Java和C#下的参数验证方法

public bool Register(string name, int age)
{
 if (string.IsNullOrEmpty(name))
 {
  throw new ArgumentException("name should not be empty", "name");
 }
 if (age < 10 || age > 70)
 {
  throw new ArgumentException("the age must between 10 and 70","age");
 }
 //...
}

import com.google.common.base.Preconditions;

public static void checkPersonInfo(int age, String name){
  Preconditions.checkNotNull(name, "name为null");
  Preconditions.checkArgument(name.length() > 0, "name的长度要大于0");
  Preconditions.checkArgument(age > 0, "age必须大于0");
  System.out.println("a person age: " + age + ", name: " + name);
 }
 
 public static void getPostCode(String code){
  Preconditions.checkArgument(checkPostCode(code),"邮政编码不符合要求");
  System.out.println(code);
 }

 public static void main(String[] args) {
  try {
   checkPersonInfo(10,"fdsfsd");
   checkPersonInfo(10,null);
   checkPersonInfo(-10,"fdsfsd");
   getPostCode("012234");
   
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

public class Person
 {
  public string Name { set; get; }

  public int Age { set; get; }

  public Person(string name, int age)
  {
   Name = name;
   Age = age;
  }
 }

public class PersonValidator : AbstractValidator<Person>
 {
  public PersonValidator()
  {
   RuleFor(x => x.Name).NotEmpty().WithMessage("姓名不能为空");
   RuleFor(x => x.Name).Length(1,50).WithMessage("姓名字符不能超过50");   
   RuleFor(x => x.Age).GreaterThan(0).WithMessage("年龄必须要大于0");
  }

  private bool ValidName(string name)
  {
   // custom name validating logic goes here
   return true;
  }
 }

class Program
 {
  static void Main(string[] args)
  {
   Person customer = new Person(null,-10);
   PersonValidator validator = new PersonValidator();
   ValidationResult results = validator.Validate(customer);

   bool validationSucceeded = results.IsValid;
   IList<ValidationFailure> failures = results.Errors;
   foreach (var failure in failures)
   {
    Console.WriteLine(failure.ErrorMessage);
   }

   Console.ReadKey();
  }
 }