/// <summary>
 /// 验证短信验证码是否正确。
 /// </summary>
 /// <param name="phoneNumber"></param>
 /// <param name="code"></param>
 /// <returns></returns>
 public async Task <bool> ValidateAsync(string phoneNumber, string code)
 {
     using (var client = new ValidationCodeSvc.VerificationCodeClient())
     {
         return(await client.VerifyAsync(phoneNumber, code));
     }
 }