我想要使序列化出来的JSON都是小写，可以通过建立 LowercaseContractResolver：DefaultContractResolver

来实现， 创建Custom ContractResolver可以对很多东西进行更改，可以自定义规则。。。 如果你只要针对某个的话，可以用 JsonProperty 或者使用CustomJsonConverter: JsonConverter。。

改变规则：

http://stackoverflow.com/questions/6288660/net-ensuring-json-keys-are-lowercase

http://stackoverflow.com/questions/12501805/how-to-set-json-net-contractserializer-for-a-certain-specific-type-instead-of-gl

http://stackoverflow.com/questions/25183710/serialize-json-property-name

CustomJsonConverter:

http://blog.maskalik.com/asp-net/json-net-implement-custom-serialization/

DATE TIME: http://cgeers.com/2011/09/25/writing-a-custom-json-net-datetime-converter/

You can create a custom contract resolver for this. The following contract resolver will convert all keys to lowercase:

public class LowercaseContractResolver : DefaultContractResolver{    protected override string ResolvePropertyName(string propertyName)    {        return propertyName.ToLower();    }}

Usage:

var settings = new JsonSerializerSettings();settings.ContractResolver = new LowercaseContractResolver();var json = JsonConvert.SerializeObject(authority, Formatting.Indented, settings);

Wil result in:

{"username":"Mark","apitoken":"xyzABC1234"}

If you always want to serialize using the LowercaseContractResolver, consider wrapping it in a class to avoid repeating yourself:

public class LowercaseJsonSerializer{    private static readonly JsonSerializerSettings Settings = new JsonSerializerSettings    {        ContractResolver = new LowercaseContractResolver()    };    public static string SerializeObject(object o)    {        return JsonConvert.SerializeObject(o, Formatting.Indented, Settings);    }    public class LowercaseContractResolver : DefaultContractResolver    {        protected override string ResolvePropertyName(string propertyName)        {            return propertyName.ToLower();        }    }}

Which can be used like this:

var json = LowercaseJsonSerializer.SerializeObject(new { Foo = "bar" });// { "foo": "bar" }

ASP.NET MVC4 / WebAPI

If you are using ASP.NET MVC4 / WebAPI, you can use a CamelCasePropertyNamesContractResolverfrom Newtonsoft.Json library which included by default.

如何更改Json.NET的序列化规则