Csharp: TreeList Drag and Drop

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/// <summary>   /// https://www.codeproject.com/articles/3225/treelistview   /// https://www.codeproject.com/Tips/572728/TreeListViewEx-Tree-List-and-Drag-and-Drop       /// https://sourceforge.net/projects/objectlistview/   /// 涂聚文 20190704   /// Geovin Du   /// </summary>   public partial class TryTreeListView : Form   {       List<int> selectindex = new List<int>();//         TreeListViewItem draggedNode=new TreeListViewItem();       /// <summary>       ///       /// </summary>       public string draggtext       {           set;           get;       }       /// <summary>       ///       /// </summary>       string beforeEdit = "";       /// <summary>       ///       /// </summary>       string beforeEditName = "";       /// <summary>       ///       /// </summary>       string afterEdit = "";       string nodechildid = "";       string nodeparentid = "";       string nodechild = "";       string nodeparent = "";       string nodetitle = "";       /// <summary>       ///       /// </summary>       List<TreeListViewItem> getList = new List<TreeListViewItem>();       /// <summary>       ///       /// </summary>       /// <returns></returns>      DataTable setList()      {             DataTable dt = new DataTable();           dt.Columns.Add("Id", typeof(int));           dt.Columns.Add("Name", typeof(string));           dt.Columns.Add("ParentId", typeof(int));           dt.Columns.Add("Level", typeof(int));           dt.Rows.Add(1, "六福集团", 0,0);           dt.Rows.Add(2, "广州六福", 1,1);           dt.Rows.Add(3, "北京六福", 1,1);           dt.Rows.Add(4, "上海六福", 1,1);           dt.Rows.Add(5, "深圳六福", 1,1);           dt.Rows.Add(6, "人事部", 5,2);           dt.Rows.Add(7, "科技部", 5,2);           dt.Rows.Add(8, "恒大集团", 0, 0);           dt.Rows.Add(9, "恒大广州", 8, 1);           dt.Rows.Add(10, "恒大北京", 8, 1);           dt.Rows.Add(11, "恒大上海", 8, 1);           dt.Rows.Add(12, "恒大深圳", 8, 1);           dt.Rows.Add(13, "人事部", 11, 2);           dt.Rows.Add(14, "科技部", 11, 2);               return dt;      }      /// <summary>      ///      /// </summary>      /// <param name="tr1"></param>      /// <param name="parentId"></param>      private void setTreeView(TreeView tr1, int parentId)      {            DataRow[] ds = setList().Select("ParentId=" + parentId.ToString());          if (ds.Length > 0)          {              int pId = -1;              foreach (DataRow row in ds)              {                  TreeNode node = new TreeNode();                  node.Text = row["Name"].ToString();                  node.Tag = (int)row["Id"];                  pId = (int)row["ParentId"];                  if (pId == 0)                  {                      //添加根节点                      tr1.Nodes.Add(node);                  }                  else                  {                      //添加根节点之外的其他节点                      RefreshChildNode(tr1, node, pId);                  }                  //查找以node为父节点的子节点                  setTreeView(tr1, (int)node.Tag);                }          }                        }       /// <summary>       ///       /// </summary>       public void bind()      {            ColumnHeader head=new ColumnHeader();          head.Text = "Level";                 treeListView1.Columns.Add(head);          DataRow[] ds = setList().Select("ParentId=0");                                  foreach (DataRow row in ds)          {                //第一层              TreeListViewItem itemA = new TreeListViewItem(row["Name"].ToString(), 0);              itemA.Expand();              itemA.SubItems.Add(row["Id"].ToString());              itemA.SubItems.Add(row["ParentId"].ToString());              itemA.SubItems.Add(row["Level"].ToString());              itemA.ToolTipText = row["ParentId"].ToString();              treeListView1.Items.Add(itemA);              DataRow[] ds1 = setList().Select("ParentId=" + row["Id"].ToString());              if (ds1.Length > 0)              {                  //第二层                  foreach (DataRow row1 in ds1)                  {                      if (row["Id"].ToString() == row1["ParentId"].ToString())                      {                          TreeListViewItem item = new TreeListViewItem(row1["Name"].ToString(), 1);                          item.SubItems.Add(row1["Id"].ToString());                          item.SubItems.Add(row1["ParentId"].ToString());                          item.SubItems.Add(row1["Level"].ToString());                          item.ToolTipText = row1["ParentId"].ToString();                          itemA.Items.Add(item);                            DataRow[] ds2 = setList().Select("ParentId=" + row1["Id"].ToString());                          if (ds2.Length > 0)                          {                              foreach (DataRow row2 in ds2)                              {                                  //第三层                                  if (row1["Id"].ToString() == row2["ParentId"].ToString())                                  {                                      TreeListViewItem item2 = new TreeListViewItem(row2["Name"].ToString(), 2);                                      item2.SubItems.Add(row2["Id"].ToString());                                      item2.SubItems.Add(row2["ParentId"].ToString());                                      item2.SubItems.Add(row2["Level"].ToString());                                      item2.ToolTipText = row2["ParentId"].ToString();                                      item.Items.Add(item2);                                  }                                  }                          }                      }                     }              }                }        }      /// <summary>      /// 处理根节点的子节点      /// </summary>      /// <param name="tr1"></param>      /// <param name="treeNode"></param>      /// <param name="parentId"></param>      private void RefreshChildNode(TreeView