HttpContext。现在的使用者登录后未填充标识

Http.Context.Current.User

这是我的代码:

  Dim email As String = txtEmail.Text
            Dim password As String = txtPassword.Text
            Dim user As ApplicationUser

            If Session("LocalNetwork") Then
                Await _signInManager.PasswordSignInAsync(email, password, False, False))

                Dim y = HttpContext.Current.User.Identity.GetUserId

            End If

Web配置:

<authentication mode="None" />

有人知道为什么吗?