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
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
1class JsonNewtonsoft2{3 /// <summary>4 /// 把对象转换为JSON字符串5 /// </summary>6 /// <param name="o">对象</param>7 /// <returns>JSON字符串</returns>8 public static string ToJSON(this object o)9 {10 if (o == null)11 {12 return null;13 }14 return JsonConvert.SerializeObject(o);15 }16 /// <summary>17 /// 把Json文本转为实体18 /// </summary>19 /// <typeparam name="T"></typeparam>20 /// <param name="input"></param>21 /// <returns></returns>22 public static T FromJSON<T>(this string input)23 {24 try25 {26 return JsonConvert.DeserializeObject<T>(input);27 }28 catch (Exception ex)29 {30 return default(T);31 }32 }33}
方法二：DataContractJsonSerializer
使用这种 需要引用System.Runtime.Serialization.dll
类设计
1 class JsonDataContractJsonSerializer2{3 /// <summary>4 /// 内存对象转换为json字符串5 /// </summary>6 /// <param name="obj"></param>7 /// <returns></returns>8 public static string ObjectToJson(object obj)9 {10 DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());11 MemoryStream stream = new MemoryStream();12 serializer.WriteObject(stream, obj);13 byte[] dataBytes = new byte[stream.Length];14 stream.Position = 0;15 stream.Read(dataBytes, 0, (int)stream.Length);16 return Encoding.UTF8.GetString(dataBytes);17 }18 /// <summary>19 /// Json字符串转内存对象20 /// </summary>21 /// <param name="jsonString"></param>22 /// <param name="obj"></param>23 /// <returns></returns>24 public static object JsonToObject(string jsonString, object obj)25 {26 DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());27 MemoryStream mStream = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));28 return serializer.ReadObject(mStream);29 }30}
方法三：JavaScriptSerializer
需要引用：System.Web.Extensions.dll
类设计
1public static class JsonJavaScriptSerializer2{3 /// <summary>4 /// 内存对象转换为json字符串5 /// </summary>6 /// <param name="obj"></param>7 /// <returns></returns>8 public static string ToJSON(object obj)9 {10 StringBuilder sb = new StringBuilder();11 JavaScriptSerializer json = new JavaScriptSerializer();12 json.Serialize(obj, sb);13 return sb.ToString();14 }15 /// <summary>16 /// Json字符串转内存对象17 /// </summary>18 /// <param name="jsonString"></param>19 /// <param name="obj"></param>20 /// <returns></returns>21 public static T FromJSON<T>(string jsonString)22 {23 JavaScriptSerializer json = new JavaScriptSerializer();24 return json.Deserialize<T>(jsonString);25 }26 27}
程序测试：
新建一个测试对象类Student.cs
1public enum Sex2{3 男=0,4 女=15}6[Serializable()]7class Student8{9 private string _name;10 11 public string Name12 {13 get { return _name; }14 set { _name = value; }15 }16 17 private int _age;18 19 public int Age20 {21 get { return _age; }22 set { _age = value; }23 }24 25 private Sex _sex = Sex.男;26 27 public Sex Sex28 {29 get { return _sex; }30 set { _sex = value; }31 }32 public Student()33 { }34 public Student(string name,int age,Sex sex)35 {36 this._name = name;37 this._age = age;38 this._sex = sex;39 }40}
测试程序
1 static void Main(string[] args)2 {3 Student st = new Student("笨男孩",22,Sex.男);4 5 Console.WriteLine("============方法一============================================");6 //方法一7 8 Console.WriteLine("方法一对象转Json字符串");9 string jsonStr = JsonNewtonsoft.ToJSON(st);10 Console.WriteLine(jsonStr);11 Console.WriteLine("方法一Json字符串转对象");12 Student stobj = (Student)JsonNewtonsoft.FromJSON<Student>(jsonStr);13 Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}",stobj.Name,stobj.Age,stobj.Sex);14 15 16 Console.WriteLine("============方法二============================================");17 //方法二18 Console.WriteLine("方法二对象转Json字符串");19 string jsonStr2 = JsonDataContractJsonSerializer.ToJSON(st);20 Console.WriteLine(jsonStr2);21 Console.WriteLine("方法二Json字符串转对象");22 Student stobj2 = (Student)JsonDataContractJsonSerializer.FromJSON(jsonStr2, st);23 Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}", stobj2.Name, stobj2.Age, stobj2.Sex);24 25 26 Console.WriteLine("============方法三============================================");27 //方法二28 Console.WriteLine("方法三对象转Json字符串");29 string jsonStr3 = JsonJavaScriptSerializer.ToJSON(st);30 Console.WriteLine(jsonStr3);31 Console.WriteLine("方法三Json字符串转对象");32 Student stobj3 = (Student)JsonJavaScriptSerializer.FromJSON<Student>(jsonStr3);33 Console.WriteLine("姓名:{0} 年龄:{1} 性别:{2}", stobj3.Name, stobj3.Age, stobj3.Sex);34 35 Console.ReadKey();36 }
程序运行结果：
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