XmlDocument 操作XML －－本文件是转载的。。在此感谢那位写文的前辈！

这是一篇不错的C#关于XmlDocument对象 关于操作XML文件的文件。本人从中受益非常！ 今与大家共享之。。。 读写XML文件        <?xml version="1.0" encoding="utf-8"?> <Employeers>   <Employeer ID="DBT39435M">     <HireDate>1/1/1990 12:00:00 上午</HireDate>     <JobLvl>75</JobLvl>     <JobID>11</JobID>     <LastName>Tonini</LastName>     <FirstName>Daniel</FirstName>   </Employeer> </Employeers> 以上是xml文件模板。

   /** <summary>         /// 写入xml文件         /// </summary>         /// <param name="fileName">完整文件名</param>         private void WriteXml(string fileName)         {             DataTable dt = DataAccess.AjaxData.GetXmlData();             XmlDocument xmldoc = new XmlDocument();             //创建文件头信息             XmlDeclaration xmldec = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);             //创建文件根节点             XmlElement rootNode = xmldoc.CreateElement("Employeers");             xmldoc.InsertBefore(xmldec, xmldoc.DocumentElement);             xmldoc.AppendChild(rootNode);

            //遍历数据表，             foreach (DataRow dr in dt.Rows)             {                 //创建一条记录的父节点                 XmlElement parentNode = xmldoc.CreateElement("Employeer");                 parentNode.SetAttribute("ID", dr["emp_id"].ToString());                 xmldoc.DocumentElement.PrependChild(parentNode);                 //为每个字段创建一个子节点                 XmlElement FName = xmldoc.CreateElement("FirstName");                 XmlElement LName = xmldoc.CreateElement("LastName");                 XmlElement JobID = xmldoc.CreateElement("JobID");                 XmlElement JobLvl = xmldoc.CreateElement("JobLvl");                 XmlElement HireDate = xmldoc.CreateElement("HireDate");                                 //创建子节点的文字描述                 XmlText fnametext = xmldoc.CreateTextNode(dr["fname"].ToString());                 XmlText lnametext = xmldoc.CreateTextNode(dr["lname"].ToString());                 XmlText jobidtext = xmldoc.CreateTextNode(dr["job_id"].ToString());                 XmlText joblvtextl = xmldoc.CreateTextNode(dr["job_lvl"].ToString());                 XmlText hiredatetext = xmldoc.CreateTextNode(dr["hire_date"].ToString());

                //将文字描述加到子节点                 FName.AppendChild(fnametext);                 LName.AppendChild(lnametext);                 JobID.AppendChild(jobidtext);                 JobLvl.AppendChild(joblvtextl);                 HireDate.AppendChild(hiredatetext);

                /**//*上面两段也可以通过这段来代替                 FName.InnerText = dr["fname"].ToString();                 LName.InnerText = dr["lname"].ToString();                 JobID.InnerText = dr["job_id"].ToString();                 JobLvl.InnerText = dr["job_lvl"].ToString();                 HireDate.InnerText = dr["hire_date"].ToString();                 */

                //将子节点加到父节点                 parentNode.PrependChild(FName);                 parentNode.PrependChild(LName);                 parentNode.PrependChild(JobID);                 parentNode.PrependChild(JobLvl);                 parentNode.PrependChild(HireDate);

            }

            //保存成xml文件             xmldoc.Save(fileName);         }

        /** <summary>         /// 添加一个节点         /// </summary>         /// <param name="fileName"></param>         public void AddNewNode(string fileName)         {             XmlDocument xmldoc = new XmlDocument();             xmldoc.Load(fileName);

            //找到根节点             XmlNode rootNode = xmldoc.SelectSingleNode("Employeers");

            //找到子节点             XmlElement parentNode = xmldoc.CreateElement("Employeer");             parentNode.SetAttribute("ID", "EMPID");

            //创建Employeer节点下的子节点             XmlElement FName = xmldoc.CreateElement("FirstName");             XmlElement LName = xmldoc.CreateElement("LastName");             XmlElement JobID = xmldoc.CreateElement("JobID");             XmlElement JobLvl = xmldoc.CreateElement("JobLvl");             XmlElement HireDate = xmldoc.CreateElement("HireDate");

            FName.InnerText = "FName";             LName.InnerText = "LName";             JobID.InnerText = "JOBID";             JobLvl.InnerText = "JOBLVL";             HireDate.InnerText = "HIREDATE";

            parentNode.PrependChild(FName);             parentNode.PrependChild(LName);             parentNode.PrependChild(JobID);             parentNode.PrependChild(JobLvl);             parentNode.PrependChild(HireDate);

            //将新创建的Employeer子节点点加入到根节点。             rootNode.AppendChild(parentNode);

            xmldoc.Save(fileName);         }

        /** <summary>         /// 修改节点         /// </summary>         /// <param name="filename"></param>         private void UpdateNode(string filename)         {             XmlDocument xmldoc = new XmlDocument();             xmldoc.Load(filename);             //得到根节点的所有子节点             XmlNodeList nodeList = xmldoc.SelectSingleNode("Employeers").ChildNodes;             foreach (XmlNode node in nodeList)             {                 XmlElement xe = (XmlElement)node;//强制转换成XmlElement类型。                 if (xe.GetAttribute("ID") == "001")                 {                     XmlNodeList xnodeList = xe.ChildNodes;                     foreach (XmlNode xnode in xnodeList)                     {                         XmlElement xex = (XmlElement)xnode;                         if (xex.Name == "FirstName")                         {                             xex.InnerText = xex.InnerText + "Test";                         }                     }                 }             }             xmldoc.Save(filename);         }

        /** <summary>         /// 删除节点         /// </summary>         /// <param name="filename"></param>         public void DeleteNode(string filename)         {             XmlDocument xmldoc = new XmlDocument();             xmldoc.Load(filename);             XmlNodeList nodelist = xmldoc.SelectSingleNode("Employeers").ChildNodes;             foreach (XmlNode node in nodelist)             {                 XmlElement xe = (XmlElement)node;//强制转换成XmlElement类型。                 //xe.RemoveAttribute("ID");删除节点的ID属性。                 if (xe.GetAttribute("ID") == "001")                 {                     XmlNodeList xnodeList = xe.ChildNodes;                     foreach (XmlNode xnode in xnodeList)                     {                         XmlElement xex = (XmlElement)xnode;                         if (xex.Name == "FirstName")                         {                             xe.RemoveChild(xex);//删除一个节点                         }                     }                 }             }             xmldoc.Save(filename);         }

读取上面保存的xml文件就容易多了直接调用DataSet的ReadXml方法就可以。             DataSet ds = new DataSet();             ds.ReadXml(@"c:\temp\emp.xml");

转载于:https://www.cnblogs.com/ijunxiong/articles/1105672.html

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