XML 读 写

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<info>
<company id="">
</company>
</info>

//判断文件是否存在
if (File.Exists(filePath))
{
XmlDocument xmlDoc = new XmlDocument();//新建XML文件
xmlDoc.Load(filePath);//加载XML文件

XmlNodeList schoolNodeList = xmlDoc.SelectNodes(@"info/company");

company= schoolNodeList[0].Attributes["id"].Value;

}

private void xmlupdate(string value)
{

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(filePath);
XmlElement element = (XmlElement)xmlDoc.SelectSingleNode(@"info/company");
element.SetAttribute("id", value);
xmlDoc.Save(filePath);
}