如何在ASP.NET Core 2.0中验证Active Directory用户？

Question

我有代码来验证Active Directory中的用户，这些用户是用Core 1.0编写的，但现在我需要在Core 2.0中编写相同的代码，其中不支持Memebership.ValidateUser（）方法。如何在Core 2.0中验证Active Directory用户？请参阅我已有的代码。

 [HttpPost]
    public ActionResult Index(Users objUser)
    {
        bool isValid = Membership.ValidateUser(objUser.UserName, objUser.Password);
        HttpContext.Session.Add("User", objUser.UserName);
        HttpContext.Session.Add("isAthorizedGroup", 1);
        if (validateUser(objUser))
        {
            if (isValid)
            {
                var identity = new ClaimsIdentity(new[] {
            new Claim(ClaimTypes.Name, objUser.UserName),
            new Claim(ClaimTypes.NameIdentifier, objUser.UserName ),
             }, DefaultAuthenticationTypes.ApplicationCookie);
                var ctx = Request.GetOwinContext();
                var authManager = ctx.Authentication;
                authManager.SignOut(DefaultAuthenticationTypes.ExternalCookie);
                authManager.SignIn(new AuthenticationProperties() { IsPersistent = false }, identity);
                User.Identity.Name.ToString();
                return Redirect("/DefaultPage");
            }
        }
        ViewData["ErrorMessage"] = "Invalid Username or Password";
        return View();// RedirectToAction("Index", new { msgError = "Invalid Username or Password" });
    }