MVC项目后台管理，各页面判断登陆问题。

public class BaseController : Controller
{
protected string hostUrl = "";
/// <summary>
/// Action执行前判断
/// </summary>
/// <param name="filterContext"></param>
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
// url
this.hostUrl = "http://" + this.Request.Url.Host;
this.hostUrl += this.Request.Url.Port.ToString() == "80" ? "" : ":" + this.Request.Url.Port;
this.hostUrl += this.Request.ApplicationPath;

if (!this.checkLogin())// 判断是否登录
{
filterContext.Result = RedirectToRoute("Default",new{ Controller = "Login", Action = "Index" });
}

base.OnActionExecuting(filterContext);

}

/// <summary>
/// 判断是否登录
/// </summary>
protected bool checkLogin()
{
if (this.Session["userinfo"] == null)
{
return false;
}
return true;
}

}