[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
    public sealed class NotDefaultValueAttribute : ValidationAttribute, IClientValidatable
    {
        public string InputString { get; set; }
        public NotDefaultValueAttribute()
        {
            ErrorMessage = "請(qing)選其中一項";
        }
        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            ModelClientValidationRule rule = new ModelClientValidationRule
           {
               ValidationType = "notdefaultvalue",
               ErrorMessage = FormatErrorMessage(metadata.GetDisplayName())
           };
            rule.ValidationParameters["inputstring"] = InputString;

            yield return rule;
        }
        public override bool IsValid(object value)
        {
            if (value == null)
                return true;
            string inputString = (string)value;
            if (inputString.Contains(InputString))
            {
                return false;
            }
            return true;
        }
    }

  public class TestModel
    {
        [Required]
        [Display(Name = "用戶名")]
        public string UserName { get; set; }

        [Required]
        [DataType(DataType.Password)]
        [Display(Name = "密碼")]
        public string Password { get; set; }

        [Display(Name = "愛好(hao)")]
        [NotDefaultValue(InputString = "1")]/*如果用戶選擇為１，則驗(yan)證不通過*/
        public IEnumerable<SelectListItem> Liker { get; set; }
    }

    $.validator.addMethod('notdefaultvalue', function (value, element, param) {
        if (value == false) {
            return true;
        }
        if (value.indexOf(param) != -1) {
            return false;
        }
        else {
            return true;
        }
    });
    $.validator.unobtrusive.adapters.addSingleVal('notdefaultvalue', 'inputstring');