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

關于JSON的入門介紹見(首頁的圖很形象)：

http://www.json.org/?

一、Using

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

usingSystem.Runtime.Serialization.Json;usingSystem.Runtime.Serialization;

?二、定義序列化的類

假如我們要轉化的JSON字符串格式為：

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

然后編寫相應的序列化的類，注意下面類加的Attribute：

[DataContract(Namespace?=?"http://coderzh.cnblogs.com")]class?Config
{
????[DataMember(Order?=?0)]public?string?encoding?{?get;?set;?}
????[DataMember(Order?=?1)]public?string[]?plugins?{?get;?set;?}
????[DataMember(Order?=?2)]public?Indent?indent?{?get;?set;?}
}
[DataContract(Namespace?=?"http://coderzh.cnblogs.com")]class?Indent
{
????[DataMember(Order?=?0)]public?int?length?{?get;?set;?}
????[DataMember(Order?=?1)]public?bool?use_space?{?get;?set;?}
}

三、對象轉化為JSON字符串

使用WriteObject方法：

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字符串轉對象

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);

?五、輸出結果：

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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