C# 获取数据库表名、列名

        List<Dictionary<string, string>>  GetColsName(Guid gtype,string tableName,string itemIndex= "COLUMN_NAME")
        {
            DataTable dsTablesData = DbDataHelper.GetCon().GetOleDbSchemaTable(gtype, new Object[] { null, null, tableName, null });
            List<Dictionary<string, string>> ditCol = new List<Dictionary<string, string>>() ;

            for (int i = 0; i < dsTablesData.DefaultView.Table.Rows.Count; i++)
            {
                ditCol.Add(new Dictionary<string, string> { { i.ToString(), i.ToString() } });
            }

            foreach (DataRow item in dsTablesData.DefaultView.Table.Rows)
            {
                int pos = Convert.ToInt32(item["ORDINAL_POSITION"]);
                int typeIndex = Convert.ToInt32(item["DATA_TYPE"]);

                ditCol[pos-1]= new Dictionary<string, string> { { item[itemIndex].ToString(), DBData.getInstance().GetColNameType(typeIndex) } };
            }

            return ditCol;
        }

        List<string> GetTablesName(Guid gtype,string tableType ="TABLE", string strTableName =null , string itemIndex= "TABLE_NAME")
        {
            List<string> strNames = new List<string>();

            DataTable dsTablesData = DbDataHelper.GetCon().GetOleDbSchemaTable(gtype, new Object[] { null, null, strTableName, tableType });

            foreach (DataRow item in dsTablesData.DefaultView.Table.Rows)
            {
                strNames.Add(item[itemIndex].ToString());
            }

            return strNames;
        }

            DBData.getInstance()._tableNames = GetTablesName(OleDbSchemaGuid.Tables);

            foreach (var tableName in DBData.getInstance()._tableNames)
            {
                List<Dictionary<string, string>> tmp = GetColsName(OleDbSchemaGuid.Columns, tableName);
            }

       /// <summary>
       /// 根据datatable获得列名
       /// </summary>
       /// <param name="dt">表对象</param>
       /// <returns>返回结果的数据列数组</returns>
        public static List<string> GetColumnsByDataTable(DataTable dt)
        {
            List<string> list = new List<string>();

            foreach (DataColumn item in dt.Columns)
            {
                list.Add(item.ColumnName);
            }

            return list;
        }