/*  作者：       季健国
*  创建时间：   2012/6/9 23:10:11
*
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Script.Serialization;
using Newtonsoft.Json;
using System.Xml;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Data;
using System.Collections;

namespace Ant.Service.Common
{

    /// <summary>
    /// 提供了一个关于json的辅助类
    /// </summary>
    public class JsonHelper
    {


        #region DataTable<-->JSON
        /// <summary> 
        /// DataTable转为json 
        /// </summary> 
        /// <param name="dt">DataTable</param> 
        /// <returns>json数据</returns> 
        public static string DataTableToJson(DataTable dt)
        {
            List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();
            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]);
                }
                list.Add(result);
            }

            return SerializeToJson(list);
        }
        /// <summary>
        /// 序列化对象为Json字符串
        /// </summary>
        /// <param name="obj">要序列化的对象</param>
        /// <param name="recursionLimit">序列化对象的深度，默认为100</param>
        /// <returns>Json字符串</returns>
        public static string SerializeToJson(object obj, int recursionLimit = 100)
        {
            try
            {
                JavaScriptSerializer serialize = new JavaScriptSerializer();
                serialize.RecursionLimit = recursionLimit;
                return serialize.Serialize(obj);
            }
            catch { return ""; }
        }
        /// <summary>
        /// json包转DataTable
        /// </summary>
        /// <param name="jsons"></param>
        /// <returns></returns>
        public static DataTable JsonToDataTable(string jsons)
        {
            DataTable dt = new DataTable();
            try
            {
                JavaScriptSerializer serialize = new JavaScriptSerializer();
                serialize.MaxJsonLength = Int32.MaxValue;
                ArrayList list = serialize.Deserialize<ArrayList>(jsons);
                if (list.Count > 0)
                {
                    foreach (Dictionary<string, object> item in list)
                    {
                        if (item.Keys.Count == 0)//无值返回空
                        {
                            return dt;
                        }
                        if (dt.Columns.Count == 0)//初始Columns
                        {
                            foreach (string current in item.Keys)
                            {
                                dt.Columns.Add(current, item[current].GetType());
                            }
                        }
                        DataRow dr = dt.NewRow();
                        foreach (string current in item.Keys)
                        {
                            dr[current] = item[current];
                        }
                        dt.Rows.Add(dr);
                    }
                }
            }
            catch
            {
                return dt;
            }
            return dt;
        }
        #endregion


        #region Method
        /// <summary>
        /// 类对像转换成json格式
        /// </summary> 
        /// <returns></returns>
        public static string ToJson(object t)
        {
          return JsonConvert.SerializeObject(t, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Include });
        }
        /// <summary>
        /// 类对像转换成json格式
        /// </summary>
        /// <param name="t"></param>
        /// <param name="HasNullIgnore">是否忽略NULL值</param>
        /// <returns></returns>
        public static string ToJson(object t, bool HasNullIgnore)
        {
            if (HasNullIgnore)
                return JsonConvert.SerializeObject(t, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
            else
                return ToJson(t);
        }
        /// <summary>
        /// json格式转换
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="strJson"></param>
        /// <returns></returns>
        public static T FromJson<T>(string strJson) where T : class
        {
            if (!strJson.IsNullOrEmpty())
                return JsonConvert.DeserializeObject<T>(strJson);
            return null;
        }
        /// <summary>
        /// 功能描述：将List转换为Json
        /// 创建标识：szj
        /// </summary>
        /// <param name="a"></param>
        /// <returns></returns>
        public static string ListToJson(IList<object> a)
        {

            DataContractJsonSerializer json = new DataContractJsonSerializer(a.GetType());
            string szJson = "";
            //序列化
            using (MemoryStream stream = new MemoryStream())
            {
                json.WriteObject(stream, a);
                szJson = Encoding.UTF8.GetString(stream.ToArray());
            }
            return szJson;
        }
        #endregion

        #region Property
        /// <summary>
        /// 数据状态
        /// </summary>
        public string Status { get; set; }
        /// <summary>
        /// 提示信息
        /// </summary>
        public string Msg { get; set; }
        /// <summary>
        /// 回传URL
        /// </summary>
        public string ReUrl { get; set; }
        /// <summary>
        /// 数据包
        /// </summary>
        public object Data { get; set; }
        #endregion

    }
}