利用Newtonsoft.Json实现Json序列化与反序列化

在项目中用到了Newtonsoft.Json来实现序列化和反序列化，在这里写下实现代码。

1、创建类用于排除不序列化的属性

public class ExcludePRopertiesContractResolver : DefaultContractResolver    {        IEnumerable<string> lstExclude;        public ExcludePropertiesContractResolver(IEnumerable<string> excludedProperties)        {            lstExclude = excludedProperties;        }        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)        {            return base.CreateProperties(type, memberSerialization).ToList().FindAll(p => !lstExclude.Contains(p.PropertyName));        }    }

2、序列化方法

以下分别是将对象、DataTable、集合序列化为Json字符串的方法：

        /// <summary>        /// T对象转换成json字符串        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="obj"></param>        /// <returns></returns>        public static string GetJsonString<T>(T obj, params string[] ignoreFields)        {            IsoDateTimeConverter iso = new IsoDateTimeConverter();            iso.DateTimeFormat = "yyyy-MM-ddTHH:mm:ss";            iso.DateTimeStyles = System.Globalization.DateTimeStyles.AssumeLocal;            string jsonStr = string.Empty;            JsonSerializerSettings js = new JsonSerializerSettings();            if (ignoreFields != null && ignoreFields.Length > 0)            {                List<string> ignoreList = ignoreFields.ToList();                js.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;                js.ContractResolver = new ExcludePropertiesContractResolver(ignoreList);            }            js.Converters.Add(iso);            jsonStr = JsonConvert.SerializeObject(obj, Formatting.Indented, js);            return jsonStr;        }        /// <summary>        /// DataTable对象转换成json字符串        /// </summary>        /// <param name="dt"></param>        /// <returns></returns>        public static string GetJsonString(DataTable dt, params string[] ignoreFields)        {            IsoDateTimeConverter iso = new IsoDateTimeConverter();            iso.DateTimeFormat = "yyyy-MM-ddTHH:mm:ss";            iso.DateTimeStyles = System.Globalization.DateTimeStyles.AssumeLocal;            string jsonStr = string.Empty;            JsonSerializerSettings js = new JsonSerializerSettings();            if (ignoreFields != null && ignoreFields.Length > 0)            {                List<string> ignoreList = ignoreFields.ToList();                js.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;                js.ContractResolver = new ExcludePropertiesContractResolver(ignoreList);            }            js.Converters.Add(new DataTableConverter());            js.Converters.Add(iso);            jsonStr = JsonConvert.SerializeObject(dt, Formatting.Indented,js);            return jsonStr;        }        /// <summary>        /// List对象转换成json字符串        /// </summary>        /// <param name="dt"></param>        /// <returns></returns>        public static string GetJsonString<T>(List<T> list, params string[] ignoreFields)        {            IsoDateTimeConverter iso = new IsoDateTimeConverter();            iso.DateTimeFormat = "yyyy-MM-ddTHH:mm:ss";            iso.DateTimeStyles = System.Globalization.DateTimeStyles.AssumeLocal;            string jsonStr = string.Empty;            JsonSerializerSettings js = new JsonSerializerSettings();            if (ignoreFields != null && ignoreFields.Length > 0)            {                List<string> ignoreList = ignoreFields.ToList();                js.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;                js.ContractResolver = new ExcludePropertiesContractResolver(ignoreList);            }            js.Converters.Add(iso);            jsonStr = JsonConvert.SerializeObject(list, Formatting.Indented, js);            return jsonStr;        }

3、反序列化

以下是将Json字符串反序列化为对象、集合的方法。

        /// <summary>        /// json字符串转换成T对象        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="jsonStr"></param>        /// <returns></returns>        public static T GetObjectByJsonString<T>(string jsonStr)        {            T obj = JsonConvert.DeserializeObject<T>(jsonStr);            return obj;        }        /// <summary>        /// json字符串转换成List对象        /// </summary>        /// <typeparam name="T"></typeparam>        /// <param name="jsonStr"></param>        /// <returns></returns>        public static List<T> GetListByJsonString<T>(string jsonStr)        {            List<T> list = JsonConvert.DeserializeObject<List<T>>(jsonStr);            return list;        }