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@H_674_7@public class Country { public String Name { get; set; } public int SortOrder { get; set; } }
我的xaml：
@H_674_7@<TreeView Name="CountryTreeView" Itemssource="{Binding}"> <TreeView.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding Path=NamE}"/> </DataTemplate> </TreeView.ItemTemplate> </TreeView>
代码隐藏：
@H_674_7@readonly ObservableCollection<Country> Countries; public MainWindow() { InitializeComponent(); Countries = new ObservableCollection<Country> { new Country{name = "Denmark",SortOrder = 0},new Country{name = "Norway",SortOrder = 1},new Country{name = "Sweden",SortOrder = 2},new Country{name = "Iceland",SortOrder = 3},new Country{name = "Greenland",SortOrder = 4},}; CountryTreeView.DataContext = Countries; }
我想让Treeview根据SortOrder值对Country进行排序.
它需要能够即时执行此操作.
因此,如果我为Name =“Denmark”更改SortOrder = 10,TreeView将自动反映这一点.
@H_674_7@public class SortabLeobservableCollection<T> : ObservableCollection<T> { // Constructors public SortabLeobservableCollection() : base(){} public SortabLeobservableCollection(List<T> l) : base(l){} public SortabLeobservableCollection(IEnumerable<T> l) :base (l) {} #region SorTing /// <sumMary> /// Sorts the items of the collection in ascending order according to a key. /// </sumMary> /// <typeparam name="TKey">The type of the key returned by <paramref name="keySELEctor"/>.</typeparam> /// <param name="keySELEctor">A function to extract a key from an item.</param> public void Sort<TKey>(Func<T,TKey> keySELEctor) { InternalSort(Items.OrderBy(keySELEctor)); } /// <sumMary> /// Sorts the items of the collection in descending order according to a key. /// </sumMary> /// <typeparam name="TKey">The type of the key returned by <paramref name="keySELEctor"/>.</typeparam> /// <param name="keySELEctor">A function to extract a key from an item.</param> public void SortDescending<TKey>(Func<T,TKey> keySELEctor) { InternalSort(Items.OrderByDescending(keySELEctor)); } /// <sumMary> /// Sorts the items of the collection in ascending order according to a key. /// </sumMary> /// <typeparam name="TKey">The type of the key returned by <paramref name="keySELEctor"/>.</typeparam> /// <param name="keySELEctor">A function to extract a key from an item.</param> /// <param name="comparer">An <see cref="IComparer{T}"/> to compare keys.</param> public void Sort<TKey>(Func<T,TKey> keySELEctor,IComparer<TKey> comparer) { InternalSort(Items.OrderBy(keySELEctor,comparer)); } /// <sumMary> /// Moves the items of the collection so that their orders are the same as those of the items provided. /// </sumMary> /// <param name="sortedItems">An <see cref="IEnumerable{T}"/> to provide item orders.</param> private void InternalSort(IEnumerable<T> sortedItems) { var sortedItemsList = sortedItems.ToList(); foreach (var item in sortedItemsList) { Move(IndexOf(item),sortedItemsList.IndexOf(item)); } } #endregion // SorTing }
然后你会通过调用类似的东西对它进行排序
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