C#中讀取json數(shù)據(jù)

修行的嘟嘟 2011-07-11

展開全文

//先在項目中添加System.Web.Extensions引用
    
//using System.Web.Script.Serialization;
    
JavaScriptSerializer serializer = new JavaScriptSerializer();
    
Dictionary<string, object> json = (Dictionary<string, object>)serializer.DeserializeObject(
    
    "{name: 'zswang', forum: 'c#'}");
    
object value;
    
if (json.TryGetValue("name", out value))
    
    Console.WriteLine(value); // 輸出:zswang

System.Runtime.Serialization 是不夠的，還要添加 System.ServiceModel和System.ServiceModel.Web的引用System.Runtime.Serialization.Json 出來了，可以開始對JSON字符串轉(zhuǎn)為實體了。

/// <summary>
        /// Serialize T to string
        /// </summary>
        /// <param name="item"></param>
        /// <returns></returns>
        public static string Serialize<T>(T item)
        {
            if (item == null) return string.Empty;

            var serializer = new DataContractJsonSerializer(item.GetType());

            using (var ms = new MemoryStream())
            {
                serializer.WriteObject(ms, item);

                var sb = new StringBuilder();
                sb.Append(Encoding.UTF8.GetString(ms.ToArray()));

                return sb.ToString();
            }
        }

        /// <summary>
        /// Deserialize string back to T
        /// </summary>
        /// <param name="jsonString"></param>
        /// <returns></returns>
        public static T Deserialize<T>(string jsonString)
        {
            if (string.IsNullOrEmpty(jsonString)) return default(T);

            var ser = new DataContractJsonSerializer(typeof(T));

            using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
            {
                T jsonObject = (T)ser.ReadObject(ms);
                return jsonObject;
            }
        }

Json序列化和反序列化方法

引用空間System.Runtime.Serialization和System.Runtime.Serialization.Json

publicstaticstring ToJsJson(thisobject item)
        {

            DataContractJsonSerializer serializer =new DataContractJsonSerializer(item.GetType());

using (MemoryStream ms =new MemoryStream())
            {

                serializer.WriteObject(ms, item);

                StringBuilder sb =new StringBuilder();

                sb.Append(Encoding.UTF8.GetString(ms.ToArray()));

return sb.ToString();

            }

        }

///<summary>
//////</summary>
publicstatic T FromJsonTo<T>(thisstring jsonString)
        {

            DataContractJsonSerializer ser =new DataContractJsonSerializer(typeof(T));

            MemoryStream ms =new MemoryStream(Encoding.UTF8.GetBytes(jsonString));

            T jsonObject = (T)ser.ReadObject(ms);

            ms.Close();

return 實體類

}