asp.net-core – 如何在.NET Core 2.0中使用PrincipalContext

我想再次验证用户的Active Directory,如下所示：

private static ClaimsIdentity ValidateUser(string userName,string password)
        {
            var domain = GetDomainByLogin(userName);

            using (var pc = new PrincipalContext(ContextType.Domain,domain,null,ContextOptions.Negotiate))
            {
                if (!pc.ValidateCredentials(userName,password)) return null;

                var user = UserPrincipal.FindByIdentity(pc,IdentityType.SamAccountName,userName);
                if (user == null)
                {
                    throw new Exception(UserNotFound);
                }

                var id = new ClaimsIdentity();

                id.AddClaim(new Claim(JwtClaimTypes.Subject,userName));
                id.AddClaim(new Claim(JwtClaimTypes.Name,userName));

                var groups = user.GetGroups();
                var roles = groups.Select(x => new Claim(JwtClaimTypes.Role,x.Name));

                id.AddClaims(roles);

                return id;
            }
        }

如何在.NET Core 2.0中使用PrincipalContext(System.DirectoryServices.AccountManagement)？