[Required(ErrorMessage = @"地址 1 为必填项！")]
 [StringLength(99, ErrorMessage = @"地址 1 不能超过99个字符")]
 public string Address1 { get; set; }

           
            var model = new ClassModel
            {
                Address1 = "",
            };

            var errors = new List<ValidationResult>();
            var context = new ValidationContext(model, null, null);
            Validator.TryValidateObject(model, context, errors, true);

            if (errors.Any())
            {
                MessageBox.Show(errors.Select(t => t.ErrorMessage).FirstOrDefault());
            }