using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;


namespace CB.Common
{
    /// <summary>
    /// json操作类
    /// </summary>
    public class JSONUtil
    {
        /// <summary>
        /// 列表到json
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonName"></param>
        /// <param name="IL"></param>
        /// <returns></returns>
        public static string ObjectToJson<T>(IList<T> IL)
        {
            StringBuilder Json = new StringBuilder();
            Json.Append("[");
            if (IL.Count > 0)
            {
                for (int i = 0; i < IL.Count; i++)
                {
                    T obj = Activator.CreateInstance<T>();
                    Type type = obj.GetType();
                    PropertyInfo[] pis = type.GetProperties();
                    Json.Append("{");
                    for (int j = 0; j < pis.Length; j++)
                    {
                        Json.Append("\"" + pis[j].Name.ToString() + "\":\"" + pis[j].GetValue(IL[i], null) + "\"");
                        if (j < pis.Length - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < IL.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]");
            return Json.ToString();
        }


        public static string GetJSON<T>(T t)
        {
            string result = String.Empty;
            try
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =
                   new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));
                using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
                {
                    serializer.WriteObject(ms, t);
                    result = System.Text.Encoding.UTF8.GetString(ms.ToArray());
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return result;
        }


        /// <summary>  
        /// 把json还原为对象  
        /// </summary>  
        /// <typeparam name="T">对象类型</typeparam>  
        /// <param name="jsonStr">json字符串</param>  
        /// <returns>T 对象类型</returns>  
        public static T ParseFormByJson<T>(string jsonStr)
        {
            T obj = Activator.CreateInstance<T>();
            using (System.IO.MemoryStream ms =
                new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(jsonStr)))
            {
                System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =
                    new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));
                return (T)serializer.ReadObject(ms);
            }
        }
    }
}