Newtonsoft.Json，一款.NET中开源的Json序列化和反序列化类库(下载地址http://json.codeplex.com/)。
下面是Json序列化和反序列化的简单封装：
1 /// <summary> 2 /// Json帮助类 3 /// </summary> 4 public class JsonHelper 5 { 6 /// <summary> 7 /// 将对象序列化为JSON格式 8 /// </summary> 9 /// <param name="o">对象</param> 10 /// <returns>json字符串</returns> 11 public static string SerializeObject(object o) 12 { 13 string json = JsonConvert.SerializeObject(o); 14 return json; 15 } 16 17 /// <summary> 18 /// 解析JSON字符串生成对象实体 19 /// </summary> 20 /// <typeparam name="T">对象类型</typeparam> 21 /// <param name="json">json字符串(eg.{"ID":"112","Name":"石子儿"})</param> 22 /// <returns>对象实体</returns> 23 public static T DeserializeJsonToObject<T>(string json) where T : class 24 { 25 JsonSerializer serializer = new JsonSerializer(); 26 StringReader sr = new StringReader(json); 27 object o = serializer.Deserialize(new JsonTextReader(sr), typeof(T)); 28 T t = o as T; 29 return t; 30 } 31 32 /// <summary> 33 /// 解析JSON数组生成对象实体集合 34 /// </summary> 35 /// <typeparam name="T">对象类型</typeparam> 36 /// <param name="json">json数组字符串(eg.[{"ID":"112","Name":"石子儿"}])</param> 37 /// <returns>对象实体集合</returns> 38 public static List<T> DeserializeJsonToList<T>(string json) where T : class 39 { 40 JsonSerializer serializer = new JsonSerializer(); 41 StringReader sr = new StringReader(json); 42 object o = serializer.Deserialize(new JsonTextReader(sr), typeof(List<T>)); 43 List<T> list = o as List<T>; 44 return list; 45 } 46 47 /// <summary> 48 /// 反序列化JSON到给定的匿名对象. 49 /// </summary> 50 /// <typeparam name="T">匿名对象类型</typeparam> 51 /// <param name="json">json字符串</param> 52 /// <param name="anonymousTypeObject">匿名对象</param> 53 /// <returns>匿名对象</returns> 54 public static T DeserializeAnonymousType<T>(string json, T anonymousTypeObject) 55 { 56 T t = JsonConvert.DeserializeAnonymousType(json, anonymousTypeObject); 57 return t; 58 } 59 }
为进一步理解Newtonsoft，写了一些测试的例子：
1 /// <summary> 2 /// Json测试 3 /// </summary> 4 public class JsonTest : IRun 5 { 6 public void Run() 7 { 8 Student sdudent = new Student(); 9 sdudent.ID = 1; 10 sdudent.Name = "陈晨"; 11 sdudent.NickName = "石子儿"; 12 sdudent.Class = new Class() { Name = "CS0216", ID = 0216 }; 13 14 //实体序列化和反序列化 15 string json1 = JsonHelper.SerializeObject(sdudent); 16 //json1 : {"ID":1,"Name":"陈晨","NickName":"石子儿","Class":{"ID":216,"Name":"CS0216"}} 17 Student sdudent1 = JsonHelper.DeserializeJsonToObject<Student>(json1); 18 19 //实体集合序列化和反序列化 20 List<Student> sdudentList = new List<Student>() { sdudent, sdudent1 }; 21 string json2 = JsonHelper.SerializeObject(sdudentList); 22 //json: [{"ID":1,"Name":"陈晨","NickName":"石子儿","Class":{"ID":216,"Name":"CS0216"}},{"ID":1,"Name":"陈晨","NickName":"石子儿","Class":{"ID":216,"Name":"CS0216"}}] 23 List<Student> sdudentList2 = JsonHelper.DeserializeJsonToList<Student>(json2); 24 25 //DataTable序列化和反序列化 26 DataTable dt = new DataTable(); 27 dt.TableName = "Student"; 28 dt.Columns.Add("ID", typeof(int)); 29 dt.Columns.Add("Name"); 30 dt.Columns.Add("NickName"); 31 DataRow dr = dt.NewRow(); 32 dr["ID"] = 112; 33 dr["Name"] = "战三"; 34 dr["NickName"] = "小三"; 35 dt.Rows.Add(dr); 36 string json3 = JsonHelper.SerializeObject(dt); 37 //json3 : [{"ID":112,"Name":"战三","NickName":"小三"}] 38 DataTable sdudentDt3 = JsonHelper.DeserializeJsonToObject<DataTable>(json3); 39 List<Student> sdudentList3 = JsonHelper.DeserializeJsonToList<Student>(json3); 40 41 //验证对象和数组 42 Student sdudent4 = JsonHelper.DeserializeJsonToObject<Student>("{"ID":"112","Name":"石子儿"}"); 43 List<Student> sdudentList4 = JsonHelper.DeserializeJsonToList<Student>("[{"ID":"112","Name":"石子儿"}]"); 44 45 //匿名对象解析 46 var tempEntity = new { ID = 0, Name = string.Empty }; 47 string json5 = JsonHelper.SerializeObject(tempEntity); 48 //json5 : {"ID":0,"Name":""} 49 tempEntity = JsonHelper.DeserializeAnonymousType("{"ID":"112","Name":"石子儿"}", tempEntity); 50 var tempStudent = new Student(); 51 tempStudent = JsonHelper.DeserializeAnonymousType("{"ID":"112","Name":"石子儿"}", tempStudent); 52 53 Console.Read(); 54 } 55 56 } 57 58 /// <summary> 59 /// 学生信息实体 60 /// </summary> 61 public class Student 62 { 63 public int ID { get; set; } 64 public string Name { get; set; } 65 public string NickName { get; set; } 66 public Class Class { get; set; } 67 } 68 69 /// <summary> 70 /// 学生班级实体 71 /// </summary> 72 public class Class 73 { 74 public int ID { get; set; } 75 public string Name { get; set; } 76 }
使用Json帮助类时，有两点需要注意下：
1. 通常使用调用实体序列化SerializeObject()和反序列化DeserializeJsonToObject()两个方法就可以了。但有些情况下我们解析json字符串时，可能没有对应的实体类型（或者说不想添加对应的实体类），这时候可以用匿名对象解析方法DeserializeAnonymousType()，方便快捷，对应代码如下：
1 //匿名对象解析 2 var tempEntity = new { ID = 0, Name = string.Empty }; 3 string json5 = JsonHelper.SerializeObject(tempEntity); 4 //json5 : {"ID":0,"Name":""} 5 tempEntity = JsonHelper.DeserializeAnonymousType("{"ID":"112","Name":"石子儿"}", tempEntity); 6 Console.WriteLine(tempEntity.ID + ":" + tempEntity.Name);
2. Json的两种结构数组和对象解析时略有不同。Json对象一般转换成实体，Json数组一般转换成实体集合。代码如下：
1 //验证对象和数组 2 Student sdudent4 = JsonHelper.DeserializeJsonToObject<Student>("{"ID":"112","Name":"石子儿"}"); 3 List<Student> sdudentList4 = JsonHelper.DeserializeJsonToList<Student>("[{"ID":"112","Name":"石子儿"}]");
简单解释下Json对象和数组的含义：
对象是以“{”（左括号）开始，“}”（右括号）结束。每个“名称”后跟一个“:”（冒号）；“‘名称/值’ 对”之间运用 “,”（逗号）分隔。名称用引号括起来；值如果是字符串则必须用括号，数值型则不须要。例如：{"ID":"112","Name":"石子儿"}。
数组是值（value）的有序集合。一个数组以“[”（左中括号）开始，“]”（右中括号）结束。值之间运用 “,”（逗号）分隔。例如：[{"ID":"112","Name":"石子儿"},{"ID":"113","Name":"陈晨"}]。
备注： //JavaScriptArray---> JArray
//JavaScriptConvert--->JsonConvert
//JavaScriptObject--->JObject
资源下载：Json90r1