c#解析json
json是一种通用的文本序列，有其固定的格式。 json的使用前必须转化为实体类。转化方法是在线转换。网址：http://www.bejson.com/convert/json2csharp/
一，格式1及实体类
{"message":"ok","nu":"367847964498","ischeck":"1","condition":"F00","com":"shunfeng","status":"200","state":"3","data":[{"time":"2017-09-21 09:33:09","ftime":"2017-09-21 09:33:09","context":"已签收,感谢使用顺丰,期待再次为您服务","location":""},{"time":"2017-09-21 09:09:48","ftime":"2017-09-21 09:09:48","context":"快件交给巩向涛，正在派送途中（联系电话：18806439871）","location":""},{"time":"2017-09-21 07:02:41","ftime":"2017-09-21 07:02:41","context":"快件到达 【淄博市桓台田庄速运营业点 】","location":""},{"time":"2017-09-20 15:32:00","ftime":"2017-09-20 15:32:00","context":"快件在【淄博市桓台县工业街营业点】已装车，准备发往下一站","location":""},{"time":"2017-09-20 13:37:08","ftime":"2017-09-20 13:37:08","context":"快件到达 【淄博市桓台县工业街营业点】","location":""},{"time":"2017-09-20 10:47:07","ftime":"2017-09-20 10:47:07","context":"快件在【淄博高新集散中心】已装车，准备发往下一站","location":""},{"time":"2017-09-20 10:15:47","ftime":"2017-09-20 10:15:47","context":"快件到达 【淄博高新集散中心】","location":""},{"time":"2017-09-19 23:20:18","ftime":"2017-09-19 23:20:18","context":"快件在【深圳总集散中心】已装车，准备发往下一站","location":""},{"time":"2017-09-19 22:39:27","ftime":"2017-09-19 22:39:27","context":"快件到达 【深圳总集散中心】","location":""},{"time":"2017-09-19 18:57:33","ftime":"2017-09-19 18:57:33","context":"快件在【深圳龙华新区华联社区营业部】已装车，准备发往下一站","location":""},{"time":"2017-09-19 16:12:21","ftime":"2017-09-19 16:12:21","context":"顺丰速运 已收取快件","location":""}]}
特征：
1，由大括号{}首尾包围
2，包含两大部分，第一部分为头部，有一些属性值。第二部分是正文，命名为data，由中括号[]包围。
转化为实体类：
public class DataItem{ /// /// /// public string time { get; set; }
/// /// /// public string ftime { get; set; }
/// /// 已签收,感谢使用顺丰,期待再次为您服务 /// public string context { get; set; }
/// /// /// public string location { get; set; }
}
public class Root{ /// /// /// public string message { get; set; }
/// /// /// public string nu { get; set; }
/// /// /// public string ischeck { get; set; }
/// /// /// public string condition { get; set; }
/// /// /// public string com { get; set; }
/// /// /// public string status { get; set; }
/// /// /// public string state { get; set; }
/// /// /// public List data { get; set; }
}
特征：
1，头部类：Root，结尾处定义了其表示方法：data
2，主体类，从json中提取
二、格式2及实体类
{"log_id": 6822962530653775861, "words_result_num": 2, "words_result": [{"location": {"width": 317, "top": 32, "left": 0, "height": 43}, "words": "第一部分"}, {"location": {"width": 318, "top": 193, "left": 0, "height": 45}, "words": "第二部分"}]}
除具备格式1的特征外，发现主体部分命名为words_result_num，有两个值分别是location和words，其第一个值又是一个新的集合。
public class Location{ /// /// /// public int width { get; set; }
/// /// /// public int top { get; set; }
/// /// /// public int left { get; set; }
/// /// /// public int height { get; set; }
}
public class Words_resultItem{ /// /// /// public Location location { get; set; }
/// /// 第一部分 /// public string words { get; set; }
}
public class Root{ /// /// /// public int log_id { get; set; }
/// /// /// public int words_result_num { get; set; }
/// /// /// public List words_result { get; set; }
}
发现，分成三个类。
二、添加一个类文件
在项目中添加一个类json1，使用转换后的实体类，替换了：
class Json1
{
}
这时，无需引用，这个类文件即可被主程序调用。
三、声明dll
下载 Newtonsoft.Json.dll，并声明
using Newtonsoft.Json;
四、使用
格式1示例：
Root rt = JsonConvert.DeserializeObject<Root>(JsonTxt);
MessageBox.Show("com=" + rt.com + "\r\n" + "condition=" + rt.condition + "\r\n" + "ischeck=" + rt.ischeck + "\r\n" + "state=" + rt.state + "\r\n" + "status=" + rt.status);
for (int i = 0; i < rt.data.Count; i++)
{
MessageBox.Show("Data=" + rt.data[i].context + "\r\n" + rt.data[i].location + "\r\n" + rt.data[i].time + "\r\n" + rt.data[i].ftime);
}
格式2示例：
Root rt = JsonConvert.DeserializeObject<Root>(getJsontxt);
for (int i = 0; i < rt.words_result.Count; i++)
{
MessageBox.Show("Data=" + rt.words_result[i].words + "\r\n"+ rt.words_result[i].location.top);
}
需要说明的是，示例2会报int32越界的错误，因为有一个整数型的值太大了，需要提前处理，将数值改小即可。
