读写XML

1，通过写入xml生成sitemap

    

public int SetXML(DataTable tb, int num)
        {
            if (tb != null && tb.Rows.Count > 0)
            {
                var xmlDoc = new XmlDocument();
                //加入XML的声明段落 
                XmlNode xmlnode = xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null);
                xmlDoc.AppendChild(xmlnode);

                var els = xmlDoc.CreateElement("urlset");
                xmlDoc.AppendChild(els);
                for (int i = 0; i < tb.Rows.Count; i++)
                {
                    var el = xmlDoc.CreateElement("url");
                    els.AppendChild(el);
                    XmlElement elementLoc = xmlDoc.CreateElement("loc");
                    elementLoc.InnerText = "http://www.tz1288.com/news_view_" + tb.Rows[i]["nsID"] + ".html";
                    el.AppendChild(elementLoc);
                    XmlElement elementLastmod = xmlDoc.CreateElement("lastmod");
                    elementLastmod.InnerText = "2015-05-22";
                    el.AppendChild(elementLastmod);
                    XmlElement elementChangefreq = xmlDoc.CreateElement("changefreq");
                    elementChangefreq.InnerText = "daily";
                    el.AppendChild(elementChangefreq);
                    XmlElement elementPriority = xmlDoc.CreateElement("priority");
                    elementPriority.InnerText = "0.7";
                    el.AppendChild(elementPriority);
                    XmlElement elementData = xmlDoc.CreateElement("data");
                    el.AppendChild(elementData);
                    XmlElement elementdisplay = xmlDoc.CreateElement("display");
                    elementData.AppendChild(elementdisplay);
                    XmlElement elementhtml5_url = xmlDoc.CreateElement("html5_url");
                    elementhtml5_url.InnerXml = "<![CDATA[http://m.tz1288.com/news_view_" + tb.Rows[i]["nsID"]+".html]]>";
                    elementdisplay.AppendChild(elementhtml5_url);
                }
                string url = MapPath("~/map/news/sitemap_baidu" + num + ".xml");
                xmlDoc.Save(url);
            }
            return 1;
        }

2，读写XML文本

 

/// <summary>
        /// 写入xml
        /// </summary>
        /// <param name="tb"></param>
        /// <returns></returns>
        private bool SetXml(DataTable tb)
        {
            //设置文件路径 方法名#参数1#参数2...#.xml
            string XmlPath = @"\XmlCacheNew\";
            XmlPath = HttpContext.Current.Server.MapPath("~/" + XmlPath);
            StringBuilder xmlName = new StringBuilder(XmlPath + "\\");
            if (!Directory.Exists(xmlName.ToString()))
            {
                Directory.CreateDirectory(xmlName.ToString());
            }
            xmlName.Append("buysell.xml");

            //判断文件是否存在 
            bool flag = true;//判断数据是否写入成功
            if (File.Exists(xmlName.ToString()))
            {
                //存在就删除
                File.Delete(xmlName.ToString());
            }

            try
            {
                tb.WriteXml(xmlName.ToString(), XmlWriteMode.WriteSchema);
                flag = true;
            }
            catch (TypeInitializationException e)
            {
                flag = false;
            }
            return flag;
        }

        /// <summary>
        /// 读取
        /// </summary>
        /// <returns></returns>
        public DataTable GetXml()
        {
            DataTable _xmlDataSet = null;
            if (_xmlDataSet == null)
            {
                try
                {
                    string _XmlPath = @"\XmlCacheNew\";
                    if (_XmlPath.IndexOf(":") < 0)
                    {
                        _XmlPath = HttpContext.Current.Server.MapPath("~/" + _XmlPath);
                    }
                    DataTable ds = new DataTable();
                    ds.ReadXml(_XmlPath + "buysell.xml");
                    _xmlDataSet = ds;
                }
                catch (Exception)
                {
                }
            }
            return _xmlDataSet;
        }