问大家一个XML问题

Question

我这有一个asp.net操作xml的例子，
xml
<Question>
  <QuestionInfo>
    <title>dfasdfas</title>
    <Ftime>2008-9-8 19:27:05</Ftime>
    <QuestionDetails>dfasdfasdf</QuestionDetails>
    <EnableTime>2050-12-31 0:00:00</EnableTime>
     <Ask id="1">
      <Asktitle>dasfsdfas</Asktitle>
      <Asktype>单选题</Asktype>
      <Askcontent>dfasdfa</Askcontent> 
      <Askcontent>dasfsdfa</Askcontent>
      <Askcontent>dafsdfasd</Askcontent>
    </Ask>
  </QuestionInfo>
</Question>
我想对这个xml进行修改，ask节点下的子节点还可以增加或删除，请哪位大侠帮帮我

Answer 1

xmldocument dom=new xmldocument();
dom.loadxml(xml);
xmlnode node=dom.selectsinglenode("//Ask[@id=1]");
下面你可以操作了.看一上xmlnode的一些帮助即可

Answer 2

using System.Xml;
public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath("data.xml"));
        XmlNode node = doc.DocumentElement;
        XmlNode ask = node.SelectSingleNode ( "QuestionInfo/Ask" );
        XmlElement askChild = doc.CreateElement ( "name" );
        askChild.InnerText = "HelloWorld";
        ask.AppendChild ( askChild );
        doc.Save ( Server.MapPath ( "data.xml" ) );
    }
}<Question> 
  <QuestionInfo> 
    <title>dfasdfas </title> 
    <Ftime>2008-9-8 19:27:05 </Ftime> 
    <QuestionDetails>dfasdfasdf </QuestionDetails> 
    <EnableTime>2050-12-31 0:00:00 </EnableTime> 
    <Ask id="1"> 
      <Asktitle>dasfsdfas </Asktitle> 
      <Asktype>单选题 </Asktype> 
      <Askcontent>dfasdfa </Askcontent> 
      <Askcontent>dasfsdfa </Askcontent> 
      <Askcontent>dafsdfasd </Askcontent> 
    </Ask> 
  </QuestionInfo> 
</Question> 

Answer 3

 /// <summary>
        ///　添加或更新数据
        /// </summary>
        public void AddOrUpdateNode(int id, string strValue)
        {
            try
            {
                XmlNodeList studyNodes = xmlDocument.SelectNodes("Question/QuestionInfo");
                foreach (XmlNode node in studyNodes)
                {
                    //存在则修改
                    if (node.Attributes["id"].Value == id.ToString())
                    {
                        node.Attributes["value"].Value = strValue;
                        xmlDocument.Save(XML_PATH + XML_FILE_NAME);
                        return;
                    }
                }                //不存在则添加
                XmlNodeList topM = xmlDocument.ChildNodes;
                if (topM.Count == 0)
                    return ;
                foreach (XmlNode element in topM)
                {
                    if (element.Name == "Ask")
                    {
                        XmlElement elem = xmlDocument.CreateElement("Asktitle");
                        XmlAttribute xaId = xmlDocument.CreateAttribute("id");
                        xaId.Value = id.ToString();
                        XmlAttribute xaValue = xmlDocument.CreateAttribute("value");
                        xaValue.Value = strValue;
                        elem.SetAttributeNode(xaId);
                        elem.SetAttributeNode(xaValue);
                        element.AppendChild(elem);
                        xmlDocument.Save(XML_PATH + XML_FILE_NAME);
                    }
                }
            }
            catch(XmlException e)
            {
                LogManager.Exceptions(e.Message + "\r\n" + e.Source);
                return ;
            }
        }