TreeView 树节点的处理

TreeView 树节点的处理

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using WinForm_CRUD.BLL;
 using WinForm_CRUD.Model;

 namespace WinForm_TestTree
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         MyORM_BLL myORM_BLL = new MyORM_BLL();

         /// <summary>
         /// import Area
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnImportArea_Click(object sender, EventArgs e)
         {

         }

         /// <summary>
         /// 窗口加载时 省市联动
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void Form1_Load(object sender, EventArgs e)
         {
             LoadAlllNodes();
         }

         /// <summary>
         /// 加载所有节点
         /// </summary>
         private void LoadAlllNodes()
         {
             treeView1.Nodes.Clear();
             //根据PID=0查询省
             List<Object> list = myORM_BLL.SelectModelByField(typeof(T_AREA), "PID=0");
             //for 遍历省
             foreach (Object obj in list)
             {
                 T_AREA area = (T_AREA)obj;
                 TreeNode nodePro = new TreeNode(area.NAME);
                 nodePro.Tag = area.ID;
                 //根据省ID 即PID查询市 遍历市 把市节点加入省（即需要省ID 和省节点递归）
                 RecursionCity(nodePro, area);
                 //把省节点加入treeview
                 treeView1.Nodes.Add(nodePro);
             }
         }

         /// <summary>
         /// 递归加载市和县
         /// </summary>
         /// <param name="node">上一级节点，比如省节点</param>
         /// <param name="area">上一级对象，比如省，提供下一级的PID</param>
         private void RecursionCity(TreeNode node, T_AREA area)
         {
             List<Object> list = myORM_BLL.SelectModelByField(typeof(T_AREA), "PID=" + area.ID);
             foreach(Object obj in list)
             {
                 T_AREA areaCity = (T_AREA)obj;
                 TreeNode nodeCity = new TreeNode(areaCity.NAME);
                 nodeCity.Tag = areaCity.ID;
                 RecursionCity(nodeCity, areaCity); //再次递归获得县节点
                 node.Nodes.Add(nodeCity);
             }
         }

         /// <summary>
         /// 删除节点
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnDeleteNode_Click(object sender, EventArgs e)
         {
             //判断是否选中
             if (treeView1.SelectedNode == null)
             {
                 MessageBox.Show("请先选中要删除的节点");
                 return;
             }
             string name = treeView1.SelectedNode.Text;
             int id = (Int32)treeView1.SelectedNode.Tag;
             //提示是否删除
             if(MessageBox.Show("您确定要删除节点"+name+"吗？","提示",MessageBoxButtons.OKCancel,MessageBoxIcon.Warning)!=DialogResult.OK)
             {
                 return;
             }
             //根据ID删除 递归
             //在根据ID删除省之前，先要删除省下面所有的市，删除每个市之前，先要删除市下面所有的县
             RecursionDeleteCity(id);
             myORM_BLL.DeleteModelById(typeof(T_AREA), id);
             //重新加载数据
             MessageBox.Show("删除成功");
             LoadAlllNodes();
         }

         /// <summary>
         /// 根据省ID删除下面的所有市，递归 根据市ID删除下面的所有县
         /// </summary>
         /// <param name="id"></param>
         private void RecursionDeleteCity(int id)
         {
             //根据省ID查询所有市
             List<Object> list = myORM_BLL.SelectModelByField(typeof(T_AREA), "PID=" + id);
             //for市
             foreach(Object obj in list)
             {
                 T_AREA areaCity = (T_AREA)obj;
                 //根据市ID删除之前，先删除市下面的所有的县
                 RecursionDeleteCity(areaCity.ID);
                 myORM_BLL.DeleteModelById(typeof(T_AREA), areaCity.ID);
             }
         }

         /// <summary>
         /// 双击事件 进行编辑
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void treeView1_DoubleClick(object sender, EventArgs e)
         {
             //是否选中
             if (treeView1.SelectedNode == null)
             {
                 MessageBox.Show("请先选中要编辑的节点");
                 return;
             }
             //获得选中的节点
             TreeNode node = treeView1.SelectedNode;
             //设置节点为可编辑状态
             node.BeginEdit();
             //获得改变的文本
             T_AREA area=new T_AREA();
             area.NAME = node.Text.Trim();
             area.ID = (Int32)node.Tag;
             area.PID = node.Parent==null?:(Int32)node.Parent.Tag; //父节点pid
             //根据节点ID更新
             bool flag = myORM_BLL.UpdateModel(area);
             string msg = flag ? "更新成功" : "更新失败";
             MessageBox.Show(msg);
             //刷新
             LoadAlllNodes();
         }

         private event EventHandler _evt;
         private MyEventArg mea = new MyEventArg();

         /// <summary>
         /// 新增节点
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnAddNew_Click(object sender, EventArgs e)
         {
             //是否选中父节点，如果不选中，默认父节点为0
             TreeNode node = treeView1.SelectedNode;
             int id = node == null ?  : (Int32)node.Tag;
             //获得父节点ID,即PID
             mea.area = new T_AREA();
             mea.area.PID = id; //新增传PID
             AddNewAndEdit();
         }

