IContractResolver接口提供了一种方法去定制序列化器如何去序列化和反序列化.Net对象为Json对象

实现IContractResolver接口，然后为Json序列化器分配一个实例对象，这样你就可以控制对象是否被序列化为Json对象或者Json数组、对象的成员应该被序列化成什么、如何被序列化、及他们被谁调用等。

->DefaultContractResolver

   DefaultContractResolver是序列化器默认的解析器，它以虚函数的形式提供了很多扩展功能，可以被覆写(overriden).

->CamelCasePropertyNamesContractResolver

   CamelCasePropertyNamesContractResolver继承自DefaultContractResolver，并且简单的覆写了Json属性名为camel命名规则的形式(首字母小写)

  public class Product
    {
        public string Name { get; set; }
        public decimal Price { get; set; }
        public DateTime ExpiryDate { get; set; }
        public string[] Sizes { get; set; }

    }

测试：

 Product product = new Product
            {
                ExpiryDate = new DateTime(2010, 12, 20, 18, 1, 0, DateTimeKind.Utc),
                Name = "Widget",
                Price = 9.99m,
                Sizes = new[] { "Small", "Medium", "Large" }
            };
            string json = JsonConvert.SerializeObject(
                            product,
                            Formatting.Indented,
                            new JsonSerializerSettings { ContractResolver = new CamelCasePropertyNamesContractResolver() }
                             );
            Console.WriteLine(json);

输出结果:

{
  "name": "Widget",
  "price": 9.99,
  "expiryDate": "\/Date(1292868060000)\/",
  "sizes": [
    "Small",
    "Medium",
    "Large"
  ]