namespace RegeditManager
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //創(chuàng)建并寫入
        private void button1_Click(object sender, EventArgs e)
        {
            RegistryKey key = Registry.LocalMachine;
            try
            {
                RegistryKey software = key.CreateSubKey("software\\LabManager");
                software = key.OpenSubKey("software\\LabManager", true);
                software.SetValue("Address", @"C:\Program Files\實驗室管理系統(tǒng)\dbcom.xml");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            finally
            {
                key.Close();
            }
        }
        //讀取
        private void button2_Click(object sender, EventArgs e)
        {
            string info = string.Empty;
            RegistryKey key=Registry.LocalMachine;
            try
            {
                key = key.OpenSubKey("software\\LabManager");
                if (IsRegeditKeyExit("software\\LabManager", "Address"))
                {
                    info = key.GetValue("Address").ToString();
                    MessageBox.Show("注冊表里的信息為:" + info);
                }
                else
                {
                    MessageBox.Show("鍵值Address不存在;");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            finally
            {
                key.Close();
            }
        }
        //刪除
        private void button3_Click(object sender, EventArgs e)
        {
            RegistryKey key = Registry.LocalMachine;
            try
            {
                key = key.OpenSubKey("software\\LabManager",true);
                if (IsRegeditKeyExit("software\\LabManager", "Address"))
                {
                    key.DeleteValue("Address");
                    MessageBox.Show("刪除成功");
                }
                else
                {
                    MessageBox.Show("鍵值Address不存在;");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            finally
            {
                key.Close();
            }
        }

        /// <summary>
        /// 判斷鍵值是否存在
        /// </summary>
        /// <param name="RegistryStr">注冊表項</param>
        /// <param name="KeyStr">鍵值</param>
        /// <returns></returns>
        private bool IsRegeditKeyExit(string RegistryStr,string KeyStr)
        {
            string[] subkeyNames;

            RegistryKey hkml = Registry.LocalMachine;

            RegistryKey software = hkml.OpenSubKey(RegistryStr);

            subkeyNames = software.GetValueNames();

            foreach (string keyName in subkeyNames)
            {
                if (keyName == KeyStr)  //判斷鍵值的名稱
                {
                    hkml.Close();

                    return true;
                }
            }
            hkml.Close();

            return false;
        }

        /// <summary>
        /// 判斷注冊表項是否存在
        /// </summary>
        /// <param name="RegistryName">例如:SOFTWARE</param>
        /// <param name="ValueStr">例如:LabManager</param>
        /// <returns></returns>
        private bool IsRegeditItemExist(string RegistryName,string ValueStr)
        {
            string[] subkeyNames;

            RegistryKey hkml = Registry.LocalMachine;

            RegistryKey software = hkml.OpenSubKey(RegistryName);

            subkeyNames = software.GetSubKeyNames();

            //取得該項下所有子項的名稱的序列，并傳遞給預定的數(shù)組中

            foreach (string keyName in subkeyNames)  //遍歷整個數(shù)組
            {
                if (keyName == ValueStr) //判斷子項的名稱
                {
                    hkml.Close();
                    return true;
                }
            }
            hkml.Close();
            return false;

        }
    }
}