using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Win32;
namespace BugsBox.Application.Core
{
    public class WindowsRegistry
    {


        const string REGISTRY_ITEM_PATH = "software\\pharmacyinst";
        /// <summary>
        /// 創建註冊表項
        /// </summary>
        /// <param name="registryItemPath"></param>
        public static void CreateRegistry(string registryItemPath = REGISTRY_ITEM_PATH)
        {
            RegistryKey key = Registry.LocalMachine;
            RegistryKey software = key.CreateSubKey(registryItemPath);
            //在HKEY_LOCAL_MACHINE\SOFTWARE下新建名為test的註冊表項。如果已經存在則不影響！
        }

        /// <summary>
        /// 獲取註冊表值
        /// </summary>
        /// <returns></returns>
        public static string GetRegistryValue(string key, string registryItemPath = REGISTRY_ITEM_PATH)
        {
            string info = "";
            RegistryKey Key;
            Key = Registry.LocalMachine;
            var myreg = Key.OpenSubKey(registryItemPath);
            info = myreg.GetValue(key).ToString();
            myreg.Close();
            return info;
        }

        /// <summary>
        /// 修改註冊表項值
        /// </summary>
        /// <param name="subKey"></param>
        /// <param name="val"></param>
        /// <param name="registryItemPath"></param>
        public static void SetRegistryValue(string subKey, string val, string registryItemPath = REGISTRY_ITEM_PATH)
        {
            using (RegistryKey key = Registry.LocalMachine)
            {
                RegistryKey software = key.OpenSubKey(registryItemPath, true); //該項必須已存在
                software.SetValue(subKey, val);
                //在HKEY_LOCAL_MACHINE\SOFTWARE\test下創建一個名為“test”，值為“博客園”的鍵值。如果該鍵值原本已經存在，則會修改替換原來的鍵值，如果不存在則是創建該鍵值。
                // 註意：SetValue()還有第三個參數，主要是用於設置鍵值的類型，如：字符串，二進制，Dword等等~~默認是字符串。如：
                // software.SetValue("test", "0", RegistryValueKind.DWord); //二進制信息
                key.Close();
            }
        }



        /// <summary>
        /// 刪除註冊表項
        /// </summary>
        public static void DeleteRegistry(string registryItemPath = REGISTRY_ITEM_PATH)
        {
            RegistryKey key = Registry.LocalMachine;
            key.DeleteSubKey(registryItemPath, true); //該方法無返回值，直接調用即可
            key.Close();
        }

        /// <summary>
        /// 刪除註冊表值
        /// </summary>
        public static void DeleteRegistryValue(string subKey, string registryItemPath = REGISTRY_ITEM_PATH)
        {
            RegistryKey delKey = Registry.LocalMachine.OpenSubKey(registryItemPath, true);
            delKey.DeleteValue(subKey);
            delKey.Close();
        }

        /// <summary>
        /// 判斷註冊表項是否存在
        /// </summary>
        /// <returns></returns>
        public static bool IsRegeditItemExist()
        {
            string[] subkeyNames;
            RegistryKey hkml = Registry.LocalMachine;
            RegistryKey software = hkml.OpenSubKey("SOFTWARE");
            //RegistryKey software = hkml.OpenSubKey("SOFTWARE", true);  
            subkeyNames = software.GetSubKeyNames();
            //取得該項下所有子項的名稱的序列，並傳遞給預定的數組中  
            foreach (string keyName in subkeyNames)
            //遍歷整個數組  
            {
                if (keyName == "test")
                //判斷子項的名稱  
                {
                    hkml.Close();
                    return true;
                }
            }
            hkml.Close();
            return false;
        }
        /// <summary>
        /// 判斷鍵值是否存在
        /// </summary>
        /// <returns></returns>
        public static bool IsRegeditKeyExist(string subKey, string registryItemPath = REGISTRY_ITEM_PATH)
        {
            string[] subkeyNames;
            RegistryKey hkml = Registry.LocalMachine;
            RegistryKey software = hkml.OpenSubKey(registryItemPath);
            //RegistryKey software = hkml.OpenSubKey("SOFTWARE\\test", true);
            subkeyNames = software.GetValueNames();
            //取得該項下所有鍵值的名稱的序列，並傳遞給預定的數組中
            foreach (string keyName in subkeyNames)
            {
                if (keyName == subKey) //判斷鍵值的名稱
                {
                    hkml.Close();
                    return true;
                }

            }
            hkml.Close();
            return false;
        }
    }
}

C# 操作註冊表WindowsRegistry