WinForm控件之【TreeView】

基本介绍

标签项的分层集合控件(树形控件),节点可加载图片显示。

常设置属性

CheckBoxes:树节点旁是否显示复选框;

FullRowSelect:指示突出显示是否跨越树视图控件的整个宽度;

Indent:每个子树节点级别的缩进距离;

ItemHeight:树视图控件中每个树节点的高度;

LabelEdit:指示是否可以编辑树节点的标签文本;

Scrollable:指示树视图控件是否在需要时显示滚动条;

ShowPlusMinus:指示是否在包含子树节点的树节点旁边显示加/减按钮;

ShowRootLines:指示是否在树视图根处的树节点之间显示连线;

Name:指示代码中用来标识该对象的名称;

 

事例举例

WinForm控件之【TreeView】

 

WinForm控件之【TreeView】WinForm控件之【TreeView】

 

相关代码

        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);
                }
            }
        }

 

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