效果

格式化前的字串：

{id=11,name="xxj",age=111,time=DateTime.Now};

格式化後的字串：
{
  id=11,
  name="xxj",
  age=111,
  time='2010-1-1 1:1:1'
};

需要1：Newtonsoft.Json.dll 元件

需要2：自定義擴充套件方法

        /// <summary>
        /// 生成Json格式
        /// key=欄位名，value=欄位值
        /// </summary>
        /// <typeparam name="T">待序列化的物件</typeparam>
        /// <returns></returns>
        /// <remarks>建立人員(日期):★xxj★(111026 19:08)</remarks>
        public static string ToJsonSerialize<T>(this T obj) //where T : class
        {
            if (obj.IsNullOrDbNull())
                return string.Empty;

            if (obj is DataTable)
                return DataTableToJson(obj as DataTable);

            JavaScriptSerializer serialize = new JavaScriptSerializer();
            //針對日期序列化時區的轉化
            var json = Regex.Replace(serialize.Serialize(obj), @"\\/Date\((-?\d+)\)\\/", match =>
            {
                var dt = new DateTime(1970, 1, 1);
                dt = dt.AddMilliseconds(long.Parse(match.Groups[1].Value));
                dt = dt.ToLocalTime();
                return dt.ToString("yyyy-MM-dd HH:mm:ss");
            });
            return json;
        }
 

    /// <summary>
    /// 測試json字串格式化
    /// </summary>
    [TestMethod]
    public void TestJsonFormat()
    {
        //格式化json字串
        var data = new
        {
            id=11,
            name="xxj",
            age=111,
            time=DateTime.Now
        };
        var json = data.ToJsonSerialize();
        //Newtonsoft.Json.dll, v4.5.0.0
        JsonSerializer serializer = new JsonSerializer();
        TextReader tr = new StringReader(json);
        JsonTextReader jtr = new JsonTextReader(tr);
        object obj = serializer.Deserialize(jtr);
        if (obj != null)
        {
            StringWriter textWriter = new StringWriter();
            JsonTextWriter jsonWriter = new JsonTextWriter(textWriter)
            {
                Formatting = Formatting.Indented,
                Indentation = 4,
                IndentChar = ' '
            };
            serializer.Serialize(jsonWriter, obj);
            var jsonF = textWriter.ToString();
        }


        Assert.IsTrue(true);
    }