实体和json互转

1.实体转Json

需要添加引用：System.ServiceModel.Web 和 System.Runtime.Serialization，然后使用Using：

  /// <summary>
        /// 获取将实体类转换为json数据（目的是为了更快在网页上传递数据）
        /// </summary>
        /// <returns></returns>
        public string GetJsonInfo(DatasModel dm)
        {
            //将对象序列化json
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(DatasModel));
            //创建存储区为内存流
            System.IO.MemoryStream ms = new MemoryStream();
            //将json字符串写入内存流中
            serializer.WriteObject(ms, dm);
            System.IO.StreamReader reader = new StreamReader(ms);
            ms.Position = 0;
            string strRes = reader.ReadToEnd();
            reader.Close();
            ms.Close();
            return strRes;
        }

2.json转实体

（ExtractModel为测试实体）

public static ExtractModel DeserializeJsonToObjectss<ExtractModel>(string json) where ExtractModel : class
{
    try
    {
        JsonSerializer serializer = new JsonSerializer();
        StringReader sr = new StringReader(json);
        object o = serializer.Deserialize(new JsonTextReader(sr), typeof(ExtractModel));


        ExtractModel t = o as ExtractModel;
        return t;
    }
    catch (Exception ex)
    {
        return null;
    }