C#中的XML字段替换

<?xml version="1.0"?>
<Users>
  <User ID="1">
    <nickname>Tom</nickname>
    <password>a password</password>
    <host>[email protected]</host>
    <email>anemail</email>
    <isloggedin>false</isloggedin>
    <permission>10</permission>
  </User>
  <User ID="2">
    <nickname>ohai</nickname>
    <password>sercret</password>
    <host>my@host</host>
    <email>my@email</email>
    <isloggedin>false</isloggedin>
    <permission>1</permission>
  </User>
<Users>

现在,首先,我将返回他们的身份证号码,因此,请病假为“ 2”.
从那开始,我将需要进入并编辑其中的字段,并重新保存xml.
所以基本上我需要的是打开文件,找到用户ID =“ 2”的信息,然后使用用户2内的DIFFERENT值重新保存xml,而不会影响文档的其余部分.

范例：

  <User ID="2">
    <nickname>ohai</nickname>
    <password>sercret</password>
    <host>my@host</host>
    <email>my@email</email>
    <isloggedin>false</isloggedin>
    <permission>1</permission>
  </User>

//在这里进行更改,最后得到

  <User ID="2">
    <nickname>ohai</nickname>
    <password>somthing that is different than before</password>
    <host>the most current host that they were seen as</host>
    <email>my@email</email>
    <isloggedin>false</isloggedin>
    <permission>1</permission>
  </User>

等等

摘要：
我需要打开一个文本文件,通过ID号返回信息,编辑信息,重新保存文件.不影响用户2以外的任何其他用户

〜谢谢！

// create new XmlDocument and load file
XmlDocument xdoc = new XmlDocument();
xdoc.Load("YourFileName.xml");

// find a <User> node with attribute ID=2
XmlNode userNo2 = xdoc.SelectSingleNode("//User[@ID='2']");

// if found, begin manipulation    
if(userNo2 != null)
{
   // find the <password> node for the user
   XmlNode password = userNo2.SelectSingleNode("password");
   if(password != null)
   {
      // change contents for <password> node 
      password.InnerText = "somthing that is different than before";
   }

   // find the <host> node for the user
   XmlNode hostNode = userNo2.SelectSingleNode("host");
   if(hostNode != null)
   {
      // change contents for <host> node 
      hostNode.InnerText = "the most current host that they were seen as";
   }

   // save changes to a new file (or the old one - up to you)
   xdoc.Save("YourFileNameNew.xml");
}

如果您使用的是.NET 3.5及更高版本,则还可以检查Linq-to-XML,这可能是一种甚至更简单的操作XML文档的方法.

渣