XML操作类

using System;
using System.Xml;
using System.Data;

namespace XmlClass
    {
        /// <summary>
        /// XML相关通用功能
        /// </summary>
        public class XmlHelper
        {
            public XmlHelper() { }

            /// <summary>
            /// XML资源类型
            /// </summary>
            public enum XmlType
            {
                File,
                String
            };

            #region 读取XML资源到DataSet中
            /// <summary>
            /// 读取XML资源到DataSet中
            /// </summary>
            /// <param name="source">XML资源，文件为路径，否则为XML字符串</param>
            /// <param name="xmlType">XML资源类型</param>
            /// <returns>DataSet</returns>
            public static DataSet GetDataSet(string source, XmlType xmlType)
            {
                DataSet ds = new DataSet();
                if (xmlType == XmlType.File)
                {
                    ds.ReadXml(source);
                }
                else
                {
                    XmlDocument xd = new XmlDocument();
                    xd.LoadXml(source);
                    XmlNodeReader xnr = new XmlNodeReader(xd);
                    ds.ReadXml(xnr);
                }
                return ds;
            }

            #endregion

            #region 获取一个字符串xml文档中的ds
            /// <summary>
            /// 获取一个字符串xml文档中的ds
            /// </summary>
            /// <param name="xml_string">含有xml信息的字符串</param>
            public static void get_XmlValue_ds(string xml_string, ref DataSet ds)
            {
                System.Xml.XmlDocument xd = new XmlDocument();
                xd.LoadXml(xml_string);
                XmlNodeReader xnr = new XmlNodeReader(xd);
                ds.ReadXml(xnr);
                xnr.Close();
                int a = ds.Tables.Count;
            }
            #endregion

            #region 读取XML资源到DataTable中
            /// <summary>
            /// 读取XML资源到DataTable中
            /// </summary>
            /// <param name="source">XML资源，文件为路径，否则为XML字符串</param>
            /// <param name="xmlType">XML资源类型：文件，字符串</param>
            /// <param name="tableName">表名称</param>
            /// <returns>DataTable</returns>
            public static DataTable GetTable(string source, XmlType xmlType, string tableName)
            {
                DataSet ds = new DataSet();
                if (xmlType == XmlType.File)
                {
                    ds.ReadXml(source);
                }
                else
                {
                    XmlDocument xd = new XmlDocument();
                &nb

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