使用SystemWebScriptSerializationJavaScriptSerializer类
SystemWebScriptSerializationJavaScriptSerializer类是NET类库中自带的一种JSON序列化实现，在NET Framework5及以后版本中可以使用这个类，这个类位于SystemWebExtensionsdll中，使用这个类是必须添加对这个dll的引用。
下面的代码是使用JavaScriptSerializer进行序列化和反序列化的例子：

复制代码 代码如下:

publicstaticvoid JavaScriptSerializerDemo()
{
User user =new User { UserId =1, UserName ="李刚", CreateDate = DateTimeNowAddYears(-30),Birthday=DateTimeNowAddYears(-50), Priority = PriorityHighest, Salary =500000 };
//JavaScriptSerializer类在SystemWebExtensionsdll中，注意添加这个引用
JavaScriptSerializer serializer =new JavaScriptSerializer();
//JSON序列化
string result=serializerSerialize(user);
ConsoleWriteLine("使用JavaScriptSerializer序列化后的结果：{0},长度：{1}", result, resultLength);
//JSON反序列化
user = serializerDeserialize(result);
ConsoleWriteLine("使用JavaScriptSerializer反序列化后的结果：UserId:{0},UserName: {1},CreateDate:{2},Priority:{3}", userUserId, userUserName, userCreateDate, userPriority);
}

说明：如果不想序列化某个字段，可以在字段前面加[JsonIgnore]标记。
使用SystemRuntimeSerializationJsonDataContractJsonSerializer类
SystemRuntimeSerializationJsonDataContractJsonSerializer类位于SystemServiceModelWebdll中，使用这个类时除了需要添加对SystemServiceModelWebdll的引用之外，还需要添加SystemRuntimeSerializationdll的引用，注意这个类也是在NET Framework5及以后版本中可以使用。
下面是使用DataContractJsonSerializer类的例子：

复制代码 代码如下:

publicstaticvoid DataContractJsonSerializerDemo()
{
User user =new User { UserId =1, UserName ="李刚", CreateDate = DateTimeNowAddYears(-30), Birthday = DateTimeNowAddYears(-50), Priority = PriorityAboveNormal, Salary =50000 };
string result =stringEmpty;
//DataContractJsonSerializer类在SystemServiceModelWebdll中，注意添加这个引用
DataContractJsonSerializer serializer =new DataContractJsonSerializer(typeof(User));
using (MemoryStream stream =new MemoryStream())
{
//JSON序列化
serializerWriteObject(stream, user);
result = EncodingUTFGetString(streamToArray());
ConsoleWriteLine("使用DataContractJsonSerializer序列化后的结果：{0},长度：{1}", result, resultLength);
}
//JSON反序列化
byte[] buffer = EncodingUTFGetBytes(result);
using (MemoryStream stream =new MemoryStream(buffer))
{
user = serializerReadObject(stream) as User;
ConsoleWriteLine("使用DataContractJsonSerializer反序列化后的结果：UserId: {0},UserName:{1},CreateDate:{2},Priority:{3}", userUserId, userUserName, userCreateDate, userPriority);
}
}

注意：要使用DataContractJsonSerializer类进行序列化和反序列化，必须给类加上[DataContract]属性，对要序列化的字段加上[DataMember]属性，如果不想序列化某个字段或者属性，可以加上[IgnoreDataMember]属性。
使用NewtonsoftJsonJsonConvert类
NewtonsoftJsonJsonConvert类是非微软提供的一个JSON序列化和反序列的开源免费的类库（下载网址是：http://wwwcodeplexcom/json/），它提供了更灵活的序列化和反序列化控制，并且如果你的开发环境使用的是NET Framework5及以后版本的话，你就可以使用Linq to JSON，这样一来面对一大段的数据不必一一解析，你可以使用Linq to JSON解析出你关心的那部分即可，非常方便。
下面是使用NewtonsoftJsonJsonConvert类的例子：

复制代码 代码如下:

publicstaticvoid JsonConvertDemo()
{
User user =new User { UserId =1, UserName ="李刚", CreateDate = DateTimeNowAddYears(-30), Birthday = DateTimeNowAddYears(-50), Priority = PriorityBelowNormal, Salary =5000 };
//JsonConvert类在NewtonsoftJsonNetdll中，注意到http://wwwcodeplexcom/json/下载这个dll并添加这个引用
//JSON序列化
string result = JsonConvertSerializeObject(user);
ConsoleWriteLine("使用JsonConvert序列化后的结果：{0},长度：{1}", result, resultLength);
//JSON反序列化
user = JsonConvertDeserializeObject(result);
ConsoleWriteLine("使用JsonConvert反序列化后的结果：UserId:{0},UserName: {1},CreateDate:{2},Priority:{3}", userUserId, userUserName, userCreateDate, userPriority);
}
publicstaticvoid JsonConvertLinqDemo()
{
User user =new User { UserId =1, UserName ="周公", CreateDate = DateTimeNowAddYears(-8), Birthday = DateTimeNowAddYears(-32), Priority = PriorityLowest, Salary =500, Urls =new List { "http://zhoufoxcnblog51ctocom", "https://www.jb51.net" } };
//JsonConvert类在NewtonsoftJsonNetdll中，注意到http://wwwcodeplexcom/json/下载这个dll并添加这个引用
//JSON序列化
string result = JsonConvertSerializeObject(user);
ConsoleWriteLine("使用JsonConvert序列化后的结果：{0},长度：{1}", result, resultLength);
//使用Linq to JSON
JObject jobject = JObjectParse(result);
JToken token = jobject["Urls"];
List urlList =new List();
foreach (JToken t in token)
{
urlListAdd(tToString());
}
ConsoleWrite("使用Linq to JSON反序列化后的结果：[");
for (int i =0; i < urlListCount -1;i++ )
{
ConsoleWrite(urlList[i] +",");
}
ConsoleWriteLine(urlList[urlListCount -1] +"]");
}

