From ： http://www.cnblogs.com/litian/p/3870975.html
1.JSON序列化
string JsonStr= JsonConvert.SerializeObject(Entity);
eg:
A a=new A(); a.Name="Elain00"; a.Hobby="eat eat"; string jsonStr=JsonConvert.SerializeObject(a);
2.JSON反序列化
string jsonstr = "jsonString";
Class model = JsonConvert.DeserializeObject<Class>(jsonstr);
eg:
string JsonStr='"{\'Name\':\'Elaine00\',\'Hobby\':\'eat eat\'}";
A a=JsonConvert.DeserializeObject<A>(JsonStr);
3.时间格式处理
IsoDateTimeConverter timeFormat = new IsoDateTimeConverter();
timeFormat.DateTimeFormat = "yyyy-MM-dd HH:mm:ss";
Response.Write(JsonConvert.SerializeObject(bll.GetModelList(strWhere), Newtonsoft.Json.Formatting.Indented, timeFormat));
4.扩展方法
public static class NewtonJSONHelper
{
public static string SerializeObject(this object obj)
{
return JsonConvert.SerializeObject(obj, Formatting.Indented, new JsonSerializerSettings{
ReferenceLoopHandling = ReferenceLoopHandling.Ignore});
} public static T DeserializeObject<T>(this string data)
{
return JsonConvert.DeserializeObject<T>(data, new JsonSerializerSettings
{
ReferenceLoopHandling = ReferenceLoopHandling.Ignore
});
}
}
5.日期处理
public class LogEntry
{
public string Details { get; set; }
public DateTime LogDate { get; set; }
} public void WriteJsonDates()
{
LogEntry entry = new LogEntry
{
LogDate = new DateTime(2009, 2, 15, 0, 0, 0, DateTimeKind.Utc),
Details = "Application started."
}; // default as of Json.NET 4.5
string isoJson = JsonConvert.SerializeObject(entry);
// {"Details":"Application started.","LogDate":"2009-02-15T00:00:00Z"} JsonSerializerSettings microsoftDateFormatSettings = new JsonSerializerSettings
{
DateFormatHandling = DateFormatHandling.Micro
public class LimitPropsContractResolver : DefaultContractResolver
{
private string[] props = null; public LimitPropsContractResolver(string[] props)
{
this.props = props;
} protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
{
IList<JsonProperty> list = base.CreateProperties(type, memberSerialization);
IsoDateTimeConverter iso = new IsoDateTimeConverter() { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };
IList<JsonProperty> listWithConver = new List<JsonProperty>();
foreach (var item in list)
{
if (props.Contains(item.PropertyName))
{
if (item.PropertyType.ToString().Contains("System.DateTime"))
{
item.Converter = iso;
}
listWithConver.Add(item);
}
}
return listWithConver;
}
}
}
softDateFormat
};
string microsoftJson = JsonConvert.SerializeObject(entry, microsoftDateFormatSettings);
// {"Details":"Application started.","LogDate":"\/Date(1234656000000)\/"} string javascriptJson = JsonConvert.SerializeObject(entry, new JavaScriptDateTimeConverter());
// {"Details":"Application started.","LogDate":new Date(1234656000000)}
}
2.JSON反序列化 string jsonstr = "jsonString";
Class model = JsonConvert.DeserializeObject<Class>(jsonstr); eg: string JsonStr='"{\'Name\':\'Elaine00\',\'Hobby\':\'eat eat\'}";
A a=JsonConvert.DeserializeObject<A>(JsonStr);
一般是对于值类型的处理,通过设置jSetting.DefaultValueHandling的值来确定,该值为枚举类型.
DefaultValueHandling.Ignore |
序列化和反序列化时,忽略默认值 |
DefaultValueHandling.Include |
序列化和反序列化时,包含默认值 |
给成员设置默任值,用到"DefaultValue(value)"特性,当然别忘了引入命名空间"System.ComponentModel",假设员工的年龄默认值为30
[DefaultValue(30)]
public int Age { get; set; }
序列化时我想忽略为默认值的成员
Staff jack = new Staff { Name = "Jack", Age = 30, Gender = "Male", DepartmentName = "Personnel Department", Leader = null };
var jSetting = new JsonSerializerSettings();
jSetting.DefaultValueHandling = DefaultValueHandling.Ignore;
string json = JsonConvert.SerializeObject(jack,jSetting);
Console.WriteLine(json);
结果:
首先介绍Json.Net序列化的模式:OptOut 和 OptIn.
