1、拖拽需要实现的事件包括：
PreviewMouseLeftButtonDown
LBoxSort_OnDrop
具体实现如下：
private void LBoxSort_OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e){var pos = e.GetPosition(LBoxSort);HitTestResult result = VisualTreeHelper.HitTest(LBoxSort, pos);if (result == null){return;}var listBoxItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);if (listBoxItem == null || listBoxItem.Content != LBoxSort.SelectedItem){return;}DataObject dataObj = new DataObject(listBoxItem.Content as Person);DragDrop.DoDragDrop(LBoxSort, dataObj, DragDropEffects.Move);}private void LBoxSort_OnDrop(object sender, DragEventArgs e){var pos = e.GetPosition(LBoxSort);var result = VisualTreeHelper.HitTest(LBoxSort, pos);if (result == null){return;}//查找元数据var sourcePerson = e.Data.GetData(typeof (Person)) as Person;if (sourcePerson == null){return;}//查找目标数据var listBoxItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit);if (listBoxItem == null){return;}var targetPerson = listBoxItem.Content as Person;if (ReferenceEquals(targetPerson, sourcePerson)){return;}_persons.Remove(sourcePerson);_persons.Insert(_persons.IndexOf(targetPerson), sourcePerson);}}
事件实现
2、排序功能实现：
数据源：
private ObservableCollection<Person> _persons = new ObservableCollection<Person>();private void InitData(){_persons.Add(new Person{Name = "test1", Order = "1"});_persons.Add(new Person { Name = "test2", Order = "2" });_persons.Add(new Person { Name = "test3", Order = "3" });_persons.Add(new Person { Name = "test4", Order = "4" });_persons.Add(new Person { Name = "test5", Order = "5" });}
数据源
3、排序功能实现：
为数据集合实现CollectionChanged事件，当数据集合发生变化时执行：
private void PersonsOnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e){if (e.Action == NotifyCollectionChangedAction.Remove){for (int i = e.OldStartingIndex; i < _persons.Count; i++){_persons[i].Order = i.ToString();}}else if (e.Action == NotifyCollectionChangedAction.Add){for (int i = e.NewStartingIndex; i < _persons.Count; i++){_persons[i].Order = i.ToString();}}}
排序
4、相关代码附加：
public class Person : INotifyPropertyChanged{public string Name { get; set; }private string _order;public string Order{get { return _order; }set { _order = value; OnPropertyChanged("Order"); }}public event PropertyChangedEventHandler PropertyChanged;[NotifyPropertyChangedInvocator]protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null){PropertyChangedEventHandler handler = PropertyChanged;if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));}}internal static class Utils{//根据子元素查找父元素public static T FindVisualParent<T>(DependencyObject obj) where T : class{while (obj != null){if (obj is T)return obj as T;obj = VisualTreeHelper.GetParent(obj);}return null;}}
相关代码
5、代码下载地址：
/detail/w_wanglei/6375371
