/// <summary>
        /// 开启加载一个配置。
        /// </summary>
        /// <param name="connName">Conn的名称</param>
        /// <param name="connPath">Conn指向的路径</param>
        /// <returns></returns>
        public static string Start(string connName, string connPath)
        {
            lock (o)
            {
                string path = AppConfig.RunPath + connPath;
                string json = JsonHelper.ReadJson(path);
                if (string.IsNullOrEmpty(json))
                {
                    return(connName);
                }
                WatchConfig config = JsonHelper.ToEntity <WatchConfig>(JsonHelper.GetValue(json, connName));
                if (config != null && !string.IsNullOrEmpty(config.Master))
                {
                    AppConfig.SetConn(connName, config.Master);
                    if (!string.IsNullOrEmpty(config.Backup))
                    {
                        AppConfig.SetConn(connName + "_Bak", config.Backup);
                    }
                    if (config.Slave != null && config.Slave.Length > 0)
                    {
                        for (int i = 0; i < config.Slave.Length; i++)
                        {
                            AppConfig.SetConn(connName + "_Slave" + (i + 1), config.Slave[i]);
                        }
                    }
                    if (!watchList.ContainsValue(connPath))
                    {
                        IOWatch.On(path, delegate(FileSystemEventArgs e)
                        {
                            fsy_Changed(e);
                        });
                    }
                    if (!watchList.ContainsKey(connName))
                    {
                        watchList.Add(connName, connPath);
                    }

                    return(config.Master);
                }
            }
            return(connName);
        }