/// <summary> /// 获取数据库连接 /// </summary> /// <param name="connStr">数据库连接语句</param> /// <returns></returns> public OleDbConnection GetDbConnection(string connStr = null) { if (string.IsNullOrWhiteSpace(connStr)) { connStr = DbConnectionString; } if (connStr.Trim().ToLower() == DbConnectionString.Trim().ToString() && DbConnection != null) { return(DbConnection); } else { return(new OleDbConnection(DbConnectionString)); } }