关于XML文档操作类

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Xml;
  6 
  7 namespace ZW.ClassLibrary
  8 {
  9    public class XmlHelpers
 10     {
 11        /// <summary>
 12        /// XML文档
 13        /// </summary>
 14        XmlDocument xd = new XmlDocument();
 15 
 16        /// <summary>
 17        /// 从文件中获取XmlDocument对象
 18        /// </summary>
 19        /// <param name="file">xml文档</param>
 20        /// <param name="type">文档类型</param>
 21        public XmlHelpers(string file, string type)
 22        {
 23            if (type == "path")
 24            {
 25                XmlTextReader xr = new XmlTextReader(file);
 26                xd.Load(xr);
 27                xr.Close();
 28            }
 29 
 30            if (type == "text")
 31            {
 32                xd.LoadXml(file);
 33            }
 34        }
 35 
 36        /// <summary>
 37        /// 获取第一个匹配节点的属性值
 38        /// </summary>
 39        /// <param name="nodePath"></param>
 40        /// <param name="attrName"></param>
 41        /// <returns></returns>
 42        public string GetAttribute(string nodePath, string attrName)
 43        {
 44            XmlNode xn = xd.SelectSingleNode(nodePath);
 45            if (xn == null) //检测节点是否存在
 46            {
 47                return "";
 48            }
 49            if (xn.Attributes[attrName] == null) //检测属性是否存在
 50            {
 51                return "";
 52            }
 53 
 54            return xn.Attributes[attrName].Value;
 55        }
 56 
 57        /// <summary>
 58        /// 获取某个节点
 59        /// </summary>
 60        /// <param name="nodePath"></param>
 61        /// <returns></returns>
 62        public XmlNode GetNode(string nodePath)
 63        {
 64            XmlNode xn = xd.SelectSingleNode(nodePath);
 65            return xn;
 66        }
 67 
 68        /// <summary>
 69        /// 获取某个节点子集合指定属性值的节点
 70        /// </summary>
 71        /// <param name="nodePath">父节点</param>
 72        /// <returns></returns>
 73        public XmlNode GetNode(string nodePath, string attrName, string attrValue)
 74        {
 75            XmlNodeList xl = GetChildNode(nodePath);
 76            if (xl != null)
 77            {
 78                foreach (XmlNode node in xl)
 79                {
 80                    if (node.Attributes[attrName] != null) //检测属性是否存在
 81                    {
 82                        if (node.Attributes[attrName].Value.Trim() == attrValue)
 83                        {
 84                            return node;
 85                        }
 86                    }
 87                }
 88            }
 89            return null;
 90        }
 91 
 92        /// <summary>
 93        /// 获取某个节点上的子节点
 94        /// </summary>
 95        /// <param name="nodePath"></param>
 96        /// <returns></returns>
 97        public XmlNodeList GetChildNode(string nodePath)
 98        {
 99            XmlNodeList xl = null;
100            XmlNode xn = xd.SelectSingleNode(nodePath);
101            if (xl != null)
102            {
103                xl = xd.ChildNodes;
104            }
105            return xl;
106        }
107     }
108 }