.net mvc web api 返回 json 内容时过滤值为null的属性

1.响应内容（过滤前）

{"msg":"初始化成功！","code":"","success":true,data:null}

 

2.响应内容(过滤后)

{"msg":"初始化成功！","code":"","success":true}

using System.Net.Http.Formatting;
using System.Web.Http;

namespace xxxxxxx
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
        ......

            //默认返回 json
            GlobalConfiguration.Configuration.Formatters
                .JsonFormatter.MediaTypeMappings.Add(
                new QueryStringMapping("datatype", "json", "application/json"));
            //返回格式选择
            GlobalConfiguration.Configuration.Formatters
                .XmlFormatter.MediaTypeMappings.Add(
                new QueryStringMapping("datatype", "xml", "application/xml"));
            //json 序列化设置
            GlobalConfiguration.Configuration.Formatters
                .JsonFormatter.SerializerSettings = new Newtonsoft.Json.JsonSerializerSettings()
                {
                    NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore //设置忽略值为 null 的属性
                };
        }
    }
}