Xml文档的应用

Xml，个人感觉就是一个比较特殊的文本档，刚上手的时候感觉很别扭，不过能感觉的出来，当用熟了将会很方便。

下面是Xml应用的一些代码：

 XmlDocument xdoc = new XmlDocument();
        protected void Page_Load(object sender, EventArgs e)
        {
            #region
            //XmlReaderSettings settings = new XmlReaderSettings();
            //settings.IgnoreComments = true;//忽略Xml中的注释
            //settings.IgnoreWhitespace = true;//忽略没必要的空白

            //using (XmlReader reader = XmlReader.Create(Server.MapPath("books.xml"), settings))//第一个参数需要的是实路径
            //{
            //    int booknum = 0;
            //    while (reader.Read())
            //    {
            //        if (reader.NodeType == XmlNodeType.Element)
            //        {
            //            if (reader.LocalName == "book")
            //            {
            //                booknum++;
            //            }
            //        }
            //    }
            //    Response.Write(booknum);
            //}

            //XmlWriterSettings settingsw=new XmlWriterSettings();//write的设置
            //settingsw.Encoding=System.Text.Encoding.UTF8;//编码类型
            //settingsw.Indent=true;
            //using (XmlWriter writere = XmlWriter.Create(Server.MapPath("newbook.xml"), settingsw))
            //{
            //    writere.WriteStartDocument();//开始写版本以及链接

            //    writere.WriteStartElement("books");//根节点

            //    writere.WriteStartElement("book");//book节点开始

            //    writere.WriteStartAttribute("id");//给book添加属性  属性名为id
            //    writere.WriteValue("1");//写入属性值
            //    writere.WriteEndAttribute();//属性编辑结束

            //    writere.WriteStartElement("author");//author节点开始
            //    writere.WriteString("乔布斯");//写入author节点内容
            //    writere.WriteEndElement();//结束author节点

            //    writere.WriteEndElement();//结束book节点

            //    writere.WriteStartElement("book");//book节点开始
            //    writere.WriteStartElement("author");//author节点开始
            //    writere.WriteString("布鲁斯");//写入author节点内容
            //    writere.WriteEndElement();//结束author节点
            //    writere.WriteEndElement();//结束book节点

            //    writere.WriteEndElement();//结束books节点
            //    writere.WriteEndDocument();//结束
            //}
            #endregion
            xdoc.Load(Server.MapPath("books.xml"));
            if (!IsPostBack)
            {
                XmlNodeList xlist = xdoc.GetElementsByTagName("name");//将标记为name的内容提取出来
                foreach (XmlNode item in xlist)//给前台的一个下拉菜单添加项
                {
                    DropDownList1.Items.Add(item.InnerText);
                }

            }
            #region


            //XmlNode nod = xdoc.DocumentElement.SelectSingleNode("book[name='"+DropDownList1.Text+"']");
            //if (nod.LocalName == "author")
            //    TextBox1.Text = nod.InnerText;
            //if (nod.LocalName == "publisher")
            //    TextBox2.Text = nod.InnerText;
            //if (nod.LocalName == "date")
            //    TextBox3.Text = nod.InnerText;
            //if (nod.LocalName == "isbn")
            //    TextBox4.Text = nod.InnerText;
            //if (nod.LocalName == "price")
            //    TextBox5.Text = nod.InnerText;
            #endregion
        }

        protected void Button1_Click(object sender, EventArgs e)//显示
        {
            #region
            //XmlDocument xdoc = new XmlDocument();
            //xdoc.Load(Server.MapPath("books.xml"));
            //XmlNodeList xlist = xdoc.GetElementsByTagName("name");
            //foreach (XmlNode item in xlist)
            //{
            //    DropDownList1.Items.Add(item.InnerText);
            //}
            #endregion
            XmlNode nod = xdoc.DocumentElement.SelectSingleNode("book[name='" + DropDownList1.Text + "']");//获取Xml文档中下拉菜单选中的那一组
            foreach (XmlNode item in nod)//用一个循环把内容放到对应的TextBox里面
            {
                TextBox1.Text = nod.ChildNodes.Item(0).InnerText;
                TextBox2.Text = nod.ChildNodes.Item(1).InnerText;
                TextBox3.Text = nod.ChildNodes.Item(2).InnerText;
                TextBox4.Text = nod.ChildNodes.Item(4).InnerText;
                TextBox5.Text = nod.ChildNodes.Item(5).InnerText;
                #region
                //if (nod.ChildNodes.Item(1) == "author")
                //    TextBox1.Text = item.InnerText;
                //if (nod.LocalName == "publisher")
                //    TextBox2.Text = item.InnerText;
                //if (nod.LocalName == "date")
                //    TextBox3.Text = item.InnerText;
                //if (nod.LocalName == "isbn")
                //    TextBox4.Text = item.InnerText;
                //if (nod.LocalName == "price")
                //    TextBox5.Text = item.InnerText;
                #endregion
            }
        }