tr1, TreeNode treeNode, int parentId)      {          foreach (TreeNode node in tr1.Nodes)          {              if ((int)node.Tag == parentId)              {                  node.Nodes.Add(treeNode);                  return;              }              else if (node.Nodes.Count > 0)              {                  FindChildNode(node, treeNode, parentId);              }          }      }      /// <summary>      /// 处理根节点的子节点的子节点      /// </summary>      /// <param name="tNode"></param>      /// <param name="treeNode"></param>      /// <param name="parentId"></param>      private void FindChildNode(TreeNode tNode, TreeNode treeNode, int parentId)      {            foreach (TreeNode node in tNode.Nodes)          {              if ((int)node.Tag == parentId)              {                  node.Nodes.Add(treeNode);                  return;              }              else if (node.Nodes.Count > 0)              {                  FindChildNode(node, treeNode, parentId);                }            }        }           /// <summary>       ///       /// </summary>       public TryTreeListView()       {           InitializeComponent();       }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void TryTreeListView_Load(object sender, EventArgs e)       {           setTreeView(this.treeView1, 0);           this.treeView1.ExpandAll();           bind();       }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_ItemCheck(object sender, ItemCheckEventArgs e)       {             TreeListViewItem item = new TreeListViewItem();           //MessageBox.Show(e.Index.ToString());           // TreeListViewItem           //MessageBox.Show(treeListView1.SelectedItems.Count.ToString());           // MessageBox.Show(treeListView1.Items[0].SubItems[0].Text);           //MessageBox.Show(treeListView1.GetTreeListViewItemFromIndex(e.Index).Text);           if (treeListView1.GetTreeListViewItemFromIndex(e.Index).Checked == false)           {                 //MessageBox.Show(treeListView1.GetTreeListViewItemFromIndex(e.Index).SubItems[0].Text);  //从子节点开始               item = treeListView1.GetTreeListViewItemFromIndex(e.Index);               getList.Add(item);           }             //取消           //if (treeListView1.GetTreeListViewItemFromIndex(e.Index).Checked == true)           //{           //    MessageBox.Show(treeListView1.GetTreeListViewItemFromIndex(e.Index).SubItems[0].Text);           //}             //MessageBox.Show(e.Index.ToString());       }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_ItemActivate(object sender, EventArgs e)       {                   }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void button1_Click(object sender, EventArgs e)       {           this.textBox1.Text=getList.Count.ToString();           string s = getList[0].FullPath; //节点路径           string l=getList[0].Level.ToString();           string ss = getList[0].Parent.Text;           string sb = getList[0].Parent.SubItems[0].Text;           Form1 frm = new Form1();           frm.fullpath = getList[0].FullPath; //节点路径           frm.editname = getList[0].Text;           frm.id = getList[0].SubItems[1].Text;           if (frm.ShowDialog() == DialogResult.OK)           {             }            getList = new List<TreeListViewItem>();                                 }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_ItemMouseHover(object sender, ListViewItemMouseHoverEventArgs e)       {           //MessageBox.Show(e.Item.Text);       }       /// <summary>       /// 编辑前的值       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_BeforeLabelEdit(object sender, TreeListViewBeforeLabelEditEventArgs e)       {           MessageBox.Show(e.Item.Text);       }         /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_AfterLabelEdit(object sender, TreeListViewLabelEditEventArgs e)       {           MessageBox.Show(e.Item.Text);       }       /// <summary>       /// 拖放完成发生       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_DragDrop(object sender, DragEventArgs e)       {           try           {                 // Retrieve the client coordinates of the drop location.               Point targetPoint = treeListView1.PointToClient(new Point(e.X, e.Y));               //所要放置的位置               // Retrieve the node at the drop location.               TreeListViewItem targetNode = treeListView1.GetItemAt(targetPoint);               TreeListViewItem fullNode = treeListView1.GetItemAtFullRow(targetPoint);               // draggedNode = (TreeListViewItem)e.Data.GetData(typeof(TreeListViewItem));               //string s = e.Data.GetData(typeof(TreeListViewItem)).ToString();               System.Windows.Forms.TreeListView.DragItemData data = (System.Windows.Forms.TreeListView.DragItemData)e.Data.GetData(typeof(System.Windows.Forms.TreeListView.DragItemData));               draggedNode = (TreeListViewItem)data.DragItems[0];                 if (!draggedNode.Equals(targetNode) && !ContainsNode(draggedNode, targetNode))               {                   // If it is a move operation, remove the node from its current                   // location and add it to the node at the drop location.                   