treeView控件应用-IE地址栏下拉列表清理实例

 新建一个项目,在窗体上添加一个treeView控件,名称默认treeView1,checkBoxes属性设为True,添加两个按钮button1和button2,text属性分别改成"清理选中项"和"刷新",再添加一个checkBox1.

窗体代码如下:

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;
using  Microsoft.Win32;
using  System.Diagnostics;

namespace  URL_Address_Clean
... {
    public partial class Form1 : Form
    ...{
        public string[] ValueName=new string[100];  //定义一个一维数组,用来存储值的名称,因为在删除地址时要用到

        public Form1()
        ...{
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        ...{
            GetURL();
        }

        /**//// <summary>
        /// 从注册表中取得IE地址栏下拉列表中的地址
        /// </summary>
        private void GetURL()
        ...{
            RegistryKey myKey = Registry.CurrentUser.CreateSubKey("Software/Microsoft/Internet Explorer/TypedURLs");
            string[] Values = myKey.GetValueNames();
            object ValueData;

            treeView1.Nodes.Clear();    //每次操作之前都先清空treeView1中的所有节点
            TreeNode pNode;
            pNode = treeView1.Nodes.Add("IE地址栏下拉列表");    //添加根节点

            for (int i = 0; i < Values.Length; i++)
            ...{
                ValueName[i] = Values[i];   //保存值的名称,删除的时候需要
                ValueData = myKey.GetValue(ValueName[i]);
                pNode.Nodes.Add(ValueData.ToString());  //添加子节点
            }

            myKey.Close();
            treeView1.ExpandAll();
        }

        /**//// <summary>
        /// 删除选中的地址
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        ...{
            RegistryKey myKey = Registry.CurrentUser.CreateSubKey("Software/Microsoft/Internet Explorer/TypedURLs");

            for (int i = 0; i < treeView1.GetNodeCount(true)-1; i++)
            ...{
                if (treeView1.Nodes[0].Nodes[i].Checked)
                ...{
                    myKey.DeleteValue(ValueName[i],false);  //ValueName[i]即是地址treeView1.Nodes[0].Nodes[i].Text在注册表中对应的值的名称
                }
            }

            myKey.Close();
            GetURL();
        }

        /**//// <summary>
        /// 调用GetURL()函数来刷新
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        ...{
            GetURL();
        }

        /**//// <summary>
        /// 选中根节点时,将其子节点全选中,否则全取消
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
        ...{
            if (e.Node.Level==0) //如果是根节点
            ...{
                TreeNode cNode;
                if (e.Node.Checked)
                ...{
                    cNode = e.Node.FirstNode;
                    for (int i = 1; i <= e.Node.GetNodeCount(true); i++)
                    ...{
                        cNode.Checked = true;
                        cNode = cNode.NextNode;
                    }
                }
                else
                ...{
                    cNode = e.Node.FirstNode;
                    for (int i = 1; i <= e.Node.GetNodeCount(true); i++)
                    ...{
                        cNode.Checked = false;
                        cNode = cNode.NextNode;
                    }
                }
            }
        }

        /**//// <summary>
        /// 节点双击的时候在IE中打开相应的地址
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        ...{
            if (e.Node.Level == 0) return;  //如果是根节点,返回
            if (checkBox1.Checked)
            ...{
                ProcessStartInfo StartInfo = new ProcessStartInfo("IExplore.exe");
                StartInfo.WindowStyle = ProcessWindowStyle.Maximized;
                StartInfo.Arguments = e.Node.Text;
                Process.Start(StartInfo);
            }
        }
    }
}