| OptOut | 默认值,类中所有公有成员会被序列化,如果不想被序列化,可以用特性JsonIgnore |
| OptIn | 默认情况下,所有的成员不会被序列化,类中的成员只有标有特性JsonProperty的才会被序列化,当类的成员很多,但客户端仅仅需要一部分数据时,很有用 |
假如客户仅仅需要员工的姓名,此时
[JsonObject(Newtonsoft.Json.MemberSerialization.OptIn)]
public class Staff
{
[JsonProperty]
public string Name { get; set; }
public int Age { get; set; }
public string Gender { get; set; }
public string DepartmentName { get; set; }
public Staff Leader { get; set; }
}
序列化:
Staff jack = new Staff { Name = "Jack", Age = 30, Gender = "Male", DepartmentName = "Personnel Department", Leader = null };
string json = JsonConvert.SerializeObject(jack);
结果:
如果客户不想要员工的领导信息
public class Staff
{
public string Name { get; set; }
public int Age { get; set; }
public string Gender { get; set; }
public string DepartmentName { get; set; }
[JsonIgnore]
public Staff Leader { get; set; }
}
序列化:
Staff tom = new Staff { Name = "Tome", Age = 42, Gender = "Male", DepartmentName = "Personnel Department"};
Staff jack = new Staff { Name = "Jack", Age = 30, Gender = "Male", DepartmentName = "Personnel Department", Leader = tom };
string json = JsonConvert.SerializeObject(jack);
Console.WriteLine(json);
结果:
Json.Net序列化对象时,默认情况下仅仅序列化公有成员,如果想要非公有成员也被序列化,就要在该成员上加特性"JsonProperty"
JsonConverters会在序列化和反序列化时被用到。JsonConverters允许手动对Json的控制。当Json的结构很复杂和你想改变一个类型怎么样被序列化时，这是非常有用的。当一个JsonConverters被添加到JsonSerializer时，它会检查每一要被序列化和反序列化的值，并返回CanConvert，如果为True,则JsonConverter读和写这个值；需要注意的是，虽然JsonConverter能够使你可以完全的控制Json的值，但是很多的Json.Net序列化的特性被限制，像是类型名称和引用处理。所有的JsonConvert都在命名空间 "Newtonsoft.Json.Converters"下
这是Json.Net中自带的两个处理日期的类,默认是IsoDateTimeConverter ,它的格式是"yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFFK".另一个是JavaScriptTimeConverter,它的格式是 "new Date(ticks)",其实返回的是一个JavaScript的Date对象.
有两种方式来应用JsonConverter,改变Json序列化和反序列化的行为.
假设我们为员工添加两个日期类型的成员,出生日期和入职日期
public class Staff
{
public string Name { get; set; }
public int Age { get; set; }
public string Gender { get; set; }
public string DepartmentName { get; set; }
public Staff Leader { get; set; }
public DateTime BirthDate { get; set; }
public DateTime EmploymentDate { get; set; }
}
我们的客户要求日期类型的成员返回javascript的日期对象
Staff jack = new Staff { Name = "Jack", Age = 30, Gender = "Male",
DepartmentName = "Personnel Department", BirthDate = new DateTime(1982,2,12), EmploymentDate = new DateTime(2010,12,12) };
string json = JsonConvert.SerializeObject(jack,new JavaScriptDateTimeConverter());
Console.WriteLine(json);
结果:
现在我们的客户要求出生日期以"ISO"标准日期格式返回,入职日期以Javascript的Date对象格式返回,修改我们的员工类
public class Staff
{
public string Name { get; set; }
public int Age { get; set; }
public string Gender { get; set; }
public string DepartmentName { get; set; }
public Staff Leader { get; set; }
[JsonConverter(typeof(IsoDateTimeConverter))]
public DateTime BirthDate { get; set; }
[JsonConverter(typeof(JavaScriptDateTimeConverter))]
public DateTime EmploymentDate { get; set; }
}
是的,通过特性"JsonConverter"来实现差异化的
序列化:
Staff jack = new Staff { Name = "Jack", Age = 30, Gender = "Male",
DepartmentName = "Personnel Department", BirthDate = new DateTime(1982,2,12), EmploymentDate = new DateTime(2010,12,12) };
string json = JsonConvert.SerializeObject(jack);
Console.WriteLine(json);
结果:
客户现在提出要求,希望得到的日期格式是符合中国人习惯的格式.要求返回的格式是"2012年4月20日".挑战来了,没有挑战就没有进步,我喜欢挑战.光说是没有用的!先分析一下怎么解决这个问题.我考虑了两种思路.
思路一:
研究了一下上面两个日期处理类,发现他们都是继承了基类"DateTimeConverterBase",所以我们可以参考"IsoDatetimeConverter"的实现方式,自己新建一个处理日期格式的转换器类.这种方式的缺点是可能要花大量的时间去研究,比较费时费力.优点就是可以对日期格式随心所欲的控制.
思路二:
我又研究了一下"IsoDatetimeConverter",发现它的日期格式其实是由于内部DefaultDateTimeFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFFK"导致,而它也提供了修改日期样式的属性"DateTimeFormat",只要我们按照这种格式来写就OK了.
Staff jack = new Staff { Name = "Jack", Age = 30, Gender = "Male",
DepartmentName = "Personnel Department", BirthDate = new DateTime(1982,2,12), EmploymentDate = new DateTime(2010,12,12) };
IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy'年'MM'月'dd'日'" };
string json = JsonConvert.SerializeObject(jack,dtConverter);
Console.WriteLine(json);
结果:
public class Person
{
public int Id { get; set; } public string Name { get; set; }
}
默认序列化的结果为: {"Id":1,"Name":"杨过"},如果不想用默认的字段名称，可以使用如下方式：
public class Person
{
[JsonProperty(PropertyName = "PersonId")]
public int Id { get; set; } [JsonProperty(PropertyName = "PersonName")]
public string Name { get; set; }
}
这样序列化的结果为：{"PersonId":1,"PersonName":"杨过"}