using System; namespace Backend {     public class RegistryStorage     {         public static PageVisibility OpenAfterStart()         {             Microsoft.Win32.RegistryKey registryKey;             PageVisibility visibility = PageVisibility.Visible;             // HKCU\Software\RegeditStorage             registryKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\RegistryStorage");             if (registryKey != null)             {                 visibility = (string)registryKey.GetValue("PageVisibility") == PageVisibility.Hide.ToString() ?                     PageVisibility.Hide : PageVisibility.Visible;                 registryKey.Close();             }             return visibility;         }         public static void SaveBeforeExit(PageVisibility visibility)         {             Microsoft.Win32.RegistryKey registryKey;             // HKCU\Software\RegeditStorage             registryKey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(@"Software\RegistryStorage");             registryKey.SetValue("PageVisibility", visibility.ToString());             registryKey.Close();         }     }     public enum PageVisibility     {         Visible,         Hide     } }

using System; using System.Diagnostics; namespace Backend.Test {     class Program     {         static void Main(string[] args)         {             // 存值             RegistryStorage.SaveBeforeExit(PageVisibility.Hide);             // 取值             PageVisibility visibility = RegistryStorage.OpenAfterStart();             // 验证             Debug.Assert(visibility == PageVisibility.Hide);                // 存值             RegistryStorage.SaveBeforeExit(PageVisibility.Visible);             // 取值             visibility = RegistryStorage.OpenAfterStart();             // 验证             Debug.Assert(visibility == PageVisibility.Visible);             Console.WriteLine("Press any key to exit.");             Console.ReadKey();         }     } }