web api model 自定义验证

    public class DescompareValidationAt : ValidationAttribute
    {

        public override bool IsValid(object value)
        {
            if (DES.CanDescheck((string)(value)) == true)
            {
                return true;
            }
            return false;
        }
    }

public class accountpointrequest : BaseRequestModel
    {
        [Display(Name = "会员编号")]
        [DescompareValidationAt(ErrorMessage = "会员编号不符合规范")]
        public string customer_id { get; set; }
    }

protected bool ModelVerification()
        {
            if (ModelState.IsValid)
            {
                return true;
            }
            else
            {
                
                return false;
            }
           
        }

        protected string ValidateFailMessage()
        {
            string VerificaError = null;
            var ErrorCollection = ActionContext.ModelState;
            var keylist = ErrorCollection.Keys.ToList();
            var keyvalues = ErrorCollection.Values.ToList();
            var Valueslist = keyvalues.ToList();
            for (var i = 0; i < Valueslist.Count; i++)
            {
                for (var j = 0; j < Valueslist[i].Errors.Count; j++)
                {
                    string TempString = null;
                    TempString = Valueslist[i].Errors[j].ErrorMessage.ToString2();
                    if (TempString != "")
                    {
                        VerificaError = VerificaError + Valueslist[i].Errors[j].ErrorMessage + ";";
                    }
                }
            }
            if (VerificaError == null)
            {
                VerificaError = Common.StatusCode.SYSTEM_EXCEPTION.Description;
            }
            return VerificaError;
        }