         /// <summary>
         /// 编辑节点
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnEdit_Click(object sender, EventArgs e)
         {
             //是否选中
             if (treeView1.SelectedNode == null)
             {
                 MessageBox.Show("请先选中要编辑的节点");
                 return;
             }
             //获得节点ID
             int id = (Int32)treeView1.SelectedNode.Tag;
             mea.area = new T_AREA();
             mea.area.ID = id; //编辑传ID
             mea.area.PID = treeView1.SelectedNode.Parent == null ?  : (Int32)treeView1.SelectedNode.Parent.Tag;
             AddNewAndEdit();
         }

         /// <summary>
         /// 编辑和新增
         /// </summary>
         /// <param name="p"></param>
         private void AddNewAndEdit(int p)
         {
             mea.Tp = p;
             Form2 f2 = new Form2();
             //注册事件
             this._evt += new EventHandler(f2.SetText);
             if(this._evt!=null)
             {
                 this._evt(this, mea);
             }
             if (f2.ShowDialog() == DialogResult.OK)
             {
                 f2.Close();
                 LoadAlllNodes();
             }
             else if (f2.ShowDialog() == DialogResult.Cancel)
             {
                 f2.Close();
             }
         }
     }
     public class MyEventArg : EventArgs
     {
         /// <summary>
         /// 1 新增，2 编辑
         /// </summary>
         public int Tp { get; set; }
         /// <summary>
         /// 节点实例
         /// </summary>
         public T_AREA area { get; set; }
     }
 }

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using WinForm_CRUD.BLL;
 using WinForm_CRUD.Model;

 namespace WinForm_TestTree
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         MyORM_BLL myORM_BLL = new MyORM_BLL();

         /// <summary>
         /// import Area
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnImportArea_Click(object sender, EventArgs e)
         {

         }

         /// <summary>
         /// 窗口加载时 省市联动
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void Form1_Load(object sender, EventArgs e)
         {
             LoadAlllNodes();
         }

         /// <summary>
         /// 加载所有节点
         /// </summary>
         private void LoadAlllNodes()
         {
             treeView1.Nodes.Clear();
             //根据PID=0查询省
             List<Object> list = myORM_BLL.SelectModelByField(typeof(T_AREA), "PID=0");
             //for 遍历省
             foreach (Object obj in list)
             {
                 T_AREA area = (T_AREA)obj;
                 TreeNode nodePro = new TreeNode(area.NAME);
                 nodePro.Tag = area.ID;
                 //根据省ID 即PID查询市 遍历市 把市节点加入省（即需要省ID 和省节点递归）
                 RecursionCity(nodePro, area);
                 //把省节点加入treeview
                 treeView1.Nodes.Add(nodePro);
             }
         }

         /// <summary>
         /// 递归加载市和县
         /// </summary>
         /// <param name="node">上一级节点，比如省节点</param>
         /// <param name="area">上一级对象，比如省，提供下一级的PID</param>
         private void RecursionCity(TreeNode node, T_AREA area)
         {
             List<Object> list = myORM_BLL.SelectModelByField(typeof(T_AREA), "PID=" + area.ID);
             foreach(Object obj in list)
             {
                 T_AREA areaCity = (T_AREA)obj;
                 TreeNode nodeCity = new TreeNode(areaCity.NAME);
                 nodeCity.Tag = areaCity.ID;
                 RecursionCity(nodeCity, areaCity); //再次递归获得县节点
                 node.Nodes.Add(nodeCity);
             }
         }

         /// <summary>
         /// 删除节点
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnDeleteNode_Click(object sender, EventArgs e)
         {
             //判断是否选中
             if (treeView1.SelectedNode == null)
             {
                 MessageBox.Show("请先选中要删除的节点");
                 return;
             }
             string name = treeView1.SelectedNode.Text;
             int id = (Int32)treeView1.SelectedNode.Tag;
             //提示是否删除
             if(MessageBox.Show("您确定要删除节点"+name+"吗？","提示",MessageBoxButtons.OKCancel,MessageBoxIcon.Warning)!=DialogResult.OK)
             {
                 return;
             }
             //根据ID删除 递归
             //在根据ID删除省之前，先要删除省下面所有的市，删除每个市之前，先要删除市下面所有的县
             RecursionDeleteCity(id);
             myORM_BLL.DeleteModelById(typeof(T_AREA), id);
             //重新加载数据
             MessageBox.Show("删除成功");
             LoadAlllNodes();
         }

