JSON使用JsonIgnoreAttribute,ErrorHandlingAttribute,DefaultValueAttribute

一、使用JsonIgnoreAttribute忽略其属性序列化
1.创建一个Movie对象，并在其属性上添加JsonIgnore.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using GongHuiNewtonsoft.Json;

namespace JSONDemo
{
public class Movie
{
public string Name { get; set; }

public string Director { get; set; }

[JsonIgnore]
public DateTime? LaunchDate { get; set; }
}
}

2.实例化对象Movie,并给其忽略的属性赋值。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using GongHuiNewtonsoft.Json;
using GongHuiNewtonsoft.Json.Serialization;
using GongHuiNewtonsoft.Json.Converters;

namespace JSONDemo
{
class Program
{
static void Main(string[] args)
{
Movie m = new Movie
{
Name = "爱情呼叫转移",
Director = "张建亚",
LaunchDate=DateTime.Today
};

string json = JsonConvert.SerializeObject(m, Formatting.Indented);
Console.WriteLine(json);
}
}
}

3.运行结果



二、使用ErrorHandlingAttribute忽略其属性异常
1.先创建一个Employee对象,必须得在属性Roles中get中添加抛出异常,然后用内部方法OnError,忽略其异常

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using GongHuiNewtonsoft.Json.Serialization;
using System.Runtime.Serialization;

namespace JSONDemo
{
public class Employee
{
private List<string> _roles;

public string Name { get; set; }
public int Age { get; set; }

public List<string> Roles
{
get
{
if (_roles == null)
throw new Exception("Roles not loaded!");

return _roles;
}
set { _roles = value; }
}

[OnError]
internal void OnError(StreamingContext context, ErrorContext error)
{
error.Handled = true;
}
}
}

2.调用代码,先实例化对象Employee,设置Roles属性为空,引发异常.这里,因为用了OnError方法,所以其异常忽略.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using GongHuiNewtonsoft.Json;
using GongHuiNewtonsoft.Json.Serialization;
using GongHuiNewtonsoft.Json.Converters;

namespace JSONDemo
{
class Program
{
static void Main(string[] args)
{
Employee employee = new Employee
{
Name = "GongHui",
Age = 28,
Roles = null
};

string json = JsonConvert.SerializeObject(employee, Formatting.Indented);
Console.WriteLine(json);
}
}
}

3.运行的结果



三、使用DefaultValueAttribute设置属性默认值
1.先创建一个Address类,然后引用System.ComponentModel,设置属性的默认值.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace JSONDemo
{
public class Address
{
public string Province { get; set; }
public string City { get; set; }
public string County { get; set; }

[DefaultValue("GuangZhou")]
public string DetailAddress
{
get{ return County + " " + City + " " + Province; }
}
}
}

2.实例化Address对象,

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using GongHuiNewtonsoft.Json;
using GongHuiNewtonsoft.Json.Serialization;
using GongHuiNewtonsoft.Json.Converters;

namespace JSONDemo
{
class Program
{
static void Main(string[] args)
{
Address address = new Address();

Console.WriteLine("----------------显示所有序列化成员---------------");
string json = JsonConvert.SerializeObject(address, Formatting.Indented);
Console.WriteLine(json);

Console.WriteLine("----------------仅显示添加默认值的成员-------------");
string json1 = JsonConvert.SerializeObject(address, Formatting.Indented, new JsonSerializerSettings
{
DefaultValueHandling = DefaultValueHandling.Ignore
});
Console.WriteLine(json1);
}
}
}

3.运行的结果



JSON源代码下载地址：http://download.csdn.net/detail/lovegonghui/9342751