通过登入把用户信息和token加载到redis中去，

将token和部分用户信息存储在cookie中，

下次登入时 判断cookie的token在redis中是否存在，

存在就把用户信息加载出来自动登入。

 

public class LoginFormPrincipal : IPrincipal{private IIdentity _identity;public LoginFormPrincipal(LoginFormIdentity loginFormIdentity){if (loginFormIdentity == null){throw new ArgumentNullException("loginFormIdentity");}_identity = loginFormIdentity;}public IIdentity Identity{get{return _identity;}}public bool IsInRole(string role){throw new Exception("");}public bool SignOut(){FormsAuthentication.SignOut();HttpContext.Current.Session.Abandon();return true;}public static void SignIn(string CurrentId, string Token, int expiration){FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(2, CurrentId, DateTime.Now, DateTime.Now.AddDays(1), true, Token);string cookieValue = FormsAuthentication.Encrypt(ticket);HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, cookieValue);cookie.HttpOnly = true;cookie.Secure = FormsAuthentication.RequireSSL;cookie.Domain = FormsAuthentication.CookieDomain;cookie.Path = FormsAuthentication.FormsCookiePath;if (expiration > 0){cookie.Expires = DateTime.Now.AddMinutes(expiration);}HttpContext context = HttpContext.Current;if (context == null){throw new InvalidOperationException();}context.Response.Cookies.Remove(cookie.Name);context.Response.Cookies.Add(cookie);}private static FormsAuthenticationTicket TryParseAuthenticationTicket(HttpRequest request){if (request == null){throw new ArgumentNullException("request");}HttpCookie cookie = request.Cookies[FormsAuthentication.FormsCookieName];if (cookie == null || string.IsNullOrEmpty(cookie.Value)){return null;}try{return FormsAuthentication.Decrypt(cookie.Value);}catch{}return null;}private static LoginFormPrincipal TryParsePrincipal(HttpRequest request){FormsAuthenticationTicket ticket = TryParseAuthenticationTicket(request);if (ticket == null){return null;}int UserId = 0;if (!int.TryParse(ticket.Name, out UserId)){return null;}string Token = ticket.UserData;if (string.IsNullOrEmpty(Token)){return null;}return new LoginFormPrincipal(new LoginFormIdentity(UserId, Token));}public static void TrySetUserInfo(HttpContext context){if (context == null){throw new ArgumentNullException("context");}LoginFormPrincipal user = TryParsePrincipal(context.Request);if (user != null){HttpCookie cookie = context.Request.Cookies[FormsAuthentication.FormsCookieName];cookie.Expires = DateTime.Now.AddMinutes(20);context.Response.Cookies.Remove(cookie.Name);context.Response.Cookies.Add(cookie);context.User = user;string key = string.Format(RedisKeys.CurrentUser, user.Identity.Name + user.Identity.AuthenticationType);RedisBase.SetListExpire(key, DateTime.Now.AddMinutes(20));}else{context.User = user;HttpCookie cookie = context.Request.Cookies[FormsAuthentication.FormsCookieName];if (cookie != null){cookie.Expires = new DateTime(1970, 1, 1);context.Response.Cookies.Remove(FormsAuthentication.FormsCookieName);context.Response.Cookies.Add(cookie);}}}}public class LoginFormIdentity : IIdentity{private string _userId;private string _token;public LoginFormIdentity(int UserId, string Token){_userId = UserId.ToString();_token = Token;}public string AuthenticationType{get { return _token; }}public bool IsAuthenticated{get { return true; }}public string Name{get { return _userId; }}}