C#对JSON与对象的序列化与反序列化

JavaScriptSerializer jss = new JavaScriptSerializer();
Console.WriteLine(jss.MaxJsonLength);   //默认接受最大的长度是 2097152    这个是接受JSON字符串的最大长度，超长会有什么后果呢？试下

Person p = new Person(1, "关羽", 21);

//序列化
string json = jss.Serialize(p);
Console.WriteLine(json);    //输出 {"Id":1,"Name":"关羽","Age":21}`这就是Json格式了

//反序列化:1、Deserialize泛型写法
Person p2 = jss.Deserialize("{\"Id\":1,\"Name\":\"关羽\",\"Age\":21}");
Console.WriteLine(p2.Id + " " + p2.Name + " " + p2.Age);    //输出 1 关羽 21
//反序列化:2、Deserialize的非泛型写法
Person p3 = jss.Deserialize("{\"Id\":1,\"Name\":\"关羽\",\"Age\":21}", typeof(Person)) as Person;  //注意这个方法返回的是object类，因此要强制转换成Person类
Console.WriteLine(p3.Id + " " + p3.Name + " " + p3.Age);    //同样输出 1 关羽 21
  
//反序列化:3、将Json字符转换为Object类型 
object obj = jss.DeserializeObject("{\"Id\":1,\"Name\":\"关羽\",\"Age\":21}");   
Person p4 = jss.ConvertToType(obj);    
Console.WriteLine(p4.Name);     
Person p5 = jss.ConvertToType(obj, typeof(Person)) as Person;
Console.WriteLine(p5.Name);   
 
public class Person
{
    public Person()
    { }
    public Person(int id, string name, int age)
    {
        this.Id = id;
        this.Name = name;
        this.Age = age;
    }
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
}

void Main()
{
    DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Person));
    //最常用的两个方法
    //反序列化
    string str = "{\"Id\":1,\"Name\":\"刘备\",\"Age\":\"23\"}";
    Person p;
    using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(str)))     //构造函数能够接受Stream参数，因此你可以用内存流，文件流等等创建
    {
        p = serializer.ReadObject(ms) as Person;
    }
    Console.WriteLine(p.Name);      //输出刘备

    //反序列化
    Person p2 = new Person(2, "关羽", 23);
    byte[] byteArr;
    using (MemoryStream ms = new MemoryStream())
    {
        serializer.WriteObject(ms, p2);
        byteArr = ms.ToArray();
    }
    Console.WriteLine(Encoding.UTF8.GetString(byteArr));    //输出 {"Age":23,"Id":1,"Name":"关羽"}
}

[DataContract]      //对于使用DataContractJsonSerializer类而言，该属性是必须的
public class Person
{
    public Person(int id, string name, int age)
    {
        Id = id;
        Age = age;
        Name = name;
    }

    [DataMember] //对于使用DataContractJsonSerializer类而言，该属性是必须的
    public int Id
    {
        get;
        set;
    }
    [DataMember]
    public string Name
    {
        get;
        set;
    }
    [DataMember]
    public int Age
    {
        get;
        set;
    }
}

System.Web.Script.Serialization.JavaScriptSerializer js = new System.Web.Script.Serialization.JavaScriptSerializer();
List list = new List();
list.Add(new Student()
{
    age = 10,
    date = DateTime.Now,
    name = "宋兴柱  是个好孩\"子,这里\"有英文逗号"
});

var str = js.Serialize(list);
str = Regex.Replace(str, @"\\/Date\((\d+)\)\\/", match =>
{
    DateTime dt = new DateTime(1970, 1, 1);
    dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value)).ToLocalTime();
    return dt.ToString("yyyy-MM-dd HH:mm:ss");
});

IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy'年'MM'月'dd'日'" };
string json = JsonConvert.SerializeObject(jack, dtConverter);

var value = "/Date(1414078309687)/";

var da = eval('new ' + value.replace('/', '', 'g'));
//或者
var da = value.replace(/\/Date\((\d+)\)\//gi, '$1');   ////通过正则拿到里面数。g 全局 i不区分大小写

da.toLocaleDateString()  //2014/10/23
da.toLocaleTimeString()  //下午11:31:49