private void FrmUpdate_Load(object sender, System.EventArgs e)
        {
            btnFinish.Visible = false;
            string localXmlFile  = Application.StartupPath + "\\UpdateList.xml";
            string serverXmlFile = string.Empty;

            try
            {
                //从本地读取更新配置文件信息
                updaterXmlFiles = new XmlFiles(localXmlFile);
            }
            catch
            {
                MessageBox.Show("配置文件出错!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Close();
                return;
            }
            //获取服务器地址
            updateUrlOnline = updaterXmlFiles.GetNodeValue("//Url");

            AppUpdater.UpdaterUrl = updateUrlOnline + "/UpdateList.xml";

            //与服务器连接,下载更新配置文件
            try
            {
                tempUpdatePath = Environment.GetEnvironmentVariable("Temp") + "\\" +
                                 "_" + updaterXmlFiles.FindNode("//A" +
                                                                "pplication").Attributes["applicati" +
                                                                                         "onId"].Value + "_y_x_m_\\";
                AppUpdater.DownAutoUpdateFile(tempUpdatePath);
            }
            catch (Exception ExpTion)
            {
                MessageBox.Show(ExpTion.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                Close();
                return;
            }
            //获取更新文件列表
            Hashtable htUpdateFile = new Hashtable();

            serverXmlFile = tempUpdatePath + "\\UpdateList.xml";
            if (!File.Exists(serverXmlFile))
            {
                return;
            }

            availableUpdate = AppUpdater.CheckForUpdate(serverXmlFile, localXmlFile, out htUpdateFile);
            if (availableUpdate > 0)
            {
                for (int i = 0; i < htUpdateFile.Count; i++)
                {
                    string[] fileArray = (string[])htUpdateFile[i];
                    lvUpdateList.Items.Add(new ListViewItem(fileArray));
                }
            }
        }
        /// <summary>
        /// 检查更新文件
        /// </summary>
        /// <param name="serverXmlFile"></param>
        /// <param name="localXmlFile"></param>
        /// <param name="updateFileList"></param>
        /// <returns></returns>
        public static int CheckForUpdate()
        {
            string localXmlFile = Application.StartupPath + "\\UpdateList.xml";

            if (!File.Exists(localXmlFile))
            {
                return(-1);
            }

            XmlFiles updaterXmlFiles = new XmlFiles(localXmlFile);

            string tempUpdatePath = Environment.GetEnvironmentVariable("Temp") + "\\" + "_" + updaterXmlFiles.FindNode("//Application").Attributes["applicationId"].Value + "_" + "y" + "_" + "x" + "_" + "m" + "_" + "\\";

            UpdaterUrl = updaterXmlFiles.GetNodeValue("//Url") + "/UpdateList.xml";
            DownAutoUpdateFile(tempUpdatePath);

            string serverXmlFile = tempUpdatePath + "\\UpdateList.xml";

            if (!File.Exists(serverXmlFile))
            {
                return(-1);
            }

            XmlFiles serverXmlFiles = new XmlFiles(serverXmlFile);
            XmlFiles localXmlFiles  = new XmlFiles(localXmlFile);

            XmlNodeList newNodeList = serverXmlFiles.GetNodeList("AutoUpdater/Files");
            XmlNodeList oldNodeList = localXmlFiles.GetNodeList("AutoUpdater/Files");

            int k = 0;

            for (int i = 0; i < newNodeList.Count; i++)
            {
                string[] fileList = new string[3];

                string newFileName = newNodeList.Item(i).Attributes["Name"].Value.Trim();
                string newVer      = newNodeList.Item(i).Attributes["Ver"].Value.Trim();

                ArrayList oldFileAl = new ArrayList();
                for (int j = 0; j < oldNodeList.Count; j++)
                {
                    string oldFileName = oldNodeList.Item(j).Attributes["Name"].Value.Trim();
                    string oldVer      = oldNodeList.Item(j).Attributes["Ver"].Value.Trim();

                    oldFileAl.Add(oldFileName);
                    oldFileAl.Add(oldVer);
                }
                int pos = oldFileAl.IndexOf(newFileName);
                if (pos == -1)
                {
                    fileList[0] = newFileName;
                    fileList[1] = newVer;
                    k++;
                }
                else if (pos > -1 && newVer.CompareTo(oldFileAl[pos + 1].ToString()) > 0)
                {
                    fileList[0] = newFileName;
                    fileList[1] = newVer;
                    k++;
                }
            }
            return(k);
        }