c#解决高并发--加锁(Lock)

private static object sign = new object();



        public static DBHelper CreateMapping(string connStr = "")

        {

            DBHelper db = new DBHelper(connStr);

            return db;

        }



        /// <summary>

        /// 增删改的数据库连接字符串

        /// </summary>

        string conString = "";

        /// <summary>

        /// 查询的数据库连接字符串

        /// </summary>

        string queryConString = "";



        DBHelper(string connStr = "")

        {

            if (string.IsNullOrWhiteSpace(connStr))

            {

                conString = AsString(ConfigurationManager.ConnectionStrings["DBConfig"]);

                if(string.IsNullOrEmpty(conString))WriteErrorLogDataInteraction(conString,"连接字符串获取失败！");

                //第一个链接字符串是ConfigurationManager.ConnectionStrings[0].Name LocalSqlServer不知道是谁，所以要从第二个取

                //如果连接字符串的数量和当前索引+1相同 则从第一个索引开始取

                NameValueCollection connStrs = new NameValueCollection();

                int j = 0;

                for (int i = 0; i < ConfigurationManager.ConnectionStrings.Count; i++)

                {

                    if (ConfigurationManager.ConnectionStrings[i].Name.StartsWith("QueryDB"))

                    {

                        connStrs.Add(j.ToString(), ConfigurationManager.ConnectionStrings[i].ToString());

                        j++;

                    }

                }

                // 加锁

                lock (sign)

                {

                    if (connStrs.Count > 0)

                    {

                        if (connStrs.Count >= ConnIndex)

                        {

                            ConnIndex = 0;

                        }

                        queryConString = connStrs[ConnIndex].ToString();

                        ConnIndex++;

                    }

                    else

                    {

                        queryConString = conString;

                    }

                }

            }

            else

            {

                conString = connStr;

                queryConString = connStr;

            }



            DBMapping = new SqlDatabase(conString);

            QueryDBMapping = new SqlDatabase(queryConString);



        }

DBHelper如果多个进行同时运行时，就会出现错误。所以应该加上锁Lock 。以确保一个线程执行完之后再执行另一个线程。