JSON使用JsonIgnoreAttribute,ErrorHandlingAttribute,DefaultValueAttribute

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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

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