注意：如果有不需要序列化的字段，可以给该字段添加[JsonIgnore]标记。在Newtonsoft这个类库中对于日期的序列化有多种方式，可以类的DataTime成员添加上对应的标记，这样在进行序列化和反序列化时就会按照指定的方式进行，在本例中User类的CreateDate属性添加的属性是[JsonConverter(typeof(IsoDateTimeConverter))]，而Birthday属性添加的属性是[JsonConverter(typeof(JavaScriptDateTimeConverter))]，从序列化的结果可以看出来它们最终的表现形式并不一样。
本文中所有的示例代码如下：

复制代码 代码如下:

using System;
using SystemCollectionsGeneric;
using SystemLinq;
using SystemText;
using SystemWebScriptSerialization;
using SystemRuntimeSerializationJson;
using SystemIO;
using SystemRuntimeSerialization;
using NewtonsoftJson;
using NewtonsoftJsonLinq;
using NewtonsoftJsonConverters;
namespace JSONDemo
{
class Program
{
staticvoid Main(string[] args)
{
JavaScriptSerializerDemo();
DataContractJsonSerializerDemo();
JsonConvertDemo();
JsonConvertLinqDemo();
ConsoleReadLine();
}
publicstaticvoid JavaScriptSerializerDemo()
{
User user =new User { UserId =1, UserName ="李刚", CreateDate = DateTimeNowAddYears(-30),Birthday=DateTimeNowAddYears(-50), Priority = PriorityHighest, Salary =500000 };
//JavaScriptSerializer类在SystemWebExtensionsdll中，注意添加这个引用
JavaScriptSerializer serializer =new JavaScriptSerializer();
//JSON序列化
string result=serializerSerialize(user);
ConsoleWriteLine("使用JavaScriptSerializer序列化后的结果：{0},长度：{1}", result, resultLength);
//JSON反序列化
user = serializerDeserialize(result);
ConsoleWriteLine("使用JavaScriptSerializer反序列化后的结果：UserId:{0},UserName:{1},CreateDate:{2},Priority:{3}", userUserId, userUserName, userCreateDate, userPriority);
}
publicstaticvoid DataContractJsonSerializerDemo()
{
User user =new User { UserId =1, UserName ="李刚", CreateDate = DateTimeNowAddYears(-30), Birthday = DateTimeNowAddYears(-50), Priority = PriorityAboveNormal, Salary =50000 };
string result =stringEmpty;
//DataContractJsonSerializer类在SystemServiceModelWebdll中，注意添加这个引用
DataContractJsonSerializer serializer =new DataContractJsonSerializer(typeof(User));
using (MemoryStream stream =new MemoryStream())
{
//JSON序列化
serializerWriteObject(stream, user);
result = EncodingUTFGetString(streamToArray());
ConsoleWriteLine("使用DataContractJsonSerializer序列化后的结果：{0},长度：{1}", result, resultLength);
}
//JSON反序列化
byte[] buffer = EncodingUTFGetBytes(result);
using (MemoryStream stream =new MemoryStream(buffer))
{
user = serializerReadObject(stream) as User;
ConsoleWriteLine("使用DataContractJsonSerializer反序列化后的结果：UserId:{0},UserName:{1},CreateDate:{2},Priority:{3}", userUserId, userUserName, userCreateDate, userPriority);
}
}
publicstaticvoid JsonConvertDemo()
{
User user =new User { UserId =1, UserName ="李刚", CreateDate = DateTimeNowAddYears(-30), Birthday = DateTimeNowAddYears(-50), Priority = PriorityBelowNormal, Salary =5000 };
//JsonConvert类在NewtonsoftJsonNetdll中，注意到http://wwwcodeplexcom/json/下载这个dll并添加这个引用
//JSON序列化
string result = JsonConvertSerializeObject(user);
ConsoleWriteLine("使用JsonConvert序列化后的结果：{0},长度：{1}", result, resultLength);
//JSON反序列化
user = JsonConvertDeserializeObject(result);
ConsoleWriteLine("使用JsonConvert反序列化后的结果：UserId:{0},UserName:{1},CreateDate:{2},Priority:{3}", userUserId, userUserName, userCreateDate, userPriority);
}
publicstaticvoid JsonConvertLinqDemo()
{
User user =new User { UserId =1, UserName ="周公", CreateDate = DateTimeNowAddYears(-8), Birthday = DateTimeNowAddYears(-32), Priority = PriorityLowest, Salary =500, Urls =new List { "http://zhoufoxcnblog51ctocom", "https://www.jb51.net" } };
//JsonConvert类在NewtonsoftJsonNetdll中，注意到http://wwwcodeplexcom/json/下载这个dll并添加这个引用
//JSON序列化
string result = JsonConvertSerializeObject(user);
ConsoleWriteLine("使用JsonConvert序列化后的结果：{0},长度：{1}", result, resultLength);
//使用Linq to JSON
JObject jobject = JObjectParse(result);
JToken token = jobject["Urls"];
List urlList =new List();
foreach (JToken t in token)
{
urlListAdd(tToString());
}
ConsoleWrite("使用Linq to JSON反序列化后的结果：[");
for (int i =0; i < urlListCount -1;i++ )
{
ConsoleWrite(urlList[i] +",");
}
ConsoleWriteLine(urlList[urlListCount -1] +"]");
}
}
[DataContract]
publicclass User
{
///