WinForm control of the TreeView []

basic introduction

Hierarchical collection of controls (tree control) label for the item, picture display can be loaded nodes.

Chang set properties

CheckBoxes : whether the check box next to the tree nodes display;

FullRowSelect : indicates whether to highlight the entire width of the spanning tree view control;

Indent : the indent of each sub-tree node level;

ItemHeight : TreeView control the height of each tree node;

The LabelEdit : Indicates whether the tree node label text editor;

Used by the Scrollable : Indicates whether the tree view control displays scroll bars when needed;

ShowPlusMinus : indicates whether the next subtree node tree nodes comprises a display plus / minus buttons;

ShowRootLines : Indicates whether the connection between the root of the tree at the node tree view;

Name : the name used to identify the code indicative of the object;

 

Case example

 

 

The relevant code

        private void btn_LoadData_Click(object sender, EventArgs e)
        {
            //设置树形组件的基础属性
            treeView1.CheckBoxes = true;
            treeView1.FullRowSelect = true;
            treeView1.Indent = 20;
            treeView1.ItemHeight = 20;
            treeView1.LabelEdit = false;
            treeView1.Scrollable = true;
            treeView1.ShowPlusMinus = true;
            treeView1.ShowRootLines = true;


            //需要加载树形的源数据
            string[] strData = { "1;内地;柳岩",
                                 "2;内地;杨幂",
                                 "3;欧美;卡戴珊",
                                 "4;日韩;李成敏",
                                 "5;日韩;宇都宫紫苑"};

            //解析到DataTable数据集
            DataTable dtData = new DataTable();
            dtData.Columns.Add("ID");
            dtData.Columns.Add("GROUP");
            dtData.Columns.Add("NAME");

            foreach (string item in strData)
            {
                string[] values = item.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
                if (values.Length == 3)
                {
                    DataRow row = dtData.NewRow();
                    row["ID"] = values[0];
                    row["GROUP"] = values[1];
                    row["NAME"] = values[2];
                    dtData.Rows.Add(row);
                }
            }


            TreeNode tn = new TreeNode();
            tn.Name = "全部";
            tn.Text = "全部";


            //将数据集加载到树形控件当中
            foreach (DataRow row in dtData.Rows)
            {
                string strValue = row["GROUP"].ToString();
                if (tn.Nodes.Count > 0)
                {
                    if (!tn.Nodes.ContainsKey(strValue))
                    {
                        BindTreeData(tn, dtData, strValue);
                    }
                }
                else
                {
                    BindTreeData(tn, dtData, strValue);
                }
            }

            treeView1.Nodes.Add(tn);
            treeView1.ExpandAll();
        }

        private void BindTreeData(TreeNode tn, DataTable dtData, string strValue)
        {
            TreeNode tn1 = new TreeNode();
            tn1.Name = strValue;
            tn1.Text = strValue;
            tn.Nodes.Add(tn1);

            DataRow[] rows = dtData.Select(string.Format("GROUP='{0}'", strValue));
            if (rows.Length > 0)
            {
                foreach (DataRow dr in rows)
                {
                    TreeNode tn2 = new TreeNode();
                    tn2.Name = dr["GROUP"].ToString();
                    tn2.Text = dr["NAME"].ToString();
                    tn1.Nodes.Add(tn2);
                }
            }
        }

        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
        {
            //鼠标勾选树节点时需要使树节点为选中状态，反之忽略
            if (isMouseClick)
            {
                treeView1.SelectedNode = e.Node;
            }

            //获取勾选项名称
            StringBuilder sb = new StringBuilder();
            GetTreeNodesCheckName(sb, treeView1.Nodes);
            txt_CheckValue.Text = sb.ToString().Trim(';');
        }

        private void GetTreeNodesCheckName(StringBuilder sb, TreeNodeCollection tnc)
        {
            foreach (TreeNode item in tnc)
            {
                if (item.Checked) { sb.AppendFormat("{0};", item.Text); }

                GetTreeNodesCheckName(sb, item.Nodes);
            }
        }

        bool isMouseClick = true;
        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            //选中或勾选树节点时触发子树节点或父树节点的逻辑操作
            isMouseClick = false;

            SetCheckedChildNodes(e.Node, e.Node.Checked);

            SetCheckedParentNodes(e.Node, e.Node.Checked);

            isMouseClick = true;
        }

        //树节点的父树节点逻辑操作
        private static void SetCheckedParentNodes(TreeNode tn, bool CheckState)
        {
            if (tn.Parent != null)
            {
                //当选中树节点勾选后同级所有树节点都勾选时，父树节点为勾选状态；
                //当选中树节点中的同级树节点其中有一个树节点未勾选则父树节点为未勾选状态；
                bool b = false;
                for (int i = 0; i < tn.Parent.Nodes.Count; i++)
                {
                    bool state = tn.Parent.Nodes[i].Checked;
                    if (!state.Equals(CheckState))
                    {
                        b = !b;
                        break;
                    }
                }
                tn.Parent.Checked = b ? (Boolean)false : CheckState;

                SetCheckedParentNodes(tn.Parent, CheckState);
            }
        }

        //树节点的子树节点逻辑操作
        private static void SetCheckedChildNodes(TreeNode tn, bool CheckState)
        {
            if (tn.Nodes.Count > 0)
            {
                //当前树节点状态变更，子树节点同步状态
                foreach (TreeNode tn1 in tn.Nodes)
                {
                    tn1.Checked = CheckState;

                    SetCheckedChildNodes(tn1, CheckState);
                }
            }
        }