ListView鼠标拖

private Point Position = new Point(0, 0);
private void treeFileView_ItemDrag(object sender, ItemDragEventArgs e)
{
DoDragDrop(e.Item, DragDropEffects.Move);
}

private void treeFileView_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(TreeNode)))
{
e.Effect = DragDropEffects.Move;
}
else
e.Effect = DragDropEffects.None;

}

string filePath = Application.StartupPath.ToString() + "\\MyFiles\\";
private void treeFileView_DragDrop(object sender, DragEventArgs e)
{
TreeNode myNode = null;
if (e.Data.GetDataPresent(typeof(TreeNode)))
{
myNode = (TreeNode)(e.Data.GetData(typeof(TreeNode)));
}
else
{
MessageBox.Show("error");
}

Position.X = e.X;
Position.Y = e.Y;
Position = treeFileView.PointToClient(Position);
TreeNode DropNode = treeFileView.GetNodeAt(Position);
if (DropNode.Parent == myNode || DropNode == myNode)
{

}
else if (DirAndFileOperator.IsFile(DropNode))
{

}
else
{
//DirAndFileOperator.MoveFolder(filePath + myNode.FullPath, filePath + DropNode.FullPath + @"\" + myNode.Name);
TreeNode DragNode = myNode;
myNode.Remove();
DropNode.Nodes.Add(DragNode);
}
treeFileView.SelectedNode = DropNode;
DropNode.Expand();
}

private void treeFileView_DragOver(object sender, DragEventArgs e)
{
TreeNode myNode = null;
if (e.Data.GetDataPresent(typeof(TreeNode)))
{
e.Effect = DragDropEffects.Move;
myNode = (TreeNode)(e.Data.GetData(typeof(TreeNode)));
}
else
e.Effect = DragDropEffects.None;
Position.X = e.X;
Position.Y = e.Y;
Position = treeFileView.PointToClient(Position);
TreeNode DropNode = treeFileView.GetNodeAt(Position);
treeFileView.SelectedNode = DropNode;
}