c#操作xml增删改查

1.首先新建一个xml文件(Root是我写上的)

2.

3.直接上代码，更直观

（1）初始化xml

　　

  /// <summary>
        /// 初始化xml
        /// </summary>
        public void LoadXml()
        {
            xmlDoc = new XmlDocument();
            xmlDoc.Load(Server.MapPath("../wx.xml"));
        }

（2）添加节点

 /// <summary>
        /// 向xml中添加数据
        /// </summary>
        public void AddElement(string FromUserName)
        {
            LoadXml();
            XmlNode xmldocSelect = xmlDoc.SelectSingleNode("Root");//查找节点
            XmlElement el = xmlDoc.CreateElement("Person");  //添加person节点  
            el.SetAttribute("name", FromUserName);  //添加person节点的属性"name" 
            el.SetAttribute("time", DateTime.Now.ToString());
            xmldocSelect.AppendChild(el);
            xmlDoc.Save(Server.MapPath("../wx.xml")); 
        }

（3）修改节点中的某个属性

  /// <summary>
        /// 修改xml属性
        /// </summary>
        /// <param name="FromUserName"></param>
        public void editXml(string FromUserName)
        {
            LoadXml();
            XmlNodeList xnl = xmlDoc.DocumentElement.ChildNodes;
            foreach (XmlElement elementxml in xnl)
            {
                if (elementxml.Name == "Person")
                {
                    if (elementxml.Attributes["name"].Value == FromUserName)
                    {
                        elementxml.Attributes["time"].Value = DateTime.Now.ToString();
                    }
                }
            }
            xmlDoc.Save(Server.MapPath("../wx.xml"));
        }

（4）判断xml中是否含有这个属性

 //判断是否已经写入到xml中
        public string IsExitXml(string FromUserName)
        {
            string datetime = "";
            LoadXml();
            XmlNodeList xnl = xmlDoc.DocumentElement.ChildNodes;
            foreach (XmlElement element in xnl)
            {
                if (element.Name == "Person")
                {
                    if (element.Attributes["name"].Value ==FromUserName)
                    {
                        datetime = element.Attributes["time"].Value;
                    }
                }
            }
            return datetime;
        }

(5)删除和修改差不多，对于我这个xml格式而言要这样删除

  public void DeleteXml(string FromUserName="dddddd")
        {
            LoadXml();
            XmlNodeList xnl = xmlDoc.DocumentElement.ChildNodes;
            foreach (XmlElement elementxml in xnl)
            {
                if (elementxml.Name == "Person")
                {
                    if (elementxml.Attributes["name"].Value == FromUserName)
                    {
                        XmlNode xmldocSelect = xmlDoc.SelectSingleNode("Root");
                        xmldocSelect.RemoveChild(elementxml);
                    }
                }
            }
            xmlDoc.Save(Server.MapPath("../wx.xml"));
        }

（6）我的xml格式是这样的