using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.IO;
using Common.TextUtil;
using System.Reflection;
using Common.Exceptions;

namespace NSC
{
    /// <summary>
    /// 功能：基于网络流传输的数据转换器
    /// 作者：王昊昇
    /// 时间：2012.11.8
    /// </summary>
    internal static class NetDataConverter
    {
        /// <summary>
        /// 将字节数组转换为数据表
        /// </summary>
        /// <param name="data">字节数组</param>
        /// <returns>数据表</returns>
        internal static DataTable ByteArrayToDataTable(byte[] data)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                ms.Write(data, 0, data.Length);

                ms.Position = 0;

                System.Xml.XmlTextWriter xtw = new System.Xml.XmlTextWriter(ms, Encoding.GetEncoding("gb2312"));
                xtw.WriteStartDocument();

                //创建xml读取器
                System.Xml.XmlTextReader xtr = new System.Xml.XmlTextReader(ms);

                //创建数据集合
                using (DataSet ds = new DataSet())
                {
                    //将xml数据读入数据集合
                    ds.ReadXml(xtr, XmlReadMode.ReadSchema);

                    //返回数据集合
                    return ds.Tables[0].Copy();
                }
            }
        }

        /// <summary>
        /// 将字节数组转换为数据表集合
        /// </summary>
        /// <param name="data">字节数组</param>
        /// <returns>数据表集合</returns>
        internal static DataSet ByteArrayToDataSet(byte[] data)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                ms.Write(data, 0, data.Length);

                ms.Position = 0;

                System.Xml.XmlTextWriter xtw = new System.Xml.XmlTextWriter(ms, Encoding.GetEncoding("gb2312"));
                xtw.WriteStartDocument();

                //创建xml读取器
                System.Xml.XmlTextReader xtr = new System.Xml.XmlTextReader(ms);

                //创建数据集合
                DataSet ds = new DataSet();

                //将xml数据读入数据集合
                ds.ReadXml(xtr, XmlReadMode.ReadSchema);

                //返回数据集合
                return ds;
            }
        }

        /// <summary>
        /// 将字节数组转换为数据表集合
        /// </summary>
        /// <param name="ms">内存流</param>
        /// <returns>数据表集合</returns>
        internal static DataSet MemoryStreamToDataSet(MemoryStream ms)
        {
            ms.Position = 0;

            System.Xml.XmlTextWriter xtw = new System.Xml.XmlTextWriter(ms, Encoding.GetEncoding("gb2312"));
            xtw.WriteStartDocument();

            //创建xml读取器
            System.Xml.XmlTextReader xtr = new System.Xml.XmlTextReader(ms);

            //创建数据集合
            DataSet ds = new DataSet();

            //将xml数据读入数据集合
            ds.ReadXml(xtr, XmlReadMode.ReadSchema);

            //返回数据集合
            return ds;
        }

        /// <summary>
        /// 将数据表转换为字节数组
        /// </summary>
        /// <param name="table">数据表</param>
        /// <returns>字节数组</returns>
        internal static byte[] DataTableToByteArray(DataTable table)
        {
            using (DataSet ds = new DataSet())
            {
                ds.Tables.Add(table.Copy());

                //创建内存流
                using (MemoryStream ms = new MemoryStream())
                {
                    //将数据以xml方式写入流
                    ds.WriteXml(ms, XmlWriteMode.WriteSchema);

                    //返回字节数组
                    return ms.ToArray();
                }
            }
        }

        /// <summary>
        /// 将数据表集合转换为字节数组
        /// </summary>
        /// <param name="dataSet">数据表集合</param>
        /// <returns>字节数组</returns>
        internal static byte[] DataSetToByteArray(DataSet dataSet)
        {
            //创建内存流
            using (MemoryStream ms = new MemoryStream())
            {
                //将数据以xml方式写入流
                dataSet.WriteXml(ms, XmlWriteMode.WriteSchema);

                //返回字节数组
                return ms.ToArray();
            }
        }
    }
}