ASP.Net MVC AjaxSession過期提示

創建過濾器

public class BasicAjaxAuthAttribute : AuthorizeAttribute
{
    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        if (IsAjaxRequestAndNonExistsSession(filterContext))
        {
            AlertMessage(filterContext);
        }
    }

    private bool IsAjaxRequestAndNonExistsSession(AuthorizationContext filterContext)
    {
        return filterContext.HttpContext.Request.IsAjaxRequest() && filterContext.HttpContext.Session == null;
    }
    private void AlertMessage(AuthorizationContext filterContext)
    {
        ContentResult errorResult = new ContentResult();
        errorResult.Content = new AjaxResult { state = ResultType.error.ToString(), message = "長時間未操作，請重新登錄。" }.ToJson();
        filterContext.Result = errorResult;
    }
}

應用在Action方法上

[BasicAjaxAuth]
public ActionResult DeleteUser(string userId)
{
    ...
}