C# 对象与JSON字符串互相转换的几种方式
随着 Rest 风格 API 的应用越来越广泛，对象与JSON字符串互相转换的功能也用的越来越多。这里介绍三种方法，期中两种为DotNet Framework .NET 3.5 及后续版本自带的 DataContractJsonSerializer、 JavaScriptSerializer，另一种为 Newtonsoft.Json.dll ，我选择它的原因是因为它支持 DotNet Framework .NET 2.0。
方法一、DoNet2.0 需要借助于Newtonsoft.Json.dll
我使用的版本是：Version 10.0.3
// 从一个对象信息生成Json串
public static string ObjectToJson(object obj)
{
return JsonConvert.SerializeObject(obj);
}
// 从一个Json串生成对象信息
public static object JsonToObject(string jsonString, object obj)
{
return JsonConvert.DeserializeObject(jsonString, obj.GetType());
}方法二、DataContractJsonSerializer
///
/// Json转换成对象
///
/// (string jsonText)
{
// Framework 2.0 不支持
DataContractJsonSerializer s = new DataContractJsonSerializer(typeof(T));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonText));
T obj = (T)s.ReadObject(ms);
ms.Dispose();
return obj;
}
///
/// 对象转换成JSON
///
/// (T obj)
{
// Framework 2.0 不支持
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));
string result = string.Empty;
using (MemoryStream ms = new MemoryStream())
{
serializer.WriteObject(ms, obj);
ms.Position = 0;
using (StreamReader read = new StreamReader(ms))
{
result = read.ReadToEnd();
}
}
return result;
} namespace SL_DataContractJsonSerializer
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
}
//This uses an event handler, not SL data binding
void OnClick(object sender, EventArgs args)
{
txtOutput1.Text = "Create a User object and serialize it.";
string json = WriteFromObject();
txtOutput2.Text = json.ToString(); // Displays: {"Age":42,"Name":"Bob"}
txtOutput3.Text = "Deserialize the data to a User object.";
string jsonString = "{'Name':'Bill', 'Age':53}";
User deserializedUser = ReadToObject(jsonString);
txtOutput4.Text = deserializedUser.Name; // Displays: Bill
txtOutput5.Text = deserializedUser.Age.ToString(); // Displays: 53
}
// Create a User object and serialize it to a JSON stream.
public static string WriteFromObject()
{
//Create User object.
User user = new User("Bob", 42);
//Create a stream to serialize the object to.
MemoryStream ms = new MemoryStream();
// Serializer the User object to the stream.
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(User));
ser.WriteObject(ms, user);
byte[] json = ms.ToArray();
ms.Close();
return Encoding.UTF8.GetString(json, 0, json.Length);
}
// Deserialize a JSON stream to a User object.
public static User ReadToObject(string json)
{
User deserializedUser = new User();
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json));
DataContractJsonSerializer ser = new DataContractJsonSerializer(deserializedUser.GetType());
deserializedUser = ser.ReadObject(ms) as User;
ms.Close();
return deserializedUser;
}
}
[DataContract]
public class User
{
[DataMember]
public string Name { get; set; }
[DataMember]
public int Age { get; set; }
public User() { }
public User(string newName, int newAge)
{
Name = newName;
Age = newAge;
}
}
}方法三、JavaScriptSerializer
public static void JsonMy(string json)
{
JavaScriptSerializer js = new JavaScriptSerializer(); //实例化一个能够序列化数据的类
ToJsonMy list = js.Deserialize(json); //将json数据转化为对象类型并赋值给list
string result = list.result;
string res_info = list.res_info;
string queryorder_info = list.res_info;
}
public static void JsonMy4(string json)
{
JavaScriptSerializer js = new JavaScriptSerializer(); //实例化一个能够序列化数据的类
ToJsonMy3 list = js.Deserialize(json); //将json数据转化为对象类型并赋值给list
string result = list.result;
string res_info = list.res_info;
string order_num = list.queryorder_info.order_num;
List orderdetail = list.queryorder_info.orderdetail;
string CFTUin = orderdetail[0].CFTUin;
string HotelName = orderdetail[0].HotelName;
string ListID = orderdetail[1].ListID;
string State = orderdetail[2].State;
} 功能对比
性能对比
JSON转C#实体类
相关参考：
https://www.newtonsoft.com/json
DataContractJsonSerializer 类