Question

我试图从会话UserId中获取当前用户，但出现此错误。 “无法将类型为'System.Int32'的对象转换为类型为'Trinity.Models.tblUser'。”

我在哪里创建会话ID：

[HttpPost]
public ActionResult Authorise(tblUser user)
{
    using (var db = new TrinityEntities())
    {
        var userEmail = db.tblUsers.FirstOrDefault(x => x.Email == user.Email);
        var userPassword = db.tblUsers.FirstOrDefault(y => y.Password == user.Password);

        //check login incorrect
        if (userEmail == null || userPassword == null)
        {
            ViewBag.LoginIncorrect = "E-mail or Password not correct";
            return View("Index", user);
        }
        else
        {
            Session["UserID"] = userEmail.Id;
            return RedirectToAction("Index", "Home");
        }
    }
}

出现错误的地方：

public ActionResult Index()
{
    if (Session["UserID"] == null)
    {
        return Redirect("/");
    }

    var currentUser = (Models.tblUser) Session["UserID"];

    using (var db = new Models.ChatContext())
    {
        ViewBag.allUsers = db.Users.Where(u => u.FirstName != currentUser.FirstName).ToList();
    }

    ViewBag.currentUser = currentUser;

    return View();
}

Answer 1

您只存储ID（一个数字），但是当您读回ID时，您会期望整个用户都无法使用。相反，您需要使用ID重新加载用户：

var currentUserId = Session["UserID"];
var user = db.tblUsers.FirstOrDefault(x => x.Id == currentUserId);

无法将会话用户标识转换为数据库

1 个答案: