C#实体对象序列化成Json，格式化，并让字段的首字母小写

public class UserInfo
{
    [JsonProperty("id")]
    public int Id{ set; get; }
    [JsonProperty("userName")]
    public string UserName{ set; get; }
}

 var user = new { Name = "john", Age = 19 }; 
 var serializerSettings = new JsonSerializerSettings
            {
                // 设置为驼峰命名
                ContractResolver = new CamelCasePropertyNamesContractResolver()
            };
var userStr = JsonConvert.SerializeObject(user, Formatting.None, serializerSettings);

protected void Application_Start()
        {
            GlobalConfiguration.Configure(WebApiConfig.Register);
            ////配置返回的时间类型数据格式  
            //GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.Converters.Add(
            //    new Newtonsoft.Json.Converters.IsoDateTimeConverter()
            //    {
            //        DateTimeFormat = "yyyy-MM-dd hh:mm:ss"
            //    });
        }