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:

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

[DataContract(Namespace 
= "http://coderzh.cnblogs.com")]
class Indent
{
    [DataMember(Order 
= 0)]
    
public int length { getset; }
    [DataMember(Order 
= 1)]
    
public bool use_space { getset; }
}

三、对象转化为JSON字符串

使用WriteObject方法:

ContractedBlock.gif ExpandedBlockStart.gif WriteObject
var config = new Config(){
                         encoding 
= "UTF-8",
                         plugins 
= new string[]{"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 = new byte[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);

四、JSON字符串转对象

使用ReadObject方法:

ContractedBlock.gif ExpandedBlockStart.gif ReadObject
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);

 五、输出结果:

JSON  string   is :
{
" 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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