gistfile1.cs

// 要加入參考system.componentmodel.dataannotations.dll
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace ModelValidate
{
    class Program
    {
        static void Main(string[] args)
        {
            var person = new Person
            {
                Id = 238,
                Name = "kevin tan",
                Birthday = new DateTime(2011, 1, 1)
            };

            ICollection<ValidationResult> results = new List<ValidationResult>();

            var isValid = DataAnnotationsValidator.TryValidate(person, out results);

            if (!isValid)
            {
                foreach (var validationResult in results)
                {
                    foreach (var memberName in validationResult.MemberNames)
                    {
                        var value = person.GetType().GetProperty(memberName).GetValue(person, null);
                        Console.WriteLine("name:{0}, value:{1}, error message:{2}", memberName, value, validationResult.ErrorMessage);
                        Console.WriteLine();
                    }
                }
            }
            else
            {
                Console.WriteLine("validate success");
            }
        }
    }

    public class Person
    {
        [Range(10, 1000)]
        [RegularExpression(@"^2+?8$")]
        public int Id { get; set; }

        [Required(AllowEmptyStrings = false)]
        [StringLength(6, MinimumLength = 3)]
        public string Name { get; set; }

        [Required]
        [Range(typeof(DateTime), "2012/04/19", "2012/05/01")]
        public DateTime? Birthday { get; set; }
    }

    public class DataAnnotationsValidator
    {
        public static bool TryValidate(object entity, out ICollection<ValidationResult> results)
        {
            var context = new ValidationContext(entity, serviceProvider: null, items: null);

            results = new List<ValidationResult>();

            return Validator.TryValidateObject(
                entity, context, results,
                validateAllProperties: true
            );
        }
    }
}