C#怎样改变xml文件某个节点的值

[mohugomohu]

<Computers>
<Computer>
<MAC>00:1B:B9:56:87:38</MAC>
<IP>ghjg</IP>
<ComputerName>mohu</ComputerName>
</Computer>
<Setting>
<SubnetMask>255.255.255.0</SubnetMask>
<DefaultGateway>dfg</DefaultGateway>
<FirstDns>gd</FirstDns>
<SecondDns>dfgdf</SecondDns>
<UseNum>11</UseNum>
</Setting>
</Computers>

我想将<UseNum>11</UseNum>
改为<UseNum>11111111111111111</UseNum>
怎么办呢？

[baihe_591]

查找到指定节点

node.InnerText ="111111111111111111";

[ericzhangbo1982111]

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(@"D:\aaa.xml");
XmlNode node=xmlDoc.SelectSingleNode("/Computers/Setting/UseNum")

node.InnerText="111111";
xmlDoc.Save(@"d:\aaa.xml");

[baihe_591]

string ostr="1";
string nstr="111111";
XmlDocument MyXMLDoc = new XmlDocument();
MyXMLDoc.Load(Application .StartupPath  + "\\yours.xml");
try
{   
    string myfindstring = "Computers/Setting [UseNum=" + '"' + ostr+ '"' + "]";
    XmlNode MyNode = MyXMLDoc.SelectSingleNode(myfindstring);
    if(MyNode!=null)
       MyNode.InnerText=nstr;
}
catch(Exception ex)
{
    MessageBox.Show(ex.message);
}
    

[baihe_591]

少了一句:

MyXMLDoc.Save(Application .StartupPath  + "\\yours.xml");