mvc 添加过滤器并添加session缓存判断

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功能实现:

登录时添加session缓存.判断是否登录过期.

1.判断是否需要登录判断

public static AdminLoginUser GetAdminLoginUser()
{
#region 获取当前登录者信息
AdminLoginUser result = null;
try
{
if (HttpContext.Current.Session["User"] != null)
{
result = HttpContext.Current.Session["User"] as AdminLoginUser;
}
else
{
result = null;
}
}
catch (Exception ex)
{
//TTracer.WriteLog(ex.ToString());
}
return result;
#endregion
}

public class SessionAndAuthority : ActionFilterAttribute//ActionFilterAttribute是Action过滤类,该属于会在执行一个action之前先执行.
{
//后台登录用户
protected AdminLoginUser adminloginUser
{
get
{
return Test1.Common.UserHelper.GetAdminLoginUser();
}
} /// <summary>
/// 使用验证时 [NoSign] 标注不需要登录和权限验证
/// </summary>
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true)]
public class NoSignAttribute : Attribute
{
} //操作是否需要判断
private static bool SkipNoSign(ActionExecutingContext actionContext)
{
return actionContext.ActionDescriptor.GetCustomAttributes(typeof(NoSignAttribute), true).Length == ;//有NoSign属性 true
} //在执行操作方法之前判断登录情况和页面权限
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (SkipNoSign(filterContext))//是否该类标记为NoSign，如果是则不需要判断
{
base.OnActionExecuting(filterContext);
return;
} #region 先判断session
if (null == adminloginUser)
{
//session 过期
if (!filterContext.HttpContext.Request.IsAjaxRequest())
{
// 请求跳转到Tip页面
filterContext.Result = new RedirectResult("/Home/Tip?state=0");
}
else
{
//ajax请求返回json格式提示
if (filterContext.HttpContext.Request.HttpMethod == "GET")
{
filterContext.Result = new RedirectResult("/Home/Tip?state=0");
}
else
{
ContentResult content = new ContentResult();
ResultMessage msg = new ResultMessage() { success = false, message = "登录已过期，请重新登录！" };
content.Content = msg.ToJson();
filterContext.Result = content;
}
}
}
#endregion
}
}