Json.Net 学习笔记(二) Linq to Json

using Newtonsoft.Json.Linq;

定义类：

public class Product
{
public string Name { get; set; }
public DateTime Expiry { get; set; }
public decimal Price { get; set; }
public string[] Sizes { get; set; }
}

测试:

Product product = new Product
{
Name = "Apple",
Expiry = new DateTime(2010, 12, 18),
Price = 3.99M,
Sizes = new string[] { "Small", "Medium", "Large" }
};

string serializedJson = JsonConvert.SerializeObject(product);

JObject o = JObject.Parse(serializedJson);
string name = (string)o["Name"];
//Apple
JArray sizes = (JArray)o["Sizes"];
string smallest = (string)sizes[0];
Response.Write(name + "," + smallest + "<br/>");//输出Small
//SelectToken
smallest = (string)o.SelectToken("Sizes[0]");
Response.Write(smallest + "<br/>");//输出Small
//SelectToken with Linq
var sizeLen5 = o["Sizes"].Select(i => (string)i).Where(i => i.Length == 5).ToList<string>();
foreach (var size in sizeLen5)
{
Response.Write((string)size+ " <br/>");
};//输出Small和Large

注:JArray表示一个Json集合，JObject表示一个Json对象。