class DBConnection { private mysqlConnection connection; // public mysqlConnection connection; private string connectionStr; public DBConnection() { try { connectionStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString; connection = new MySqlConnection(connectionStr); } catch (Exception exception) { throw new Exception("DBConnection Constructor:" + exception.Message); } } public DataSet Select() { try { if (connection != null) { connection.Open(); } string cmdStr = "Select * from t_family"; MySqlCommand sqlCmd = new MySqlCommand(cmdStr, connection); MySqlDataAdapter sda = new MySqlDataAdapter(sqlCmd); DataSet ds = new DataSet(); sda.Fill(ds, "t_family"); return ds; } catch (Exception exception) { throw new Exception("SelectMethod:" + exception.Message); } finally { connection.Close(); } } }以上代碼中提示“connection”沒(méi)有定義，怎么回事

單單這段代碼,，在我的VS中沒(méi)有任何錯(cuò)（只是沒(méi)有入口程序）,你檢查下項(xiàng)目的其它部分。

Tags：這段請(qǐng)各位大俠

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