实现双击文件调用系统已安装的程序打开此文件 并设置文件的图标

    /// <summary>
    /// 注册表操作类
    /// </summary>
    public static class RegistryKeyOperator
    {
        public  const string Extension = ".space";

        /// <summary>
        /// 创建文件关联注册表 已存在则跳过
        /// </summary>
        public static void CreatFileLinkRegistry()
        {
            if (MatchRegistryKey()) return;
            try
            {
                //文件注册
                var registryKey = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey(Extension);
                //设置默认图标
                var iconKey = registryKey?.CreateSubKey("DefaultIcon");
                if (iconKey == null) return;
                iconKey.SetValue("", Application.StartupPath + "\Image.ico");
                //设置默认打开程序路径
                var comRegistryKey = registryKey.CreateSubKey("shell\open\command");
                if (comRegistryKey == null) return;
                comRegistryKey.SetValue("", Application.ExecutablePath + " %1");
                //关闭
                registryKey.Close();
            }
            catch
            {
                MessageBox.ShowError("请以管理员身份运行此程序！");
            }
        }
        private static bool MatchRegistryKey()
        {
            //获取信息
            var registryKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(Extension);
            if (registryKey?.OpenSubKey("shell")?.OpenSubKey("open")?.OpenSubKey("command") == null) return false;

            var comRegistryKey = registryKey.OpenSubKey("shell")?.OpenSubKey("open")?.OpenSubKey("command");

            var varValue = comRegistryKey?.GetValue("");
            if (Equals(varValue, Application.ExecutablePath + " %1"))
            {
                return true;
            }
            Microsoft.Win32.Registry.ClassesRoot.DeleteSubKeyTree(Extension, false);
            return false;
        }
    }