private void ExpendTree(TreeNode node)

        {

　　　　　　　　

            SwitchTree.UpdateLayout();

            for (int i = ; i < SwitchTree.Items.Count; i++)

            {

                TreeNode findNd = SwitchTree.Items[i] as TreeNode;

                TreeViewItem ti = SwitchTree.ItemContainerGenerator.ContainerFromIndex(i) as TreeViewItem;

                if (findNd == node && ti != null)

                {

                    ti.IsExpanded = true;

                    ti.IsSelected = true;

                    if (ti.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)

                    {

                        ti.UpdateLayout();

                    }

                    //展开

                    EependTreeByNode(ti);

                    break;

                }

                else

                {

                    if (ti != null)

                    {

                       TreeViewItem treeViewItem= RecurFindeNode(node, ti);

                        if (treeViewItem == null)

                        {

                            ti.IsExpanded = false;

                            continue;

                        }

                        //展开

                        EependTreeByNode(treeViewItem);

                        break;

                    }

                }

            }

            //EependTreeByNode(node);

        }

        private TreeViewItem RecurFindeNode(TreeNode n, TreeViewItem items)

        {

            TreeViewItem tv = null;

            if (n != null && items != null && items.HasItems)

            {

                items.IsExpanded = true;

                foreach (var item in items.Items)

                {

                    var node = item as TreeNode;

                    if (node == null || (node.nodes!=null&&!node.nodes.Any()))

                    {

                        continue;

                    }

                    if (items.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)

                    {

                        items.UpdateLayout();

                    }

                    TreeViewItem m_item = items.ItemContainerGenerator.ContainerFromItem(item) as TreeViewItem;

                    if (n == node && m_item != null)

                    {

                        //EependTreeByNode(m_item);

                        tv = m_item;

                    }

                    else

                    {

                        TreeViewItem treeNode = RecurFindeNode(n, m_item);

                        if (treeNode != null)

                        {

                            tv = treeNode;

                            break;

                        }

                        else

                        {

                            //items.IsExpanded = false;

                        }

                    }

                }

            }

            return tv;

        }

        private void EependTreeByNode(TreeViewItem contenier)

        {

            if (contenier != null)

            {

                //if (contenier.HasItems)

                //{

                    contenier.IsExpanded = true;

                    contenier.IsSelected = true;

                //}

                //else

                //{

                //    TreeViewItem parent = (TreeViewItem)contenier.Parent;

                //    if (parent != null)

                //    {

                //        parent.IsExpanded = true;

                //        parent.IsSelected = true;

                //    }

                //}

                if (contenier.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)

                {

                    contenier.UpdateLayout();

                }

            }

        }