LIOT/EMIS.Utility/JsonHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

using System.Web.Script.Serialization;
using System.IO;
using System.Runtime.Serialization;
using System.Reflection;
using System.Text.RegularExpressions;
namespace EMIS.Utility
{
    public class JsonHelper
    {
        //对应JSON的singleInfo成员
        public string singleInfo = string.Empty;

        protected string _error = string.Empty;
        protected bool _success = true;
        protected long _totalCount = 0;
        protected System.Collections.ArrayList arrData = new ArrayList();
        protected System.Collections.ArrayList arrDataItem = new ArrayList();

        public JsonHelper()
        {

        }

        public static string ToJSON(object obj)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            var json = serializer.Serialize(obj);
            string pattern = @"\\/Date\((\d+)\)\\/";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
            Regex reg = new Regex(pattern);
            return  reg.Replace(json, matchEvaluator); 
        }

        /// <summary>
        /// 将Json序列化的时间由/Date(1304931520336+0800)/转为字符串
        /// </summary>
        private static string ConvertJsonDateToDateString(System.Text.RegularExpressions.Match m)
        {
            string result = string.Empty;
            DateTime dt = new DateTime(1970, 1, 1);
            dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));
            dt = dt.ToLocalTime();
            result = dt.ToString("yyyy-MM-dd HH:mm:ss");
            return result;
        }

        public static string ToJSON(object obj, int recursionDepth)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            serializer.RecursionLimit = recursionDepth;
            return serializer.Serialize(obj);
        }

        public static T Deserialize<T>(object obj)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            return serializer.Deserialize<T>(obj.ToString());
        }

        public static string ToJsonByValueType(object obj)
        {
            ArrayList items = new ArrayList();
            PropertyInfo[] properties = obj.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);
            foreach (PropertyInfo p in properties)
            {
                if (p.PropertyType.IsValueType || p.PropertyType.Name.StartsWith("String"))
                {
                    var value = p.GetValue(obj, null);
                    if (value != null)
                    {
                        if (p.PropertyType.Name.StartsWith("String"))
                            value = System.Web.HttpContext.Current.Server.UrlEncode(value.ToString());
                        items.Add(string.Format("{0}:\"{1}\"", p.Name, value));
                    }
                }
            }
            return string.Format("{{{0}}}", string.Join(",", items.ToArray()));
        }

        //对应于JSON的success成员
        public bool success
        {
            get
            {
                return _success;
            }
            set
            {
                //如设置为true则清空error
                if (success) _error = string.Empty;
                _success = value;
            }
        }

        //对应于JSON的error成员
        public string error
        {
            get
            {
                return _error;
            }
            set
            {
                //如设置error，则自动设置success为false
                if (value != "") _success = false;
                _error = value;
            }
        }

        public long totlalCount
        {
            get { return _totalCount; }
            set { _totalCount = value; }
        }


        //重置，每次新生成一个json对象时必须执行该方法
        public void Reset()
        {
            _success = true;
            _error = string.Empty;
            singleInfo = string.Empty;
            arrData.Clear();
            arrDataItem.Clear();
        }

        public void AddItem(string name, string value)
        {
            arrData.Add(name + ":\"" + value + "\"");
        }
        public void AddItem(string name)
        {
            arrData.Add(name);
        }
        public void AddItem2(string name, string value)
        {
            arrData.Add(name + ":" + value);
        }
        public void ItemOk()
        {
            arrData.Add("<BR>");
        }
        public void AddItemChildren(string name, string value)
        {
            arrData.Add(name + ":'" + value + "'");
        }
        //序列化JSON对象，得到返回的JSON代码
        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            //sb.Append("{");
            //sb.Append("totalCount:" + totlalCount.ToString() + ",");
            //sb.Append("success:" + _success.ToString().ToLower() + ",");
            //sb.Append("error:\"" + _error.Replace("\"", "\\\"") + "\",");
            //sb.Append("singleInfo:\"" + singleInfo.Replace("\"", "\\\"") + "\",");
            // sb.Append("data:[");
            sb.Append("[");

            int index = 0;
            sb.Append("{");
            if (arrData.Count <= 0)
            {
                sb.Append("}]");
            }
            else
            {
                foreach (string val in arrData)
                {
                    index++;

                    if (val != "<BR>")
                    {
                        sb.Append(val + ",");
                    }
                    else
                    {
                        sb = sb.Replace(",", "", sb.Length - 1, 1);
                        sb.Append("},");
                        if (index < arrData.Count)
                        {
                            sb.Append("{");
                        }
                    }

                }
                sb = sb.Replace(",", "", sb.Length - 1, 1);
                sb.Append("]");
            }

            //sb.Append("}");
            return sb.ToString();
        }

        //序列化JSON对象，得到返回的JSON代码      //返回子頁的JSON數據
        public string ChildrenToString(string strtmp)
        {
            return "children:" + strtmp;
        }

   
    }
}