验证组件——FluentValidation

      FluentValidation

　　FluentValidation是与ASP.NET DataAnnotataion Attribute验证实体不同的数据验证组件，提供了将实体与验证分离开来的验证方式，同时FluentValidation还提供了表达式      链式语法。

地址：

https://github.com/JeremySkinner/FluentValidation

     static void Main(string[] args)
        {
            //非空验证
            TestValidator validator = new TestValidator(v => v.RuleFor(x => x.Surname).NotNull());
            var result= validator.Validate(new Person { Surname = "Foo" });//true
            Console.WriteLine(result.IsValid);
            result = validator.Validate(new Person { Surname = null});//false
            Console.WriteLine(result.IsValid);

            validator = new TestValidator {
                v => v.RuleFor(x => x.Surname).NotEmpty()
            };
             result = validator.Validate(new Person { Surname = null });
            Console.WriteLine(result.IsValid);

        }

 public class Person
    {
        public string NameField;
        public int Id { get; set; }
        public string Surname { get; set; }
        public string Forename { get; set; }

    }

源码有很多测试示例