1.解析json & array
(1)json解析
using Newtonsoft.Json.Linq;
string json = @"{CPU: 'Intel',
Drives: [
'DVD read/writer',
'500 gigabyte hard drive']}";
JObject o = JObject.Parse(json);
Console.WriteLine(o.GetType());
Console.WriteLine(o.ToString());
Console.WriteLine(o["CPU"]);
Console.WriteLine(o["Drives"]);
Console.ReadKey();
Newtonsoft.Json.Linq.JObject
{
"CPU": "Intel",
"Drives": [
"DVD read/writer",
"500 gigabyte hard drive"
]
}
Intel
[
"DVD read/writer",
"500 gigabyte hard drive"
]
(2)array解析
using Newtonsoft.Json.Linq;
string json = @"['Small','Medium','Large']";
JArray a = JArray.Parse(json);
Console.WriteLine(a.GetType());
Console.WriteLine(a.ToString());
Console.WriteLine(a.Count());
Console.ReadKey();
Newtonsoft.Json.Linq.JArray
[
"Small",
"Medium",
"Large"
]
3
(3)从文件中读取json
![C#---第22:Newtonsoft中json/array的解析、创建、SelectToken(获取指定values)方法_第1张图片](http://img.e-com-net.com/image/info8/54ab317c419d4403aa4d7e69cb9f57d7.jpg)
#Progress.cs
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
namespace Progress
{
public class Progress
{
public static void Main()
{
var jo = OpenJsonFile();
var driver = jo["Drives"][1];
Console.WriteLine($"------->{driver}");
Console.ReadKey();
}
public static JObject OpenJsonFile()
{
string fileName = @"C:\Users\XXX\repos\JsonStudyDeom\JsonFiles\FirstJsonFile.json";
StreamReader file = File.OpenText(fileName);
JsonTextReader reader = new JsonTextReader(file);
JObject jsonObject = (JObject)JToken.ReadFrom(reader);
return jsonObject;
}
}
}
# ------->500 gigabyte hard drive
# another demo for parse json file
using (StreamReader reader = File.OpenText(@"c:\person.json"))
{
JObject o = (JObject)JToken.ReadFrom(new JsonTextReader(reader));
}
2.json/Aarray 的创建
(1) array 的创建
using Newtonsoft.Json.Linq;
namespace Progress
{
public class Progress
{
public static void Main()
{
JArray array = new JArray();
JValue text = new JValue("Manual text");
JValue date = new JValue(new DateTime(2000, 5, 23));
array.Add(text);
array.Add(date);
array.Add(123);
array.Add("lastItem");
Console.WriteLine(array.ToString());
Console.WriteLine(array.Count());
Console.WriteLine(array[1]);
Console.ReadKey();
}
}
}
[
"Manual text",
"2000-05-23T00:00:00",
123,
"lastItem"
]
4
2000/5/23 0:00:00
(2) json 的创建
using Newtonsoft.Json.Linq;
namespace Progress
{
public class Progress
{
public static void Main()
{
JObject o = JObject.FromObject(new
{
channel = new
{
title = "James Newton-King",
link = "http://james.newtonking.com",
description = "James Newton-King's blog.",
}
});
Console.WriteLine(o.ToString());
Console.ReadKey();
}
}
}
{
"channel": {
"title": "James Newton-King",
"link": "http://james.newtonking.com",
"description": "James Newton-King's blog."
}
}
3.SelectToken 获取json中指定的value/values
(1) SelectToken 获取json中对应的值
JObject o = JObject.Parse(@"{
'Stores': [
'Lambton Quay',
'Willis Street'
],
'Manufacturers': [
{
'Name': 'Acme Co',
'Products': [
{
'Name': 'Anvil',
'Price': 50
}
]
},
{
'Name': 'Contoso',
'Products': [
{
'Name': 'Elbow Grease',
'Price': 99.95
},
{
'Name': 'Headlight Fluid',
'Price': 4
}
]
}
]
}");
string name = (string)o.SelectToken("Manufacturers[0].Name");
decimal productPrice = (decimal)o.SelectToken("Manufacturers[0].Products[0].Price");
string productName = (string)o.SelectToken("Manufacturers[1].Products[0].Name");
(2) SelectToken with JsonPath
JObject o = JObject.Parse(@"{
'Stores': [
'Lambton Quay',
'Willis Street'
],
'Manufacturers': [
{
'Name': 'Acme Co',
'Products': [
{
'Name': 'Anvil',
'Price': 50
}
]
},
{
'Name': 'Contoso',
'Products': [
{
'Name': 'Elbow Grease',
'Price': 99.95
},
{
'Name': 'Headlight Fluid',
'Price': 4
}
]
}
]
}");
JToken acme = o.SelectToken("$.Manufacturers[?(@.Name == 'Acme Co')]");
Console.WriteLine(acme);
IEnumerable<JToken> pricyProducts = o.SelectTokens("$..Products[?(@.Price >= 50)].Name");
foreach (JToken item in pricyProducts)
{
Console.WriteLine(item);
}
# another demo
# 获取pins节点下,dataType=="Group"的字典,最终获取的字段为该字典中data.imageData.fill节点的value
$.pins.[?(@.dataType=='Group')].data.imageData.fill
![C#---第22:Newtonsoft中json/array的解析、创建、SelectToken(获取指定values)方法_第2张图片](http://img.e-com-net.com/image/info8/e5225893242a4f5d917dd7743ea1014c.jpg)
(3) SelectToken with LINQ
IList<string> storeNames = o.SelectToken("Stores").Select(s => (string)s).ToList();
IList<string> firstProductNames = o["Manufacturers"].Select(m => (string)m.SelectToken("Products[1].Name")).ToList();
decimal totalPrice = o["Manufacturers"].Sum(m => (decimal)m.SelectToken("Products[0].Price"));