if (e.Effect == DragDropEffects.Move)                   {                           //draggedNode.Remove();                       // int indx=targetNode.Index;                       // targetNode.Items.Insert(draggedNode.Index,draggedNode);                       //treeListView1.Items.Insert(indx, targetNode);                         draggedNode.Remove();                       targetNode.Items.Add(draggedNode);                         // targetNode.Items.Insert(indx, draggedNode); //父节点，添加移动的子节点                         nodechildid = draggedNode.SubItems[1].Text;//子节点                       nodeparentid = targetNode.SubItems[1].Text;//父节点                       nodechild = draggedNode.Text;//子节点                       nodeparent = targetNode.Text;//父节点                       nodetitle = draggedNode.ToolTipText;                         //bookKindListInfo.BookKindID = int.Parse(nodechildid);                       //bookKindListInfo.BookKindParent = int.Parse(nodeparentid);                       //bookKindListInfo.BookKindName = nodechild;                       //bookKindListInfo.BookKindCode = nodetitle;                       //this.textBox1.Text = nodeparent;                       //this.textBox2.Text = nodechild;                       //this.textBox3.Text = nodetitle;                       //formOperatingStringInfo.NodeMoveUpdated = true;                         //button1.Text = "移動區域節點";                         //administrativeAreaListInfo.AreaID = int.Parse(nodechildid);                                        //administrativeAreaListInfo.AreaParentID = int.Parse(nodeparentid);                       //administrativeAreaListInfo.AreaName = nodechild;                       //int k = bookKindListBLL.UpdateBookKindList(bookKindListInfo);                       //if (k >= 1)                       //{                       //    MessageBox.Show("移動书目录成功！");                       //    InitDataTable();                       //    BindRoot();                       //    treeView1.ExpandAll(); //全部展开                       //}                       //else                       //{                       //    MessageBox.Show("移動书目录不成功！");                       //}                           /// MessageBox.Show("子节点：" + nodechild + ",父节点：" + nodeparent, "拖动节点", MessageBoxButtons.OK, MessageBoxIcon.Information);                   }                     // If it is a copy operation, clone the dragged node                   // and add it to the node at the drop location.                   else if (e.Effect == DragDropEffects.Copy)                   {                       targetNode.Items.Add((TreeListViewItem)draggedNode.Clone());                   }                     // Expand the node at the location                   // to show the dropped node.                   targetNode.Expand();               }           }           catch (Exception ex)           {               ex.Message.ToString();           }       }         /// <summary>       ///Determine whether one node is a parent       ///or ancestor of a second node.       /// </summary>       /// <param name="node1"></param>       /// <param name="node2"></param>       /// <returns></returns>       private bool ContainsNode(TreeListViewItem node1, TreeListViewItem node2)       {           // Check the parent node of the second node.           if (node2.Parent == null) return false;           if (node2.Parent.Equals(node1)) return true;             // If the parent node is not null or equal to the first node,           // call the ContainsNode method recursively using the parent of           // the second node.           return ContainsNode(node1, node2.Parent);       }         /// <summary>       /// 施放离开边界时发生       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_DragLeave(object sender, EventArgs e)       {                   }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_DragEnter(object sender, DragEventArgs e)       {           e.Effect = e.AllowedEffect;                               }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_ItemDrag(object sender, ItemDragEventArgs e)       {           // Move the dragged node when the left mouse button is used.           if (e.Button == MouseButtons.Left)           {               DoDragDrop(e.Item, DragDropEffects.Move);               draggedNode = (TreeListViewItem)e.Item;             }             // Copy the dragged node when the right mouse button is used.           else if (e.Button == MouseButtons.Right)           {               DoDragDrop(e.Item, DragDropEffects.Copy);               draggedNode = (TreeListViewItem)e.Item;           }       }         /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_DragOver(object sender, DragEventArgs e)       {           //draggedNode = (TreeListViewItem)e.Data.GetData(typeof(TreeListViewItem));                 //Point draggedPoint = treeListView1.PointToClient(new Point(e.X, e.Y));               //draggedNode = treeListView1.GetItemAt(draggedPoint);                   }       /// <summary>       /// 双控件       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_DoubleClick(object sender, EventArgs e)       {          string selectedname=treeListView1.SelectedItems[0].Text;          Form1 frm = new Form1();          frm.fullpath = treeListView1.SelectedItems[0].FullPath; //节点路径          frm.editname = treeListView1.SelectedItems[0].Text;          frm.id = treeListView1.SelectedItems[0].SubItems[1].Text;          if (frm.ShowDialog() == DialogResult.OK)          {            }          this.textBox1.Text = selectedname;       }       /// <summary>       ///       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void treeListView1_Leave(object sender, EventArgs e)       {           if (treeListView1.SelectedItems!= null)           {               //让选中项背景色呈现红色               treeListView1.SelectedItems[0].BackColor = Color.Red;               //前景色为白色               treeListView1.SelectedItems[0].ForeColor = Color.White;           }       }       /// <summary>       /// 添加子节点       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void addToolStripMenuItem_Click(object sender, EventArgs e)       {         }       /// <summary>       /// 编辑当前节点       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void editToolStripMenuItem_Click(object sender, EventArgs e)       {         }       /// <summary>       /// 删除当前节点       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void delToolStripMenuItem_Click(object sender, EventArgs e)       {         }       /// <summary>       /// 添加同层节点       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       private void addLevelToolStripMenuItem_Click(object sender, EventArgs e)       {         }       }