identity server4里遇到：User name '' is invalid, can only contain letters or digits的解決方式

        private readonly UserManager<IdentityUser> _userManager;
        private readonly RoleManager<IdentityRole> _roleManager;
        public HomeController(IIdentityServerInteractionService interaction, UserManager<IdentityUser> userManager, RoleManager<IdentityRole> roleManager, IWebHostEnvironment environment)
        {
            _roleManager = roleManager;
            _userManager = userManager;
            _interaction = interaction;
            Environment = environment;

 _roleManager.RoleValidators.Clear(); userManager.UserValidators.Clear();
        }

_roleManager.RoleValidators.Clear();
userManager.UserValidators.Clear();

上面的就是把驗證的機制去掉，就允許中文了