两种转换方式：

1.全局设定，针对GlobalConfiguration.Configuration.Formatters.JsonFormatter做设定，位于Global.asax 如：

var json = GlobalConfiguration.Configuration.Formatters.JsonFormatter;json.SerializerSettings.Formatting = Newtonsoft.Json.Formatting.Indented;json.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();json.SerializerSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;json.SerializerSettings.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.MicrosoftDateFormat;json.SerializerSettings.DateTimeZoneHandling = Newtonsoft.Json.DateTimeZoneHandling.Utc;json.SerializerSettings.Culture = new CultureInfo("it-IT");

2.单独设定，针对单独Action 代码段如：

var formatter = new JsonMediaTypeFormatter();var json = formatter.SerializerSettings;json.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.MicrosoftDateFormat;json.DateTimeZoneHandling = Newtonsoft.Json.DateTimeZoneHandling.Utc;json.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;json.Formatting = Newtonsoft.Json.Formatting.Indented;json.ContractResolver = new CamelCasePropertyNamesContractResolver();json.Culture = new CultureInfo("it-IT");return Request.CreateResponse(HttpStatusCode.OK, result, formatter);

参考来源：http://tostring.it/2012/07/18/customize-json-result-in-web-api/

这篇文章既然看懂了，看来英文也不是不能学会！加油！