WPF DataGrid Drag

自己实现的功能、代码比较简单的DataGrid的Drag处理，着重处理DataGrid里的拖动排序。

 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;
 using System.Collections.ObjectModel;

 namespace CodeTest.DataGridDragDrop
 {
     public partial class Page_DataGridDragDrop : Page
     {
         ObservableCollection<Model_DataGrid> list1;
         ObservableCollection<Model_DataGrid> list2;
         Point TargetMousePoint;//Drag时Mouse的Point

         public Page_DataGridDragDrop()
         {
             InitializeComponent();
             InitializeDataGrid1();
             InitializeDataGrid2();
         }
         private void InitializeDataGrid1()
         {
             list1 = new ObservableCollection<Model_DataGrid>();
             list1.Add(new Model_DataGrid { Id = , Name = "N1" });
             list1.Add(new Model_DataGrid { Id = , Name = "N2" });
             list1.Add(new Model_DataGrid { Id = , Name = "N3" });
             list1.Add(new Model_DataGrid { Id = , Name = "N4" });
             list1.Add(new Model_DataGrid { Id = , Name = "N5" });
             list1.Add(new Model_DataGrid { Id = , Name = "N6" });
             list1.Add(new Model_DataGrid { Id = , Name = "N7" });
             list1.Add(new Model_DataGrid { Id = , Name = "N8" });
             list1.Add(new Model_DataGrid { Id = , Name = "N9" });
             this.DataGrid1.ItemsSource = list1;
         }
         private void InitializeDataGrid2()
         {
             list2 = new ObservableCollection<Model_DataGrid>();
             list2.Add(new Model_DataGrid { Id = , Name = "Na1" });
             list2.Add(new Model_DataGrid { Id = , Name = "Na2" });
             list2.Add(new Model_DataGrid { Id = , Name = "Na3" });
             list2.Add(new Model_DataGrid { Id = , Name = "Na4" });
             list2.Add(new Model_DataGrid { Id = , Name = "Na5" });
             list2.Add(new Model_DataGrid { Id = , Name = "Na6" });
             this.DataGrid2.ItemsSource = list2;
         }
         /// <summary>
         /// 拖动处理
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void DataGrid1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
         {
             Model_DataGrid DraggedItem = null;//源Row
             Model_DataGrid TargetItem = null;//目标Row
             //查找鼠标点击的源Row
             IInputElement element = DataGrid1.InputHitTest(e.GetPosition(DataGrid1));
             while(element != DataGrid1)
             {
                 if(element != null && element is DataGridRow)
                 {
                     DataGrid1.SelectedItem = ((DataGridRow)element).Item;
                     DraggedItem = (Model_DataGrid)DataGrid1.SelectedItem;
                     break;
                 }
                 else
                 {
                     DataGrid1.SelectedItem = null;
                     element = System.Windows.Media.VisualTreeHelper.GetParent(element as System.Windows.DependencyObject) as System.Windows.IInputElement;
                 }
             }

             if(this.DataGrid1.SelectedCells.Count > )
             {
                 Model_DataGrid DragData = this.DataGrid1.SelectedCells[].Item as Model_DataGrid;
                 DragDrop.DoDragDrop(DataGrid1, DragData, DragDropEffects.Move);
                 //拖动结束
                 element = DataGrid1.InputHitTest(TargetMousePoint);
                 while (element != DataGrid1)
                 {
                     if (element != null && element is DataGridRow)
                     {
                         TargetItem = (Model_DataGrid)((DataGridRow)element).Item;
                         break;
                     }
                     else
                     {
                         element = System.Windows.Media.VisualTreeHelper.GetParent(element as System.Windows.DependencyObject) as System.Windows.IInputElement;
                     }
                 }
                 //处理排序
                 if (TargetItem != null && !ReferenceEquals(DraggedItem, TargetItem))
                 {
                     //remove the source from the list
                     list1.Remove(DraggedItem);

                     //get target index
                     var targetIndex = list1.IndexOf(TargetItem);

                     //move source at the target's location
                     list1.Insert(targetIndex, DraggedItem);

                     //select the dropped item
                     DataGrid1.SelectedItem = DraggedItem;
                 }
             }
         }

         private void DataGrid2_Drop(object sender, DragEventArgs e)
         {
             IDataObject data = new DataObject();
             data = e.Data;
             Model_DataGrid obj = (Model_DataGrid)data.GetData(typeof(Model_DataGrid));
             Console.WriteLine(obj.Name);
         }
         /// <summary>
         /// 获取拖动结束时鼠标的Point
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void DataGrid1_DragOver(object sender, DragEventArgs e)
         {
             TargetMousePoint = e.GetPosition(DataGrid1);
         }
     }
 }