生成和读取XML文件的方法

自己根据网上现有的代码，改写而成的。

生成XML文件的代码：

/// <summary>
        ///
        /// </summary>
        /// <param name="dt">需要传的参数</param>
        public static void getXml(DataTable dt)
        {
            string path = System.Web.HttpContext.Current.Server.MapPath("~/XML//");//生成文件所在的位置
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            path += "Plant.xml";//文件名称
            exportToXml(path, dt);
        }
        /// <summary>
        /// 生成XML文件
        /// </summary>
        /// <param name="filename">文件路径</param>
        /// <param name="dt">数据源</param>
        public static void exportToXml(string filename, DataTable dt)
        {
            StreamWriter sr = new StreamWriter(filename, false, System.Text.Encoding.UTF8);
            //写文件头部内容
            //下面是生成RSS的OPML文件
            sr.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
            sr.WriteLine("<Vote>");
            sr.WriteLine("<VoteInfo><ID>1</ID><VoteTitle></VoteTitle>");
            int i = 0;
           
            if (dt.Rows.Count > 0)
            {
                for (int k = 0; k < dt.Rows.Count;k++ )
                {
                    i++;
                    if (k == 0)
                    {
                        sr.WriteLine("<Item>");
                        sr.WriteLine("<VoteID>" + i + "</VoteID>");
                        sr.WriteLine("<Title>" + Convert.ToDateTime(dt.Rows[k]["Addtime"].ToString()).ToLongDateString() + "</Title>");
                        string shen = "";
                        string unit = "";
                        string m = dt.Rows[k]["Height"].ToString();
                        Regex reg = new Regex(@"[^0-9,^.]+");
                        Regex reg2 = new Regex(@"[^A-Za-z]+");
                        shen = reg.Replace(m, "");
                        unit = reg2.Replace(m, "");
                        sr.WriteLine("<Unit>"+unit+"</Unit>");
                        sr.WriteLine("<Count>" + shen + "</Count>");
                        sr.WriteLine("</Item>");
                    }
                    else
                    {
                        sr.WriteLine("<Item>");
                        sr.WriteLine("<VoteID>" + i + "</VoteID>");
                        sr.WriteLine("<Title>" + Convert.ToDateTime(dt.Rows[k-1]["Updatetime"].ToString()).ToLongDateString() + "</Title>");

                        string shen = "";
                        string unit = "";
                        string m = dt.Rows[k]["Height"].ToString();
                        Regex reg = new Regex(@"[^0-9,^.]+");
                        Regex reg2 = new Regex(@"[^A-Za-z]+");
                        shen = reg.Replace(m, "");
                        unit = reg2.Replace(m, "");
                        sr.WriteLine("<Unit>" + unit + "</Unit>");
                        sr.WriteLine("<Count>" + shen + "</Count>");
                        sr.WriteLine("</Item>");
                    }
                }
            }

            //写文件尾部内容
            sr.WriteLine("</VoteInfo>");
            sr.WriteLine("</Vote>");
            sr.Close();
        }

读取xml文件的代码：

/// <summary>
        /// 获取xml中的数据（）
        /// </summary>
        /// <param name="xdata">x轴数据</param>
        /// <param name="ydata">y轴数据</param>
        /// <param name="unit">单位</param>
        public static void getXML(string xdata, string ydata, string unit)
        {
            XmlDocument myDoc = new XmlDocument();
            myDoc.Load(System.Web.HttpContext.Current.Server.MapPath("~/XML//Plant.xml"));

            XmlNode xn = myDoc.SelectSingleNode("//VoteInfo[ID='1']");//读取数据源

            XmlNodeList xnl = xn.SelectNodes("Item");

            for (int i = 0; i < xnl.Count; i++)
            {
                XmlNode xn0 = xnl.Item(i);
                ydata += xn0.SelectSingleNode("Count").InnerText + ",";
                xdata += "\'" + xn0.SelectSingleNode("Title").InnerText + "\'" + ",";
                unit = xn0.SelectSingleNode("Unit").InnerText;
            }
            ydata = ydata.Remove(ydata.Length - 1, 1);
            xdata = xdata.Remove(xdata.Length - 1, 1);
        }