         /// <summary>
         /// 根据省ID删除下面的所有市，递归 根据市ID删除下面的所有县
         /// </summary>
         /// <param name="id"></param>
         private void RecursionDeleteCity(int id)
         {
             //根据省ID查询所有市
             List<Object> list = myORM_BLL.SelectModelByField(typeof(T_AREA), "PID=" + id);
             //for市
             foreach(Object obj in list)
             {
                 T_AREA areaCity = (T_AREA)obj;
                 //根据市ID删除之前，先删除市下面的所有的县
                 RecursionDeleteCity(areaCity.ID);
                 myORM_BLL.DeleteModelById(typeof(T_AREA), areaCity.ID);
             }
         }

         /// <summary>
         /// 双击事件 进行编辑
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void treeView1_DoubleClick(object sender, EventArgs e)
         {
             //是否选中
             if (treeView1.SelectedNode == null)
             {
                 MessageBox.Show("请先选中要编辑的节点");
                 return;
             }
             //获得选中的节点
             TreeNode node = treeView1.SelectedNode;
             //设置节点为可编辑状态
             node.BeginEdit();
             //获得改变的文本
             T_AREA area=new T_AREA();
             area.NAME = node.Text.Trim();
             area.ID = (Int32)node.Tag;
             area.PID = node.Parent==null?:(Int32)node.Parent.Tag; //父节点pid
             //根据节点ID更新
             bool flag = myORM_BLL.UpdateModel(area);
             string msg = flag ? "更新成功" : "更新失败";
             MessageBox.Show(msg);
             //刷新
             LoadAlllNodes();
         }

         private event EventHandler _evt;
         private MyEventArg mea = new MyEventArg();

         /// <summary>
         /// 新增节点
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnAddNew_Click(object sender, EventArgs e)
         {
             //是否选中父节点，如果不选中，默认父节点为0
             TreeNode node = treeView1.SelectedNode;
             int id = node == null ?  : (Int32)node.Tag;
             //获得父节点ID,即PID
             mea.area = new T_AREA();
             mea.area.PID = id; //新增传PID
             AddNewAndEdit();
         }

         /// <summary>
         /// 编辑节点
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnEdit_Click(object sender, EventArgs e)
         {
             //是否选中
             if (treeView1.SelectedNode == null)
             {
                 MessageBox.Show("请先选中要编辑的节点");
                 return;
             }
             //获得节点ID
             int id = (Int32)treeView1.SelectedNode.Tag;
             mea.area = new T_AREA();
             mea.area.ID = id; //编辑传ID
             mea.area.PID = treeView1.SelectedNode.Parent == null ?  : (Int32)treeView1.SelectedNode.Parent.Tag;
             AddNewAndEdit();
         }

         /// <summary>
         /// 编辑和新增
         /// </summary>
         /// <param name="p"></param>
         private void AddNewAndEdit(int p)
         {
             mea.Tp = p;
             Form2 f2 = new Form2();
             //注册事件
             this._evt += new EventHandler(f2.SetText);
             if(this._evt!=null)
             {
                 this._evt(this, mea);
             }
             if (f2.ShowDialog() == DialogResult.OK)
             {
                 f2.Close();
                 LoadAlllNodes();
             }
             else if (f2.ShowDialog() == DialogResult.Cancel)
             {
                 f2.Close();
             }
         }

         /// <summary>
         /// 加载 制定目录中的所有文件及目录
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnLoadAllDirectories_Click(object sender, EventArgs e)
         {
             //加载根目录，创建节点
             DirectoryInfo dir = new DirectoryInfo(@"G:\TianYu");
             TreeNode node = new TreeNode(dir.Name);
             //加入节点集合之前 需要先获得子目录，并都加入根节点 递归
             RecursionAddDirectory(node, dir);
             //加入treeview
             treeviewDirectories.Nodes.Add(node);
         }

         /// <summary>
         /// 递归 目录dir下的子目录和文件加入节点node的节点集合中
         /// </summary>
         /// <param name="node"></param>
         /// <param name="dir"></param>
         private void RecursionAddDirectory(TreeNode node, DirectoryInfo dir)
         {
             //获得目录dir下的所有字目录，加入node的节点集合，在加入节点node之前需要递归获取当前的子目录和文件
             DirectoryInfo[] dirs = dir.GetDirectories();
             foreach(DirectoryInfo direct in dirs)
             {
                 TreeNode nodeDir = new TreeNode(direct.Name);
                 RecursionAddDirectory(nodeDir, direct); //递归 direct目录下的子目录和文件 加入nodeDir下的节点集合
                 node.Nodes.Add(nodeDir);
             }
             //获得目录dir下的所有子文件，加入node的节点集合
             FileInfo[] files = dir.GetFiles();
                 foreach(FileInfo file in files)
                 {
                     TreeNode nodeFile = new TreeNode(file.Name);
                     node.Nodes.Add(nodeFile);
                 }
         }
     }
     public class MyEventArg : EventArgs
     {
         /// <summary>
         /// 1 新增，2 编辑
         /// </summary>
         public int Tp { get; set; }
         /// <summary>
         /// 节点实例
         /// </summary>
         public T_AREA area { get; set; }
     }
 }

树节点的处理