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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.dllNewtonsoft.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1 class JsonNewtonsoft 2 { 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 try 25 { 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 JsonDataContractJsonSerializer 2 { 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1 public static class JsonJavaScriptSerializer 2 { 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.cs1 public enum Sex 2 { 3 男=0, 4 女=1 5 } 6 [Serializable()] 7 class Student 8 { 9 private string _name; 10 11 public string Name 12 { 13 get { return _name; } 14 set { _name = value; } 15 } 16 17 private int _age; 18 19 public int Age 20 { 21 get { return _age; } 22 set { _age = value; } 23 } 24 25 private Sex _sex = Sex.男; 26 27 public Sex Sex 28 { 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:运行结果: 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
转载:https://www.cnblogs.com/JiYF/p/8628942.html |
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