.net3.5提供了json对象序列化与反序列化的类。位置在：System.Runtime.Serialization.Json空间下。其中如果要应用这个空间还必须添加对
System.ServiceModel
System.ServiceModel.Web
这两个库文件的引用。
参考实体类：Customer
public
class
Customer
{
public int Unid { get ; set ; }
public string CustomerName { get ; set ; }
}
{
public int Unid { get ; set ; }
public string CustomerName { get ; set ; }
}
DataContractJsonSerializer
将对象序列化为 JavaScript 对象表示法 (JSON)，并将 JSON 数据反序列化为对象。无法继承此类。
其中有个方法WriteObject，它的功能定义为：将对象序列化为 JavaScript 对象表示法 (JSON) 文档
它有三个方法重载，其中一个为：
public
override
void
WriteObject(Stream stream,Object graph)
它的功能描述这：将指定对象序列化为 JavaScript 对象表示法 (JSON) 数据，并将生成的 JSON 写入流中
（一）序列化
public
string
ToJson(Customer customer)
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (Customer));
MemoryStream ms = new MemoryStream();
ds.WriteObject(ms, customer);
string strReturn = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return strReturn;
}
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (Customer));
MemoryStream ms = new MemoryStream();
ds.WriteObject(ms, customer);
string strReturn = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return strReturn;
}
创建类实例，通过它的WriteObject方法来向流写入序列化的对象，再把流写入到字符串中。就可以得到JSON对象。
测试一下：
Customer cc
=
new
Customer {Unid
=
1
,CustomerName
=
"
John
"
};
string strJson = ToJson(cc);
Console.WriteLine(strJson);
string strJson = ToJson(cc);
Console.WriteLine(strJson);
结果为：{"CustomerName":"John","Unid":1}
（二）反序列化
ReadObject方法，其描述为：反序列化 JSON（JavaScript 对象表示法）数据，并返回反序列化的对象。
它有很多重载，现在通过一种：
public override Object ReadObject(Stream stream)
它从流中得到反序列化的对象。
public
object
FromJson(
string
strJson)
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (Customer));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson));
return ds.ReadObject(ms);
}
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (Customer));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson));
return ds.ReadObject(ms);
}
测试：
string
strJson
=
"
{\
"
CustomerName\
"
:\
"
John\
"
,\
"
Unid\
"
:1}
"
;
Customer c = FromJson(strJson) as Customer;
Console.WriteLine(c.Unid + " " + c.CustomerName);
Customer c = FromJson(strJson) as Customer;
Console.WriteLine(c.Unid + " " + c.CustomerName);
（三）通过泛型方法对两者进行修改
为了适应多类型实例的序列化与反序列化，通过泛型方法来实现。
public
string
ToJson
<
T
>
(T t)
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (T));
MemoryStream ms = new MemoryStream();
ds.WriteObject(ms, t);
string strReturn = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return strReturn;
}
public T FromJson < T > ( string strJson) where T: class
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (T));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson));
return ds.ReadObject(ms) as T;
}
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (T));
MemoryStream ms = new MemoryStream();
ds.WriteObject(ms, t);
string strReturn = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return strReturn;
}
public T FromJson < T > ( string strJson) where T: class
{
DataContractJsonSerializer ds = new DataContractJsonSerializer( typeof (T));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson));
return ds.ReadObject(ms) as T;
}
· 反序列化时通过泛型约束来指定类型 T 为类类型。
测试：
Customer cc
=
new
Customer {Unid
=
1
,CustomerName
=
"
John
"
};
string strJsons = ToJson < Customer > (cc);
Console.WriteLine(strJsons);
string strJson = " {\ " CustomerName\ " :\ " John\ " ,\ " Unid\ " :1} " ;
Customer c = FromJson < Customer > (strJson);
Console.WriteLine(c.Unid + " " + c.CustomerName);
string strJsons = ToJson < Customer > (cc);
Console.WriteLine(strJsons);
string strJson = " {\ " CustomerName\ " :\ " John\ " ,\ " Unid\ " :1} " ;
Customer c = FromJson < Customer > (strJson);
Console.WriteLine(c.Unid + " " + c.CustomerName);
