wpf ListBox拖动排序实现

XAML:

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication6
{
    /// 

    /// MainWindow.xaml 的交互逻辑
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void LBoxSort_OnPreviewMouseMove(object sender, MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                var pos = e.GetPosition(LBoxSort);
                HitTestResult result = VisualTreeHelper.HitTest(LBoxSort, pos);
                if (result == null)
                {
                    return;
                }
                var listBoxItem = Utils.FindVisualParent(result.VisualHit);
                if (listBoxItem == null || listBoxItem.Content != LBoxSort.SelectedItem)
                {
                    return;
                }
                DataObject dataObj = new DataObject(listBoxItem.Content as TextBlock);
                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(TextBlock)) as TextBlock;
            if (sourcePerson == null)
            {
                return;
            }
            //查找目标数据
            var listBoxItem = Utils.FindVisualParent(result.VisualHit);
            if (listBoxItem == null)
            {
                return;
            }
            var targetPerson = listBoxItem.Content as TextBlock;
            if (ReferenceEquals(targetPerson, sourcePerson))
            {
                return;
            }
            LBoxSort.Items.Remove(sourcePerson);
            LBoxSort.Items.Insert(LBoxSort.Items.IndexOf(targetPerson), sourcePerson);
        }
    }
    internal static class Utils
    {
        //根据子元素查找父元素
        public static T FindVisualParent(DependencyObject obj) where T : class
        {
            while (obj != null)
            {
                if (obj is T)
                    return obj as T;

                obj = VisualTreeHelper.GetParent(obj);
            }
            return null;
        }
    }
}