发布：2020/9/19 16:03:25作者：管理员 来源：本站 浏览次数：1043
JSON(JavaScript Object Notation, JS 对象标记) 是一种轻量级的数据交换格式。
关于内存对象和JSON字符串的相互转换，在实际项目中应比较广泛，经过一番搜索，找到如下三种方法来解决此问题
分别是使用 Newtonsoft.Json.dll、DataContractJsonSerializer、 JavaScriptSerializer。
方法一： Newtonsoft.Json.dll
Newtonsoft.Json.dll在.net2.0之后的版本可以支持 我的版本.net framework4.0
添加Newtonsoft.json的引用
对象与json字符串转换类设计
class JsonNewtonsoft
{
/// <summary>
/// 把对象转换为JSON字符串
/// </summary>
/// <param name="o">对象</param>
/// <returns>JSON字符串</returns>
public static string ToJSON(this object o)
{
if (o == null)
{
return null;
}
return JsonConvert.SerializeObject(o);
}
/// <summary>
/// 把Json文本转为实体
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="input"></param>
/// <returns></returns>
public static T FromJSON<T>(this string input)
{
try
{
return JsonConvert.DeserializeObject<T>(input);
}
catch (Exception ex)
{
return default(T);
}
}
}
方法二：DataContractJsonSerializer
使用这种 需要引用 System.Runtime.Serialization.dll
类设计
class JsonDataContractJsonSerializer{
/// <summary>
/// 内存对象转换为json字符串
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
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);
}
/// <summary>
/// Json字符串转内存对象
/// </summary>
/// <param name="jsonString"></param>
/// <param name="obj"></param>
/// <returns></returns>
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);
}
}
方法三：JavaScriptSerializer
需要引用：System.Web.Extensions.dll
类设计
public static class JsonJavaScriptSerializer{
/// <summary>
/// 内存对象转换为json字符串
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static string ToJSON(object obj)
{
StringBuilder sb = new StringBuilder();
JavaScriptSerializer json = new JavaScriptSerializer();
json.Serialize(obj, sb);
return sb.ToString();
}
/// <summary>
/// Json字符串转内存对象
/// </summary>
/// <param name="jsonString"></param>
/// <param name="obj"></param>
/// <returns></returns>
public static T FromJSON<T>(string jsonString)
{
JavaScriptSerializer json = new JavaScriptSerializer();
return json.Deserialize<T>(jsonString);
}
}
程序测试：
新建一个测试对象类Student.cs
public enum Sex{
男=0,
女=1
}
[Serializable()]
class Student
{
private string _name;
public string Name
{
get { return _name; }
set { _name = value; }
}
private int _age;
public int Age
{
get { return _age; }
set { _age = value; }
}
private Sex _sex = Sex.男;
public Sex Sex
{
get { return _sex; }
set { _sex = value; }
}
public Student()
{ }
public Student(string name,int age,Sex sex)
{
this._name = name;
this._age = age;
this._sex = sex;
}
}
测试程序
static void Main(string[] args)
{
Student st = new Student("笨男孩",22,Sex.男);
Console.WriteLine("============方法一============================================");
//方法一
Console.WriteLine("方法一对象转Json字符串");
string jsonStr = JsonNewtonsoft.ToJSON(st);
Console.WriteLine(jsonStr);
Console.WriteLine("方法一Json字符串转对象");
Student stobj = (Student)JsonNewtonsoft.FromJSON<Student>(jsonStr);
Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}",stobj.Name,stobj.Age,stobj.Sex);
Console.WriteLine("============方法二============================================");
//方法二
Console.WriteLine("方法二对象转Json字符串");
string jsonStr2 = JsonDataContractJsonSerializer.ToJSON(st);
Console.WriteLine(jsonStr2);
Console.WriteLine("方法二Json字符串转对象");
Student stobj2 = (Student)JsonDataContractJsonSerializer.FromJSON(jsonStr2, st);
Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}", stobj2.Name, stobj2.Age, stobj2.Sex);
Console.WriteLine("============方法三============================================");
//方法二
Console.WriteLine("方法三对象转Json字符串");
string jsonStr3 = JsonJavaScriptSerializer.ToJSON(st);
Console.WriteLine(jsonStr3);
Console.WriteLine("方法三Json字符串转对象");
Student stobj3 = (Student)JsonJavaScriptSerializer.FromJSON<Student>(jsonStr3);
Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}", stobj3.Name, stobj3.Age, stobj3.Sex);
Console.ReadKey();
}
程序工程源文件下载
功能对比：
性能对比：
综上所述，一般采用Json.NET方法一比较好！
参考：
JavaScriptSerializer 类介绍 https://msdn.microsoft.com/zh-cn/library/system.web.script.serialization.javascriptserializer(v=vs.110).aspx
DataContractJsonSerializer类介绍 https://msdn.microsoft.com/zh-cn/library/system.runtime.serialization.json.datacontractjsonserializer(v=vs.110).aspx
https://blog.csdn.net/testcs_dn/article/details/78150046?locationNum=6&fps=1
