XML读取数据

      string strPath = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/Interface.xml");

        System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument(); //定义XmlDocument对象

        xmlDoc.Load(strPath);

        //的是建立一个XPATH表达式,作用是查找所有名字是Item,属性ID=strWebCode的节点
        string xpath = "//Item[@WebCode='ssssqunar']";

          //获得xml文件的根节点
        XmlNode baseNode = xmlDoc.DocumentElement;
        //以根节点下的所有节点为查询返回,获得一个符合XPATH表达式的子节点
        XmlNode selectedNode = xmlDoc.SelectSingleNode(xpath);

        if (selectedNode != null)
        {
            string strUri = selectedNode.Attributes[2].InnerText;

            Response.Write(strUri);
        }
        else
        {
            Response.Write("未能请取数据");
        }

我写的一个xml新闻系统的源代码希望对你有用

一.添加数据:

C# code

public bool AddArticle(string NewsTitle, string NewsContent, string NewsClassID)
{
    XmlDocument doc = new XmlDocument();
    doc.Load(HttpContext.Current.Server.MapPath(articlePath)); //装载文章xml
    int newID = 1;
    if (doc.DocumentElement.SelectSingleNode("//Article[@ID]") != null)
    {
        //最后一个文章ID+1就是新的文章ID
        newID = Convert.ToInt32(doc.DocumentElement.SelectSingleNode("//Article[last()]").Attributes["ID"].Value) + 1;
    }
    XmlElement el = doc.CreateElement("Article");
    XmlAttribute id = doc.CreateAttribute("ID");
    id.Value = newID.ToString();
    XmlAttribute title = doc.CreateAttribute("Title");
    title.Value = NewsTitle;
    XmlAttribute date = doc.CreateAttribute("Date");
    date.Value = DateTime.Now.ToString();
    XmlAttribute classID = doc.CreateAttribute("ClassID");
    classID.Value = NewsClassID;
    XmlCDataSection content = doc.CreateCDataSection(NewsContent);

    el.Attributes.Append(id);
    el.Attributes.Append(title);
    el.Attributes.Append(classID);
    el.Attributes.Append(date);
    el.AppendChild(content);
    doc.DocumentElement.AppendChild(el);
    doc.Save(HttpContext.Current.Server.MapPath(articlePath));
    return true;
}

二.修改数据

C# code

public bool EditArticle(string NewsTitle, string NewsContent, string NewsID)
{
    try
    {
        XmlDocument document = new XmlDocument();
        document.Load(HttpContext.Current.Server.MapPath(this.articlePath));
        XmlNode node = document.DocumentElement.SelectSingleNode("Article[@ID=" + NewsID + "]");
        if (node != null)
        {
            node.Attributes["Title"].Value = NewsTitle;
            node.FirstChild.Value = NewsContent;
        }
        document.Save(HttpContext.Current.Server.MapPath(this.articlePath));
        return true;
    }
    catch
    {
        return false;
    }
}

三.删除数据

C# code

public bool DeleteArticle(string NewsID)
{
    bool flag = false;
    try
    {
        XmlDocument document = new XmlDocument();
        document.Load(HttpContext.Current.Server.MapPath(this.articlePath));
        XmlNode oldChild = document.DocumentElement.SelectSingleNode("Article[@ID=" + NewsID + "]");
        if (oldChild != null)
        {
            oldChild.ParentNode.RemoveChild(oldChild);
        }
        document.Save(HttpContext.Current.Server.MapPath(this.articlePath));
    }
    catch
    {
        flag = false;
    }
    return flag;
}

转自：http://topic.csdn.net/u/20080612/23/f7d0b53e-27ca-4822-b0b9-46355db51fab.html