C# 中使用JSON - DataContractJsonSerializer

C#中使用JSON不需要使用第三方库，使用.NET Framwork3.5自带的System.Runtime.Serialization.Json即可很好的完成JSON的解析。

关于JSON的入门介绍见(首页的图很形象)：

http://www.json.org/

一、Using

需要添加引用：System.ServiceModel.Web 和 System.Runtime.Serialization，然后使用Using：

using System.Runtime.Serialization.Json;
using System.Runtime.Serialization;

 

二、定义序列化的类

假如我们要转化的JSON字符串格式为：

{
     "encoding":"UTF-8",
     "plug-ins":["python","c++","ruby"],
     "indent":
     {
         "length":3,
         "use_space":true
     }
}

然后编写相应的序列化的类，注意下面类加的Attribute：

JSON Object[DataContract(Namespace ="http://coderzh.cnblogs.com")]
class Config
 {
     [DataMember(Order =0)]
     publicstring encoding { get; set; }
     [DataMember(Order =1)]
     publicstring[] plugins { get; set; }
     [DataMember(Order =2)]
     public Indent indent { get; set; }
 }

[DataContract(Namespace ="http://coderzh.cnblogs.com")]
 class Indent
 {
     [DataMember(Order =0)]
     publicint length { get; set; }
     [DataMember(Order =1)]
     publicbool use_space { get; set; }
 }

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三、对象转化为JSON字符串

 使用WriteObject方法：

WriteObject var config =new Config(){
                          encoding ="UTF-8",
                          plugins =newstring[]{"python", "C++", "C#"}, 
                         indent =new Indent(){ length =4, use_space =false}
                          };

 var serializer =new DataContractJsonSerializer(typeof(Config));
 var stream =new MemoryStream();
 serializer.WriteObject(stream, config);
 byte[] dataBytes =newbyte[stream.Length];
 stream.Position =0;
 stream.Read(dataBytes, 0, (int)stream.Length);
 string dataString = Encoding.UTF8.GetString(dataBytes);
 Console.WriteLine("JSON string is:");
 Console.WriteLine(dataString);

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四、JSON字符串转对象

使用ReadObject方法：

var mStream =new MemoryStream(Encoding.Default.GetBytes(dataString));

 Config readConfig = (Config)serializer.ReadObject(mStream);

Console.WriteLine("Encoding is: {0}", readConfig.encoding);

 foreach (string plugin in readConfig.plugins)
 {
     Console.WriteLine("plugins is: {0}", plugin);
 }

 Console.WriteLine("indent.length is: {0}", readConfig.indent.length); 

Console.WriteLine("indent.use_space is: {0}",  readConfig.indent.use_space);

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五、输出结果：

JSON stringis: {"encoding":"UTF-8","plugins":["python","C++","C#"],"indent":{"length":4,"use_space":false}}

 Encoding is: UTF-8
 plugins is: python
 plugins is: C++
 plugins is: C#
 indent.length is: 4
 indent.use_space is: False

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