ListSortDirection sortDirection = ListSortDirection.Ascending; protected override void RemoveSortCore() { isSorted = false; sortProperty = null; } protected override ListSortDirection SortDirectionCore { get { return sortDirection; } } protected override PropertyDescriptor SortPropertyCore { get { return sortProperty; } } protected override bool IsSortedCore { get { return isSorted; } } protected override bool SupportsSortingCore { get { return true; } } protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction) { //Only apply sort if the column is sortable, decision was made not to throw in this case. //Don't prevent nullable types from working. Type propertyType = prop.PropertyType; if (PropertyComparer.IsAllowable(propertyType)) { ((List )this.Items).Sort(new PropertyComparer(prop, direction)); sortDirection = direction; sortProperty = prop; isSorted = true; OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1)); } } internal class PropertyComparer : Comparer { private PropertyDescriptor prop; private IComparer comparer; private ListSortDirection direction; private bool useToString; internal PropertyComparer(PropertyDescriptor prop, ListSortDirection direction) { if (prop.ComponentType != typeof(T)) { throw new MissingMemberException(typeof(T).Name, prop.Name); } this.prop = prop; this.direction = direction; if (OkWithIComparable(prop.PropertyType)) { Type comparerType = typeof(Comparer<>).MakeGenericType(prop.PropertyType); PropertyInfo defaultComparer = comparerType.GetProperty("Default"); comparer = (IComparer)defaultComparer.GetValue(null, null); useToString = false; } else if (OkWithToString(prop.PropertyType)) { comparer = StringComparer.CurrentCultureIgnoreCase; useToString = true; } } public override int Compare(T x, T y) { object xValue = prop.GetValue(x); object yValue = prop.GetValue(y); if (useToString) { xValue = xValue != null ? xValue.ToString() : null; yValue = yValue != null ? yValue.ToString() : null; } if (direction == ListSortDirection.Ascending) { return comparer.Compare(xValue, yValue); } else { return comparer.Compare(yValue, xValue); } } protected static bool OkWithToString(Type t) { // this is the list of types that behave specially for the purpose of // sorting. if we have a property of this type, and it does not implement // IComparable, then this class will sort the properties according to the // ToString() method. // In the case of an XNode, the ToString() returns the // XML, which is what we care about. return (t.Equals(typeof(XNode)) || t.IsSubclassOf(typeof(XNode))); } protected static bool OkWithIComparable(Type t) { return (t.GetInterface("IComparable") != null) || (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)); } public static bool IsAllowable(Type t) { return OkWithToString(t) || OkWithIComparable(t); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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