using System;
using System.Data;
using System.IO;
using System.Web;
using System.Xml;
using IwbZero.ToolCommon.LogHelpers;

namespace IwbZero.ToolCommon.FileHelpers
{
    /// <summary>
    /// XML形式的字符串、XML文江转换成DataSet、DataTable格式
    /// </summary>
    public static class XmlToData
    {
        /**//// <summary>
        /// 将Xml内容字符串转换成DataSet对象
        /// </summary>
        /// <param name="xmlStr">Xml内容字符串</param>
        /// <returns>DataSet对象</returns>
        public static DataSet CXmlToDataSet(this string xmlStr)
        {
            if (!string.IsNullOrEmpty(xmlStr))
            {
                StringReader StrStream = null;
                XmlTextReader Xmlns = null;
                try
                {
                    DataSet ds = new DataSet();
                    //读取字符串中的信息
                    StrStream = new StringReader(xmlStr);
                    //获取StrStream中的数据
                    Xmlns = new XmlTextReader(StrStream);
                    //ds获取Xmlns中的数据               
                    ds.ReadXml(Xmlns);
                    return ds;
                }
                catch (Exception e)
                {
                    typeof(XmlToData).LogError(e);
                }
                finally
                {
                    //释放资源
                    if (Xmlns != null)
                    {
                        Xmlns.Close();
                        StrStream.Close();
                        StrStream.Dispose();
                    }
                }
            }
            return null;
        }
        /**//// <summary>
        /// 将Xml字符串转换成DataTable对象
        /// </summary>
        /// <param name="xmlStr">Xml字符串</param>
        /// <param name="tableIndex">Table表索引</param>
        /// <returns>DataTable对象</returns>
        public static DataTable CXmlToDataTable(this string xmlStr, int tableIndex)
        {
            return CXmlToDataSet(xmlStr).Tables[tableIndex];
        }
        /**//// <summary>
        /// 将Xml字符串转换成DataTable对象
        /// </summary>
        /// <param name="xmlStr">Xml字符串</param>
        /// <returns>DataTable对象</returns>
        public static DataTable CXmlToDataTable(this string xmlStr)
        {
            return CXmlToDataSet(xmlStr).Tables[0];
        }
        /**//// <summary>
        /// 读取Xml文件信息,并转换成DataSet对象
        /// </summary>
        /// <remarks>
        /// DataSet ds = new DataSet();
        /// ds = CXmlFileToDataSet("/XML/upload.xml");
        /// </remarks>
        /// <param name="xmlFilePath">Xml文件地址</param>
        /// <returns>DataSet对象</returns>
        public static DataSet CXmlFileToDataSet(this string xmlFilePath)
        {
            if (!string.IsNullOrEmpty(xmlFilePath))
            {
                string path = HttpContext.Current.Server.MapPath(xmlFilePath);
                StringReader StrStream = null;
                XmlTextReader Xmlns = null;
                try
                {
                    XmlDocument xmlDoc = new XmlDocument();
                    //根据地址加载Xml文件
                    xmlDoc.Load(path);

                    DataSet ds = new DataSet();
                    //读取文件中的字符流
                    StrStream = new StringReader(xmlDoc.InnerXml);
                    //获取StrStream中的数据
                    Xmlns = new XmlTextReader(StrStream);
                    //ds获取Xmlns中的数据
                    ds.ReadXml(Xmlns);
                    return ds;
                }
                catch (Exception e)
                {
                    typeof(XmlToData).LogError(e);
                }
                finally
                {
                    //释放资源
                    if (Xmlns != null)
                    {
                        Xmlns.Close();
                        StrStream.Close();
                        StrStream.Dispose();
                    }
                }
            }
            return null;
        }
        /**//// <summary>
        /// 读取Xml文件信息,并转换成DataTable对象
        /// </summary>
        /// <param name="xmlFilePath">xml文江路径</param>
        /// <param name="tableIndex">Table索引</param>
        /// <returns>DataTable对象</returns>
        public static DataTable CXmlFileToDataTable(this string xmlFilePath, int tableIndex)
        {
            return CXmlFileToDataSet(xmlFilePath).Tables[tableIndex];
        }
        /**//// <summary>
        /// 读取Xml文件信息,并转换成DataTable对象
        /// </summary>
        /// <param name="xmlFilePath">xml文江路径</param>
        /// <returns>DataTable对象</returns>
        public static DataTable CXmlFileToDataTable(this string xmlFilePath)
        {
            return CXmlFileToDataSet(xmlFilePath).Tables[0];
        }
    }
}