C#中对象与JSON字符串互相转换的三种方式_基础知识_

 class JsonNewtonsoft { /// 
 /// 把对象转换为JSON字符串 /// 
 /// 对象 /// JSON字符串 public static string ToJSON(this object o) { if (o == null) { return null; } return JsonConvert.SerializeObject(o); } /// 
 /// 把Json文本转为实体 /// 
 ///  ///  ///  public static T FromJSON(this string input) { try { return JsonConvert.DeserializeObject(input); } catch (Exception ex) { return default(T); } } }

 class JsonDataContractJsonSerializer { /// 
 /// 内存对象转换为json字符串 /// 
 ///  ///  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); } /// 
 /// Json字符串转内存对象 /// 
 ///  ///  ///  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); } }

 public static class JsonJavaScriptSerializer { /// 
 /// 内存对象转换为json字符串 /// 
 ///  ///  public static string ToJSON(object obj) { StringBuilder sb = new StringBuilder(); JavaScriptSerializer json = new JavaScriptSerializer(); json.Serialize(obj, sb); return sb.ToString(); } /// 
 /// Json字符串转内存对象 /// 
 ///  ///  ///  public static T FromJSON(string jsonString) { JavaScriptSerializer json = new JavaScriptSerializer(); return json.Deserialize(jsonString); } }

 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; } }

 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(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(jsonStr3); Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}", stobj3.Name, stobj3.Age, stobj3.Sex); Console.ReadKey(); }