C#-对象与JSON字符串互相转换的三种方式

------------------------------------------------------------------------C#-对象与JSON字符串互相转换的三种方式C#对象与JSON字符串互相转换的三种方式JSON(JavaScript

ObjectNotation,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.netframework4.0添加Newtonsoft.json的引用对象与json字符串转换类设计1classJsonNewtonsoft2{3///<summary>4///把对象转换为JSON字符串5///</summary>6///<paramname="o">对象</param>7///<returns>JSON字符串</returns>8publicstaticstringToJSON(thisobjecto)9{10if(o==null)11{12returnnull;13}14returnJsonConvert.SerializeObject(o);15}16///<summary>17///把Json文本转为实体18///</summary>19///<typeparamname="T"></typeparam>20///<paramname="input"></param>21///<returns></returns>22publicstaticTFromJSON<T>(thisstringinput)23{24try25{26returnJsonConvert.DeserializeObject<T>(input);27}28catch(Exceptionex)29{30returndefault(T);31}32}33}方法二：DataContractJsonSerializer

使用这种需要引用

System.Runtime.Serialization.dll类设计1classJsonDataContractJsonSerializer2{3///<summary>4///内存对象转换为json字符串5///</summary>6///<paramname="obj"></param>7///<returns></returns>8publicstaticstringObjectToJson(objectobj)9{10DataContractJsonSerializerserializer=newDataContractJsonSerializer(obj.GetType());11MemoryStreamstream=newMemoryStream();12serializer.WriteObject(stream,obj);13byte[]dataBytes=newbyte[stream.Length];14stream.Position=0;15stream.Read(dataBytes,0,(int)stream.Length);16returnEncoding.UTF8.GetString(dataBytes);17}18///<summary>19///Json字符串转内存对象20///</summary>21///<paramname="jsonString"></param>22///<paramname="obj"></param>23///<returns></returns>24publicstaticobjectJsonToObject(stringjsonString,objectobj)25{26DataContractJsonSerializerserializer=newDataContractJsonSerializer(obj.GetType());27MemoryStreammStream=newMemoryStream(Encoding.UTF8.GetBytes(jsonString));28returnserializer.ReadObject(mStream);29}30}方法三：JavaScriptSerializer需要引用：System.Web.Extensions.dll类设计1publicstaticclassJsonJavaScriptSerializer2{3///<summary>4///内存对象转换为json字符串5///</summary>6///<paramname="obj"></param>7///<returns></returns>8publicstaticstringToJSON(objectobj)9{10StringBuildersb=newStringBuilder();11JavaScriptSerializerjson=newJavaScriptSerializer();12json.Serialize(obj,sb);13returnsb.ToString();14}15///<summary>16///Json字符串转内存对象17///</summary>18///<paramname="jsonString"></param>19///<paramname="obj"></param>20///<returns></returns>21publicstaticTFromJSON<T>(stringjsonString)22{23JavaScriptSerializerjson=newJavaScriptSerializer();24returnjson.Deserialize<T>(jsonString);25}2627}程序测试：新建一个测试对象类Student.cs1publicenumSex2{3男=0,4女=15}6[Serializable()]7classStudent8{9privatestring_name;1011publicstringName12{13get{return_name;}14set{_name=value;}15}1617privateint_age;1819publicintAge20{21get{return_age;}22set{_age=value;}23}2425privateSex_sex=Sex.男;2627publicSexSex28{29get{return_sex;}30set{_sex=value;}31}32publicStudent()33{}34publicStudent(stringname,intage,Sexsex)35{36this._name=name;37this._age=age;38this._sex=sex;39}40}测试程序1staticvoidMain(string[]args)2{3Studentst=newStudent("笨男孩",22,Sex.男);45Console.WriteLine("============方法一============================================");6//方法一78Console.WriteLine("方法一对象转Json字符串");9stringjsonStr=JsonNewtonsoft.ToJSON(st);10Console.WriteLine(jsonStr);11Console.WriteLine("方法一Json字符串转对象");12Studentstobj=(Student)JsonNewtonsoft.FromJSON<Student>(jsonStr);13Console.WriteLine("姓名:{0}年龄:{1}性别:{2}",stobj.Name,stobj.Age,stobj.Sex);141516Console.WriteLine("============方法二============================================");17//方法二18Console.WriteLine("方法二对象转Json字符串");19stringjsonStr2=JsonDataContractJsonSerializer.ToJSON(st);20Console.WriteLine(jsonStr2);21Console.WriteLine("方法二Json字符串转对象");22Studentstobj2=(Student)JsonDataContractJsonSerializer.FromJSON(jsonStr2,st);23Console.WriteLine("姓名:{0}年龄:{1}性别:{2}",stobj2.Name,stobj2.Age,stobj2.Sex);242526Console.WriteLine("============方法三=