读写XML文件问题

<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="DBConStr" value="Data Source=wanglq;Initial Catalog=MKDB3;User ID=sa;Password=13948721800;Max Pool Size=300" />
    <add key="ClientSettingsProvider.ServiceUri" value="" />    <add key="port" value="60100"/>
    <add key="vdir" value="/exam"/>
    <add key="page" value="default.aspx"/>
    <add key="path" value="exam"/>
  </appSettings>  <system.runtime.remoting>
    <application>
      <client url="http://192.168.0.253:8100">
        <activated type="ActivateService, Service" />
      </client>
      <channels>
        <channel ref="http" port="0" />
      </channels>
    </application>
  </system.runtime.remoting></configuration>我写读写 <system.runtime.remoting>中的 <client url="http://192.168.0.253:8100">里的url值高手帮忙！先谢了！

解决方案 »

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这个用ConfigrationManager就可以直接读了吧？
刚接触.net 不太清楚，能有代码最好谢谢
方法一：使用XML控件
    <% @ Page Language="C#"%>
<html>
<body>
       <h3><font face="Verdana">读取XML方法一</font></h3>
       <from runat=server>
        <asp:Xml id="xml1" DocumentSource="grade.xml" runat="server" />
      </from></body>
</html>方法二：使用DOM技术
<% @ Page Language="C#"%>
<% @ Import Namespace="System.Xml"%>
<% @ Import Namespace="System.Xml.Xsl"%>
  <html>
<script language="C#" runat="server">
void Page_Load(Object sender,EventArgs e)
{
   XmlDocument doc=new XmlDocument();
  doc.Load(Server.MapPath("grade.xml"));
xml1.Document=doc;
}
</script>
<body>
   <h3><font face="Verdana">读取XML方法二</font></h3>
       <from runat=server>
        <asp:Xml id="xml1"  runat="server" />
      </from></body>
</html>方法三：使用DataSet对象
<% @ Page Language="C#"%>
<% @ Import Namespace="System.Data"%>
<% @ Import Namespace="System.Data.OleDb"%>
<script language="C#" runat="server">
void Page_Load(Object sender,EventArgs e)
{
DataSet  objDataSet=new DataSet();
  objDataSet.ReadXml(Server.MapPath("grade.xml"));
dgEmployees.DataSource=objDataSet.Tables["student"].DefaultView;
dgEmployees.DataBind();
}
</script>
<body>
   <h3><font face="Verdana">读取XML方法三</font></h3>
<asp:DataGrid id="dgEmployees" runat="server" /></body>
</html>方法四：按文本方式读取
<% @ Page Language="C#"%>
<% @ Import Namespace="System.Xml"%>
  <html>
<script language="C#" runat="server">
private void Page_Load(Object sender,EventArgs e)
{
XmlTextReader objXMLReader=new XmlTextReader(Server.MapPath("grade.xml"));
string strNodeResult="";
XmlNodeType objNodeType;
while(objXMLReader.Read())
{
objNodeType =objXMLReader.NodeType;
swith(objNodeType)
   {
   case XmlNodeType.XmlDeclaration:
   //读取XML文件头
      strNodeResult+="XML Declaration:<b>"+objXMLReader.Name+""+objXMLReader.Value+"</b><br/>";
     break;
   case XmlNodeType.Element:
  //读取标签
     strNodeResult+="Element:<b>"+objXMLReader.Name+"</b><br/>";
    break;
   case XmlNodeType.Text:
     //读取值
    strNodeResult+=" -Value:<b>"+objXMLReader.Value+"</b><br/>";
   break;

   }
//判断该节点是否有属性
if(objXMLReader.AttributeCount>0)
  {  //用循环判断完所有节点
    while(objXMLReader.MoveToNextAttibute)
     { //取标签和值
     strNodeResult+=" -Attribute:<b>"+objXMLReader.Name+"</b> value:<b>"+objXMLReader.Value+"</b><br/>";
      }
   }
LblFile.Text=strNodeResult;
}
}
</script>
<body>
   <h3><font face="Verdana">读取XML方法四</font></h3>
       <from runat=server>
        <asp:label id="LblFile"  runat="server" />
      </from></body>
</html>
我只想读和写 <system.runtime.remoting>中的 <client url="http://192.168.0.253:8100">里的url值，想得到http://192.168.0.253:8100内容！
楼主，上面已经说了，你用XmlDocument类把xml加载进来，然后用xpath来读取就可以了。
XPathDocument doc = new XPathDocument("demo.xml");
            XPathNavigator nav = doc.CreateNavigator();
            XPathNodeIterator ite = nav.Select(@"configuration/system.runtime.remoting/application/client[@url]");
            ite.MoveNext();
            Console.WriteLine(ite.Current.GetAttribute("url", ""));
XmlDocument xmldoc=new XmlDocument();
xmldoc.Load("文件路径");
XmlNode node=xmldoc.SelectSignleNode("configuration/system.runtime.remoting/application/client");
if(node!=null)
{
  string url=node.Attributes["url"].InnerXml;//获取
  node.Attributes["url"].InnerXml="123";//写
}
xmldoc.Save("文件路径");//写后要保存
        XmlDocument xml = new XmlDocument();
        xml.Load("xml文件路径");
        XmlNode node = xml.SelectSingleNode("configuration/system.runtime.remoting/application/client");
        if (node != null)
        {
          string url = node.Attributes["url"].InnerText;
        }
拼写错了,纠正
xmldoc.SelectSignleNode
==>
xmldoc.SelectSingleNode