使用XML文件记录操作日志，并从后往前读取操作日志并在richTextBox1控件中显示出来

        #region 获取本地程序操作记录日志
        /// <summary>
        /// 获取本地程序更新日志信息(由后往前读取)
        /// </summary>
        private void GetLoacalOPRecordLogInfo()
        {
            XmlDocument xmlDocGet = new XmlDocument();
            xmlDocGet.Load(Application.StartupPath + @"Log.xml");
            XmlNodeList xnl = xmlDocGet.SelectNodes("/Log/LogEvent");
            if (xnl != null)
            {
                for (int i = xnl.Count; i >= 0; i--)
                {
                    XmlNode ChNode = (XmlNode)xnl[i];
                    if (ChNode != null)
                    {
                        if (ChNode.Name == "LogEvent")
                        {
                            foreach (XmlNode ChNodeChild in ChNode.ChildNodes)
                            {
                                switch (ChNodeChild.Name.Trim())
                                {
                                    case "Date":
                                        Logdate = ChNodeChild.InnerText.Trim();   //更新日期
                                        break;
                                    case "Contact1":
                                        logContact1 = ChNodeChild.InnerText.Trim();
                                        break;
                                    case "Contact2":
                                        logContact2 = ChNodeChild.InnerText.Trim();
                                        break;
                                    default:
                                        break;
                                }
                            }
                        }
                        //此处添加内容到文本控件
                        richTextBox1.AppendText("查询日期:" + Logdate.Trim() + Environment.NewLine);
                        richTextBox1.AppendText("查询结果:" + Environment.NewLine);
                        richTextBox1.AppendText("      " + logContact1.ToString().Trim() + Environment.NewLine);
                        richTextBox1.AppendText("邮件发送:" + Environment.NewLine);
                        richTextBox1.AppendText("      " + logContact2.ToString().Trim() + Environment.NewLine);
                        richTextBox1.AppendText("" + Environment.NewLine);
                        richTextBox1.AppendText("************************************************************" + Environment.NewLine);
                    }
                }
            }
        }
        #endregion