<?xml version="1.0" encoding="utf-8"?>
<config>
  <Header ID="ID" class="class" class_name="class_name" year="year" school="school" count="count">
  </Header>
  <rows ID="01" class="一五班" class_name="实验班" year="2013" school="三峡高级中学" count="30">
  </rows>
  <rows ID="02" class="一六班" class_name="奥数班" year="2013" school="三峡高级中学" count="45">
  </rows>
  <rows ID="03" class="一七班" class_name="阳光班" year="2013" school="三峡高级中学" count="60">
  </rows>
  <rows ID="04" class="一八班" class_name="美术班" year="2013" school="三峡高级中学" count="75">
  </rows>
</config>

   /// <summary>
        /// 修改XML
        /// </summary>
        /// <param name="xmlName">XML文件名</param>
        /// <param name="ht">存放信息哈希表</param>
        /// <param name="ID">主键值</param>
        public void saveXML(string xmlName,Hashtable ht,string ID)
        {
            string fileName=HttpContext.Current.Request.PhysicalApplicationPath+"\\Xml\\"+xmlName+".xml";//xml的物理路径
            XmlDocument xmlDoc=new XmlDocument ();
            xmlDoc.Load(fileName);
            XmlNode node = xmlDoc.SelectSingleNode("config/rows[@ID=" + ID + "]");
            foreach (XmlNode node1 in node.Attributes)
            {
                if (ht.ContainsKey(node1.Name)&&node1.Name!="ID")
                {
                    node1.Value = ht[node1.Name].ToString();
                }
            }
            xmlDoc.Save(fileName);
        }

  Hashtable ht = new Hashtable();
        ht.Add("ID", this.txt_ID.Value);
        ht.Add("class", this.txt_class.Value);
        ht.Add("class_name", this.txt_class_name.Value);
        ht.Add("year", this.txt_year.Value);
        ht.Add("school", this.txt_school.Value);
        ht.Add("count", this.txt_count.Value);

    /// <summary>
        /// 插入xml
        /// </summary>
        /// <param name="xmlName">XML文件名</param>
        /// <param name="ht">存放信息哈希表</param>
        /// <returns></returns>
        public string insertXml(string xmlName, Hashtable ht)
        {
            string fileName = HttpContext.Current.Request.PhysicalApplicationPath + "\\Xml\\" + xmlName + ".xml";//xml的物理路径
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(fileName);
            XmlNode node = xmlDoc.SelectSingleNode("//rows[last()]");//最后一个行节点
            XmlNode MaxNode = xmlDoc.SelectSingleNode("//rows/@ID[not(.<//rows/@ID)]");//获取主键最大值
            if (int.Parse(ht[MaxNode.Name].ToString()) <= int.Parse(MaxNode.Value))//如果小于主键最大值，那么返回-
            {
                return "-1";
            }
            XmlElement xe = xmlDoc.CreateElement("rows");
            xe.InnerText = "";
            foreach (XmlNode node1 in node.Attributes)
            {
                if (ht.ContainsKey(node1.Name))
                {
                    xe.SetAttribute(node1.Name, ht[node1.Name].ToString());
                }
                else
                {
                    xe.SetAttribute(node1.Name,"");
                }
            }
            node.ParentNode.AppendChild(xe);
            xmlDoc.Save(fileName);
            return "1";
        }

   /// <summary>
        /// 删除xml节点
        /// </summary>
        /// <param name="xmlName">XML文件名</param>
        /// <param name="ID">主键值</param>
        /// <param name="primaryKey">主键名</param>
        /// <returns></returns>
        public string deleteXml(string xmlName,string ID,string primaryKey)
        {
            string rtn = string.Empty;
            string fileName = HttpContext.Current.Request.PhysicalApplicationPath + "\\Xml\\" + xmlName + ".xml";//xml的物理路径
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(fileName);
            XmlNode node = xmlDoc.SelectSingleNode("//rows[@"+primaryKey+"=&#39;"+ID+"&#39;]");//最后一个行节点
            if (node ==null)
            {
                rtn = "-1";
            }
            else
            {
                node.ParentNode.RemoveChild(node);
                rtn = "1";
            }
            xmlDoc.Save(fileName);
            return rtn;
        }