asp.net TreeView控件的用法

最新推荐文章于 2025-05-29 17:00:00 发布

chinaly

最新推荐文章于 2025-05-29 17:00:00 发布

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文章标签： asp.net class null server sql asp

本文链接：https://blog.youkuaiyun.com/chinaly/article/details/2952002

本文介绍了ASP.NET中的TreeView控件，包括其基本属性如ImageSet、NodeIndent和ShowLines的设置，以及事件处理如OnSelectedNodeChanged。示例代码展示了如何在页面中创建并配置TreeView控件，同时提供了选中节点改变时的事件响应方法。

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html

  <asp:Panel id="panel1" runat="server" Height="300" ScrollBars="Auto">
                                    <asp:TreeView ID="PART_VIEW" runat="server" ImageSet="Simple" NodeIndent="10" ShowLines="True" AutoGenerateDataBindings="False" ExpandDepth="1" OnSelectedNodeChanged="PART_VIEW_SelectedNodeChanged">
                                        <NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="0px" NodeSpacing="0px" VerticalPadding="0px" />
                                        <SelectedNodeStyle Font-Underline="True" ForeColor="#DD5555" HorizontalPadding="0px" VerticalPadding="0px" />
                                        <HoverNodeStyle Font-Underline="True" ForeColor="#DD5555" />
                                        <ParentNodeStyle Font-Bold="False" />
                                    </asp:TreeView>
                                </asp:Panel>

C# Code

public class TreeView_Class :TreeView
{
       private DataSet ds = null;
        /// <summary> 
        ///  
        /// </summary> 
        ///  
        public TreeView_Class(): base()
        {
        }
        /// <summary> 
        ///  
        /// </summary> 
        /// <param name="ds"></param> 
        public TreeView_Class(DataSet ds)
        {
            this.ds = ds;
        }
        public void SetDataSet(DataSet ds)
        {
            this.ds = ds;
        }
        /// <summary> 
        /// 建樹不帶參數 
        /// </summary> 
        public TreeNode BuildTree()
        {
            //if (ds == null) 
            //{ 
            //    return ""; 
            //} 
            this.Nodes.Clear();
            TreeNode root = new TreeNode("物料類別");
            CreatTreeNodes newNode = null;
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                newNode = new CreatTreeNodes(ds.Tables[0].Rows[i][1].ToString());
                newNode.Value = ds.Tables[0].Rows[i][0].ToString();
                // newNode.FunctionCode = ds.Tables[0].Rows[i][3].ToString(); 
                if (ds.Tables[0].Rows[i]["cata_pid"].ToString() == "0")
                {
                    root.ChildNodes.Add(newNode);
                }
                else
                {
                    AddChildNodes(root, newNode, ds.Tables[0].Rows[i]["cata_pid"].ToString());
                }
            }
            root.Expand();
            return root;
        }
        /// <summary> 
        ///  
        /// </summary> 
        /// <param name="root">父節點</param> 
        /// <param name="newnode">節點</param> 
        /// <param name="prentID">節點的序列號</param> 
        public void AddChildNodes(TreeNode root, TreeNode newnode, string prentID)
        {
            if (root.Value!= null && prentID.Equals(root.Value.ToString()))
            {
                root.ChildNodes.Add(newnode);
            }
            else
            {
                for (int i = 0; i < root.ChildNodes.Count; i++)
                {
                    if (prentID == root.ChildNodes[i].Value.ToString())
                    {
                        root.ChildNodes[i].ChildNodes.Add(newnode);
                    }
                    else
                    {
                        AddChildNodes(root.ChildNodes[i], newnode, prentID);
                    }
                    //root.Expand(); 
                }
            }
        }
        /// <summary> 
        /// 建樹(包含權限的字段) 
        /// </summary> 
        /// <param name="ch">字符要顯示的標題</param> 
        /// <param name="one">要顯示給客戶看的字段(指數據庫的字段)</param> 
        /// <param name="two">權限的字段(指數據庫的字段)</param> 
        public void BuildTree(string ch, string one, string two)
        {
            this.Nodes.Clear();
            TreeNode root = new TreeNode(ch);
            CreatTreeNodes newnode = null;
            this.Nodes.Add(root);
            int j = ds.Tables[0].Rows.Count;
            for (int i = 0; i < j; i++)
            {
                newnode = new CreatTreeNodes(ds.Tables[0].Rows[i][one].ToString());
                newnode.Value = ds.Tables[0].Rows[i][0].ToString();
                if (newnode.FunctionCode != null)
                {
                    newnode.FunctionCode = ds.Tables[0].Rows[i][two].ToString();
                }
                if (ds.Tables[0].Rows[i][two].ToString() == null || ds.Tables[0].Rows[i][two].ToString() == "")
                {
                    root.ChildNodes.Add(newnode);
                }
                else
                {
                    AddChildNodes(root, newnode, ds.Tables[0].Rows[i][two].ToString());
                }
                root.Expand();
            }
        }
        // 
        public class CreatTreeNodes : TreeNode
        {
            private object functionCode;
            //凳婖滲杅參趼睫珆尨堤懂 
            //彆羶衄參趼睫蛌徹饒繫攷憩珆尨諾 
            public CreatTreeNodes(string text)
                : base(text)
            {
            }
            //權限  
            public object FunctionCode
            {
                get { return functionCode; }
                set { functionCode = value; }
            }
            //蘇凳婖源楊 
            //彆狟醱羶衄赽誹萸憩珆尨諾 
            public CreatTreeNodes()
                : base()
            {
                this.functionCode = null;
            }
        }
}

aspx.cs

 private void bind()
    {
        DataSet ds=new DataSet();
        sql ="SELECT CATA_ID,CATA_NAME,CATA_PID FROM BASE_CATA";
        ds = return_PartMater(sql); --方法返回一个DataSet
        TreeNode node=new TreeNode();
        TreeView_Class treeview = new TreeView_Class(ds);
        this.PART_VIEW.Nodes.Add(treeview.BuildTree());
        --调用上面写的一个TreeView类
    }