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
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(); }
程序运行结果:
运行结果:
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
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