将对象序列化为javaScript 对象表示法 (JSON)，并将 JSON 数据反序列化为对象。 此类不能继承。
//msdn 例子:
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namespace SL_DataContractJsonSerializer { public partial class Page : UserControl { public Page() { InitializeComponent(); } //This uses an event handler, not SL data binding void OnClick(object sender, EventArgs args) { txtOutput1.Text = "Create a User object and serialize it."; string json = WriteFromObject(); txtOutput2.Text = json.ToString(); // Displays: {"Age":42,"Name":"Bob"} txtOutput3.Text = "Deserialize the data to a User object."; string jsonString = "{'Name':'Bill', 'Age':53}"; User deserializedUser = ReadToObject(jsonString); txtOutput4.Text = deserializedUser.Name; // Displays: Bill txtOutput5.Text = deserializedUser.Age.ToString(); // Displays: 53 } // Create a User object and serialize it to a JSON stream. public static string WriteFromObject() { //Create User object. User user = new User("Bob", 42); //Create a stream to serialize the object to. MemoryStream ms = new MemoryStream(); // Serializer the User object to the stream. DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(User)); ser.WriteObject(ms, user); byte[] json = ms.ToArray(); ms.Close(); return Encoding.UTF8.GetString(json, 0, json.Length); } // Deserialize a JSON stream to a User object. public static User ReadToObject(string json) { User deserializedUser = new User(); MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)); DataContractJsonSerializer ser = new DataContractJsonSerializer(deserializedUser.GetType()); deserializedUser = ser.ReadObject(ms) as User; ms.Close(); return deserializedUser; } } [DataContract] public class User { [DataMember] public string Name { get; set; } [DataMember] public int Age { get; set; } public User() { } public User(string newName, int newAge) { Name = newName; Age = newAge; } } }
可以抽象成如下类:
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public class JsonHelper { /// <summary> /// 生成Json格式 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="obj"></param> /// <returns></returns> public static string GetJson<T>(T obj) { DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType()); using (MemoryStream stream = new MemoryStream()) { json.WriteObject(stream, obj); string szJson = Encoding.UTF8.GetString(stream.ToArray()); return szJson; } } /// <summary> /// 获取Json的Model /// </summary> /// <typeparam name="T"></typeparam> /// <param name="szJson"></param> /// <returns></returns> public static T ParseFromJson<T>(string szJson) { T obj = Activator.CreateInstance<T>(); using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson))) { DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType()); return (T)serializer.ReadObject(ms); } } }
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/// <summary> /// 反回JSON数据到前台 /// </summary> /// <param name="dt">数据表</param> /// <returns>JSON字符串</returns> public string DataTableToJson(DataTable dt) { StringBuilder JsonString = new StringBuilder(); if (dt != null && dt.Rows.Count > 0) { JsonString.Append("{ "); JsonString.Append("\"TableInfo\":[ "); for (int i = 0; i < dt.Rows.Count; i++) { JsonString.Append("{ "); for (int j = 0; j < dt.Columns.Count; j++) { if (j < dt.Columns.Count - 1) { JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\","); } else if (j == dt.Columns.Count - 1) { JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\""); } } if (i == dt.Rows.Count - 1) { JsonString.Append("} "); } else { JsonString.Append("}, "); } } JsonString.Append("]}"); return JsonString.ToString(); } else { return null; } }
//还有一种方式操作json类型数据:
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public static class JsonTableHelper { /// <summary> /// 返回对象序列化 /// </summary> /// <param name="obj">源对象</param> /// <returns>json数据</returns> public static string ToJson(this object obj) { JavascriptSerializer serialize = new JavaScriptSerializer(); return serialize.Serialize(obj); } /// <summary> /// 控制深度 /// </summary> /// <param name="obj">源对象</param> /// <param name="recursionDepth">深度</param> /// <returns>json数据</returns> public static string ToJson(this object obj, int recursionDepth) { JavaScriptSerializer serialize = new JavaScriptSerializer(); serialize.RecursionLimit = recursionDepth; return serialize.Serialize(obj); } /// <summary> /// DataTable转为json /// </summary> /// <param name="dt">DataTable</param> /// <returns>json数据</returns> public static string ToJson(DataTable dt) { Dictionary<string, object> dic = new Dictionary<string, object>(); int index = 0; foreach (DataRow dr in dt.Rows) { Dictionary<string, object> result = new Dictionary<string, object>(); foreach (DataColumn dc in dt.Columns) { result.Add(dc.ColumnName, dr[dc].ToString()); } dic.Add(index.ToString(), result); index++; } return ToJson(dic); } }