.Net 之 Newtonsoft.Json

来源： http://www.cnblogs.com/mejozn/archive/2013/05/05/3060479.html

Json.NET（Newtonsoft.Json）是.Net 框架下比较流行的一款高效json序列化开源组件，支持.Net Framework 2.0 到 4.5+，并且可用于.Net各种环境Asp.net，Silverlight，Windows Phone，Windows 8等等。http://json.codeplex.com/

性能

Json.NET、DataContractJsonSerializer、JavascriptSeriallizer性能测试结果对比，还不错吧。

引用

方式1：下载解压引用Newtonsoft.Json.dll 下载地址 http://json.codeplex.com/releases/view/105633

方式2：Nuget安装 PM> Install-Package Newtonsoft.Json

序列化与反序列

1. 基本用法 首先引用Newtonsoft.Json命名空间,定义好与json同结构的的类用于转换

Software software = new  Software{ SoftID=1,
                SoftName="限时免费" ,
                DownloadUrl="http://itunes.apple.com/cn/app/id427577372?mt=8",
                ReleaseTime=DateTime.Now
            };

//序列化string jsonStr = JsonConvert.SerializeObject(software);

//反序列化
Software objSoftware =JsonConvert.DeserializeObject<Software>(jsonStr);
Console.WriteLine(jsonStr);

序列化输出

2. 时间格式处理 DateTime类型序列化默认序列化如上，这种格式在其它客户端很难读取，或者想按自己的格式化

Newtonsoft.Json.Converters.IsoDateTimeConverter timeConverter = new Newtonsoft.Json.Converters.IsoDateTimeConverter();
timeConverter.DateTimeFormat = "yyyy年MM月dd日 HH:mm:ss";
Console.WriteLine(JsonConvert.SerializeObject(software, timeConverter));

输出结果：

3. 匿名类型序列化 这种方法无需事先定义与json同结构的类就能反序列化

//Json字符串string jsonStr = @"{result:-1,desc:‘参数错误，请检查格式‘}";

 //反序列化var obj = JsonConvert.DeserializeAnonymousType(jsonStr, new { result = 0, desc = string.Empty });
 Console.WriteLine(string.Format("result:{0} desc:{1}", obj.result, obj.desc));

4. 快速定位节点 用于快速处理或者json结构较为复杂的字符串，又不想定义对应转移类，如

{"weatherinfo":{"city":"福州","city_en":"fuzhou","date_y":"2013年5月4日","date":"","week":"星期六","fchh":"18","cityid":"101230101","temp1":"16℃~21℃","temp2":"16℃~23℃","temp3":"17℃~24℃","temp4":"16℃~26℃","temp5":"17℃~29℃","temp6":"18℃~28℃","tempF1":"60.8℉~69.8℉","tempF2":"60.8℉~73.4℉","tempF3":"62.6℉~75.2℉","tempF4":"60.8℉~78.8℉","tempF5":"62.6℉~84.2℉","tempF6":"64.4℉~82.4℉","weather1":"阵雨","weather2":"阵雨转阴","weather3":"阴转雷阵雨","weather4":"阵雨转雷阵雨","weather5":"阵雨转多云","weather6":"多云转中雨","img1":"3","img2":"99","img3":"3","img4":"2","img5":"2","img6":"4","img7":"3","img8":"4","img9":"3","img10":"1","img11":"1","img12":"8","img_single":"3","img_title1":"阵雨","img_title2":"阵雨","img_title3":"阵雨","img_title4":"阴","img_title5":"阴","img_title6":"雷阵雨","img_title7":"阵雨","img_title8":"雷阵雨","img_title9":"阵雨","img_title10":"多云","img_title11":"多云","img_title12":"中雨","img_title_single":"阵雨","wind1":"微风","wind2":"微风","wind3":"微风","wind4":"微风","wind5":"微风","wind6":"微风","fx1":"微风","fx2":"微风","fl1":"小于3级","fl2":"小于3级","fl3":"小于3级","fl4":"小于3级","fl5":"小于3级","fl6":"小于3级","index":"舒适","index_d":"建议着薄型套装或牛仔衫裤等春秋过渡装。年老体弱者宜着套装、夹克衫等。","index48":"舒适","index48_d":"建议着薄型套装或牛仔衫裤等春秋过渡装。年老体弱者宜着套装、夹克衫等。","index_uv":"弱","index48_uv":"最弱","index_xc":"不宜","index_tr":"适宜","index_co":"舒适","st1":"19","st2":"14","st3":"25","st4":"14","st5":"23","st6":"16","index_cl":"较不宜","index_ls":"不太适宜","index_ag":"易发"}}

读取weatherinfo下的weather1

 var obj = JObject.Parse(html);
 string weather1 = (string)obj["weatherinfo"]["weather1"];