Asp.net mvc 权限过滤和单点登录（禁止重复登录）

/// <summary>/// 用户权限控制/// </summary>public class UserAuthorize : AuthorizeAttribute{  /// <summary>  /// 授权失败时呈现的视图  /// </summary>  public string AuthorizationFailView { get; set; }  /// <summary>  /// 请求授权时执行  /// </summary>  /// <param name="filterContext">上下文</param>  public override void OnAuthorization(AuthorizationContext filterContext)  {    // 获取url请求里的 controller 和 action    string controllerName = filterContext.RouteData.Values["controller"].ToString();    string actionName = filterContext.RouteData.Values["action"].ToString();    // 获取用户信息    UserLoginBaseInfo _userLoginInfo = filterContext.HttpContext.Session[Property.UerLoginSession] as UserLoginBaseInfo;    //根据请求过来的controller和action去查询可以被哪些角色操作: 这是查询数据库 roleid使用 1,2,3,4格式    RoleWithControllerAction roleWithControllerAction =      SampleData.roleWithControllerAndAction.FirstOrDefault(r => r.ControllerName.ToLower() == controllerName.ToLower() && r.ActionName.ToLower() == actionName.ToLower() && r.RoleIds.contails("3"));    // 有值处理    if (roleWithControllerAction != null)    {      //有权限操作当前控制器和Action的角色id      this.Roles = roleWithControllerAction.RoleIds;    }    else    {      //请求失败输出空结果      filterContext.Result = new EmptyResult();      //打出提示文字      HttpContext.Current.Response.Write("对不起,你没有权限操作!");    }    base.OnAuthorization(filterContext);  }  /// <summary>  /// 自定义授权检查（返回False则授权失败）  /// </summary>  protected override bool AuthorizeCore(HttpContextBase httpContext)  {    //if (httpContext.User.Identity.IsAuthenticated)    //{    //  string userName = httpContext.User.Identity.Name;  //当前登录用户的用户名    //  User user = SampleData.users.Find(u => u.UserName == userName);  //当前登录用户对象    //  if (user != null)    //  {    //    Role role = SampleData.roles.Find(r => r.Id == user.RoleId); //当前登录用户的角色    //    foreach (string roleid in Roles.Split(','))    //    {    //      if (role.Id.ToString() == roleid)    //        return true;    //    }    //    return false;    //  }    //  else    //    return false;    //}    //else    //  return false;   //进入HandleUnauthorizedRequest    return true;  }  /// <summary>  /// 处理授权失败的HTTP请求  /// </summary>  protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)  {    if (string.IsNullOrWhiteSpace(AuthorizationFailView))      AuthorizationFailView = "error";    filterContext.Result = new ViewResult { ViewName = AuthorizationFailView };  }}

/// <summary>/// 限制一个用户只能登陆一次/// </summary>/// <returns></returns>private void GetOnline(){  string UserID = "1";  Hashtable SingleOnline = (Hashtable)System.Web.HttpContext.Current.Application[Property.Online];  if (SingleOnline == null)    SingleOnline = new Hashtable();  IDictionaryEnumerator idE = SingleOnline.GetEnumerator();  string strKey = string.Empty;  while (idE.MoveNext())  {    if (idE.Value != null && idE.Value.ToString().Equals(UserID))    {      //already login       strKey = idE.Key.ToString();      //当前用户已存在移除、      SingleOnline.Remove(strKey);      System.Web.HttpContext.Current.Application.Lock();      System.Web.HttpContext.Current.Application[Property.Online] = SingleOnline;      System.Web.HttpContext.Current.Application.UnLock();      break;    }  }  //SessionID  if (!SingleOnline.ContainsKey(Session.SessionID))  {    SingleOnline[Session.SessionID] = UserID;    System.Web.HttpContext.Current.Application.Lock();    System.Web.HttpContext.Current.Application[Property.Online] = SingleOnline;    System.Web.HttpContext.Current.Application.UnLock();  }}

/// <summary> /// 用户基础信息过滤器 /// </summary> public class LoginActionFilter : ActionFilterAttribute {   /// <summary>   /// 初始化地址   /// </summary>   public const string Url = "~/Login/Index?error=";   /// <summary>   /// 该方法会在action方法执行之前调用    /// </summary>   /// <param name="filterContext">上下文</param>   public override void OnActionExecuting(ActionExecutingContext filterContext)   {     // 获取上一级url     // var url1 = filterContext.HttpContext.Request.UrlReferrer;     UserLoginBaseInfo _userLogin = filterContext.HttpContext.Session[Property.UerLoginSession] as UserLoginBaseInfo;     // 用户是否登陆     if (_userLogin == null)     {       filterContext.Result = new RedirectResult(Url + "登陆时间过期,请重新登陆!&url=" + filterContext.HttpContext.Request.RawUrl);     }     else     {       filterContext.HttpContext.Session.Timeout = 30;     }     //判断是否在其它地方登录     Hashtable singleOnline = (Hashtable)System.Web.HttpContext.Current.Application[Property.Online];     // 判断当前SessionID是否存在     if (singleOnline != null && !singleOnline.ContainsKey(HttpContext.Current.Session.SessionID))       filterContext.Result = new RedirectResult(Url + "你的帐号已在别处登陆，你被强迫下线!");     base.OnActionExecuting(filterContext);   }   /// <summary>   /// 执行后   /// </summary>   /// <param name="filterContext"></param>   public override void OnResultExecuting(ResultExecutingContext filterContext)   {     //记录操作日志，写进操作日志中     var controllerName = filterContext.RouteData.Values["controller"];     var actionName = filterContext.RouteData.Values["action"];     base.OnResultExecuting(filterContext);   }

/// <summary>/// Session销毁/// </summary>protected void Session_End(){  Hashtable SingleOnline = (Hashtable)Application[Property.Online];  if (SingleOnline != null && SingleOnline[Session.SessionID] != null)  {    SingleOnline.Remove(Session.SessionID);    Application.Lock();    Application[Property.Online] = SingleOnline;    Application.UnLock();  }  Session.Abandon();}