C# JSON字符串序列化与反序列化

综合了下面两篇文章。

http://www.cnblogs.com/Jan_Dai/archive/2010/11/09/1872821.html

http://www.cnblogs.com/dwfbenben/archive/2013/06/06/3122662.html

 

C#对象和json互转

代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;（需要手工添加引用后System.Runtime.Serialization才有，net3.5及其以后自动包含了json）

namespace CrjIIOfflineAccept.CrjIITools
{
public class JsonTools
{
// 从一个对象信息生成Json串
public static string ObjectToJson(object obj)
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
MemoryStream stream = new MemoryStream();
serializer.WriteObject(stream, obj);
byte[] dataBytes = new byte[stream.Length];
stream.Position = 0;
stream.Read(dataBytes, 0, (int)stream.Length);
return Encoding.UTF8.GetString(dataBytes);
}
// 从一个Json串生成对象信息
public static object JsonToObject(string jsonString, object obj)
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
MemoryStream mStream = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
return serializer.ReadObject(mStream);
}
}
}

测试用的entity

[Serializable]
public class Entity1
{
private String _DisplayName;

public String DisplayName
{
get { return _DisplayName; }
set { _DisplayName = value; }
}
private String _IconName;

public String IconName
{
get { return _IconName; }
set { _IconName = value; }
}
private String _ClientProperties;

public String ClientProperties
{
get { return _ClientProperties; }
set { _ClientProperties = value; }
}

public Entity1(String displayName,String iconName,String clientProperties)
{
_DisplayName = displayName;
_IconName = iconName;
_ClientProperties = clientProperties;
}
}

 

测试代码：

Entity1 entity = new Entity1("node1","xxx.png","属性1=值1,属性2=值2");
String jsonString = JsonTools.ObjectToJson(entity);

 

--------------------------------------------------------------------------------------------------

C#将对象序列化成JSON字符串

public string GetJsonString()
{
    List<Product> products = new List<Product>(){
    new Product(){Name="苹果",Price=5.5},
    new Product(){Name="橘子",Price=2.5},
    new Product(){Name="干柿子",Price=16.00}
    };
    ProductList productlist = new ProductList();
    productlist.GetProducts = products;
    return new JavaScriptSerializer().Serialize(productlist));
}

public class Product
{
    public string Name { get; set; }
    public double Price { get; set; }
}

public class ProductList
{
    public List<Product> GetProducts { get; set; }
}

这里主要是使用JavaScriptSerializer来实现序列化操作，这样我们就可以把对象转换成Json格式的字符串，生成的结果如下：

{"GetProducts":[{"Name":"苹果","Price":5.5},{"Name":"橘子","Price":2.5},{"Name":"柿子","Price":16}]}

 

如何将Json字符串转换成对象使用呢？

在实际开发中，经常有可能遇到用JS传递一个Json格式的字符串到后台使用，如果能自动将字符串转换成想要的对象，那进行遍历或其他操作时，就方便多了。那具体是如何实现的呢？

添加引用System.Web.Extensions,

.net3.5+版本都有，如果VS2010找不到，在这个文件夹找：C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\

再using System.Web.Script.Serialization;即可

public static List<T> JSONStringToList<T>(this string JsonStr)
{
    JavaScriptSerializer Serializer = new JavaScriptSerializer();
    List<T> objs = Serializer.Deserialize<List<T>>(JsonStr);
    return objs;
}

public static T Deserialize<T>(string json)
{
    T obj = Activator.CreateInstance<T>();
    using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
    {
        DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
        return (T)serializer.ReadObject(ms);
    }
}

string JsonStr = "[{Name:'苹果',Price:5.5},{Name:'橘子',Price:2.5},{Name:'柿子',Price:16}]";
List<Product> products = new List<Product>();
products = JSONStringToList<Product>(JsonStr);

foreach (var item in products)
{
    Response.Write(item.Name + ":" + item.Price + "<br />");
}

public class Product
{
    public string Name { get; set; }
    public double Price { get; set; }
}

在上面的例子中，可以很方便的将Json字符串转换成List对象，操作的时候就方便多了~