XML常用操作

 XML在我们的程序中用到的越来越多，因为它存储、读取、修改都比较方便。
下面我来分享一下XML的常用操作(增删改查)，下面是程序运行效果：
增(增加节点包括创建XML):
/// <summary>
/// 创建XML文档
/// </summary>
/// <param name="path"></param>
public static void CreateXML(string path, Student stu)
{
XmlTextWriter xw = new XmlTextWriter(path, Encoding.UTF8);
xw.WriteStartDocument();
xw.Formatting = Formatting.Indented;
xw.WriteStartElement("Students");
xw.WriteStartElement("Student");
xw.WriteStartElement("SID");
xw.WriteStartAttribute("id");
xw.WriteValue(stu.SID.ToString());
xw.WriteEndAttribute();
xw.WriteValue(stu.SID.ToString());
xw.WriteEndElement();
xw.WriteStartElement("Name");
xw.WriteValue(stu.Name);
xw.WriteEndElement();
xw.WriteStartElement("Age");
xw.WriteValue(stu.Age.ToString());
xw.WriteEndElement();
xw.WriteStartElement("Sex");
xw.WriteValue(stu.Sex);
xw.WriteEndElement();
xw.WriteStartElement("Address");
xw.WriteValue(stu.Address);
xw.WriteEndElement();
xw.WriteEndElement();
xw.WriteEndElement();
xw.Flush();
xw.Close();
MessageBox.Show(path + " 创建成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}

删(根据条件删除)：
/// <summary>
/// 删除操作
/// </summary>
/// <param name="path">XML路径</param>
/// <param name="id">删除的ID</param>
public static void Delete(string path, string id)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(path);
XmlNode xnl = xmlD