        protected void Button2_Click(object sender, EventArgs e)//移除
        {
            XmlNode nod = xdoc.DocumentElement.SelectSingleNode("book[name='" + DropDownList1.Text + "']");//获取Xml文档中下拉菜单选中的那一组
            xdoc.DocumentElement.RemoveChild(nod);//移除Xml文档中的项
            DropDownList1.Items.Remove(DropDownList1.SelectedItem);//移除下拉菜单中的项
            xdoc.Save(Server.MapPath("books.xml"));//将修改完的Xml存到Xml文档
        }

        protected void Button3_Click(object sender, EventArgs e)//修改
        {
            XmlNode nod = xdoc.DocumentElement.SelectSingleNode("book[name='" + DropDownList1.Text + "'");//获取Xml文档中下拉菜单选中的那一组
            nod.SelectSingleNode("author").InnerText = TextBox1.Text;//将对应的TextBox中的内容放到Xml文档的对应标记里面
            nod.SelectSingleNode("publisher").InnerText = TextBox2.Text;
            nod.SelectSingleNode("date").InnerText = TextBox3.Text;
            nod.SelectSingleNode("isbn").InnerText = TextBox4.Text;

            nod.SelectSingleNode("price").InnerText = TextBox5.Text;
            xdoc.Save(Server.MapPath("books.xml"));//保存Xml文档
            //Page.RegisterClientScriptBlock("key1", "<script>alert('ok!');</script>");
            this.ClientScript.RegisterClientScriptBlock(this.GetType(),"key2","<script>alert('ok!');</script>");//插入脚本，一个小提示
            #region
            //DropDownList1.Items.Clear();
            //XmlNodeList xlist = xdoc.GetElementsByTagName("name");
            //foreach (XmlNode item in xlist)
            //{
            //    DropDownList1.Items.Add(item.InnerText);
            //}
            #endregion
        }

        protected void Button4_Click(object sender, EventArgs e)//添加
        {
            XmlElement bo = xdoc.CreateElement("book");//创建新的标记book，并将其放到bo里面
            XmlElement au = xdoc.CreateElement("author");//创建新的标记au，并将其放到au里面
            au.AppendChild(xdoc.CreateTextNode(TextBox1.Text));//给标记au增添内容
            XmlElement pu = xdoc.CreateElement("publisher");
            pu.AppendChild(xdoc.CreateTextNode(TextBox2.Text));
            XmlElement na = xdoc.CreateElement("name");
            na.AppendChild(xdoc.CreateTextNode(TextBox6.Text));
            XmlElement da = xdoc.CreateElement("date");
            da.AppendChild(xdoc.CreateTextNode(TextBox3.Text));
            XmlElement si = xdoc.CreateElement("isbn");
            si.AppendChild(xdoc.CreateTextNode(TextBox4.Text));
            XmlElement pr = xdoc.CreateElement("price");
            pr.AppendChild(xdoc.CreateTextNode(TextBox5.Text));
            bo.AppendChild(au);//将对象节点对象au放到节点对象bo里面
            bo.AppendChild(pu);
            bo.AppendChild(na);
            bo.AppendChild(da);
            bo.AppendChild(si);
            bo.AppendChild(pr);
            xdoc.DocumentElement.AppendChild(bo);//将包含au、pu等节点的bo节点放到xdoc里面
            this.DropDownList1.Items.Add(this.TextBox6.Text);//给下拉菜单增添项
            xdoc.Save(Server.MapPath("books.xml"));//保存
            ClientScript.RegisterClientScriptBlock(this.GetType(),"key3","<script type='text/javascript'>alert('ok!');</script>");
        }

上面主要是用了XmlDocument这个东西，通过XmlDocument的实例化对象对Xml文件进行操作。增添、删除、修改、查看。