JSON(JavaScriptObject 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
添加Newtonsoft.json的引用
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
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
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();}
程序运行结果：
