最近在项目中需要动态解析json,但解析json的方式有很多,如何合理的解析就是我们需要考虑的问题?比如Newtonsoft.Json.Linq下提供的JToken、JObject等,Newtonsoft.Json下提供的JsonConvert。
JObject | 用于操作json对象 |
JArray | 用于操作json数组 |
JValue | 表示数组的值 |
JProperty | 表示对象中的属性,以"key/value"的形式 |
JToken | 用于存放Linq to Json查询后的结果 |
我们今天主要介绍不同解析方式适用的场景以及用法:
1、JObject
JObject用于操作对象,若用它来解析其它类型的json会报Newtonsoft.Json.JsonReaderException。
JObject jObject = new JObject(); jObject.Add(new JProperty("name", "caixukun")); jObject.Add(new JProperty("skill", new JObject(new JProperty("id", 1), new JProperty("name", "撩妹")))); Console.WriteLine(jObject.ToString());
结果:
{
"name": "caixukun",
"skill": {
"id": 1,
"name": "撩妹"
}
}
2、JArray
JArray用于操作数组,若用它来解析其它类型的json会报Newtonsoft.Json.JsonReaderException。
JArray arr = new JArray(); arr.Add(new JValue(1)); arr.Add(new JValue(2)); arr.Add(new JValue(3)); Console.WriteLine(arr.ToString());
结果:
[
1,
2,
3
]
3、JToken
string json = "{"Name" : "Jack", "Age" : 34, "Colleagues" : [{"Name" : "Tom" , "Age":44},{"Name" : "Abel","Age":29}] }"; // 获取员工名称 JObject jObject = JObject.Parse(json); var name = jObject.Value<string>("Name"); Console.WriteLine(name); // 获取员工年龄 JToken jToken = jObject.SelectToken("Age"); Console.WriteLine(jToken.ToString()); // 获取同事信息 JToken jToken1 = jObject["Colleagues"]; Console.WriteLine(jToken1.ToString()); Console.WriteLine("============================="); // 获取员工同事的所有姓名 var names = from staff in jToken1.Children() select (string)staff["Name"]; // var names = jObject.SelectToken("Colleagues").Select(p => p["Name"]).ToList(); foreach (var item in names) { Console.WriteLine(item); } Console.WriteLine("============================="); // 修改Jack的年龄 jObject["Age"] = 99; Console.WriteLine(jObject.ToString()); // 修改同事Tome的年龄 jToken1[0]["Age"] = 45; Console.WriteLine(jObject.ToString()); Console.WriteLine("============================="); // Abel离职了 jObject["Colleagues"][1].Remove(); Console.WriteLine(jObject.ToString()); // 移除Jack的同事 jObject.Remove("Colleagues"); Console.WriteLine(jObject.ToString()); Console.WriteLine("============================="); // Jack缺少部门信息 jObject["Age"].Parent.AddAfterSelf(new JProperty("Department", "总裁办")); // 来了一个新员工Jerry JObject linda = new JObject(new JProperty("Name", "Linda"), new JProperty("Age", "23")); jObject.Add(new JProperty("Colleagues", new JArray() { linda })); Console.WriteLine(jObject.ToString());