//多表多行多列的情况foreach   (DataTable   dt   in   YourDataset.Tables)   //遍历所有的datatable  {        foreach   (DataRow   dr   in   dt.Rows)   ///遍历所有的行          foreach   (DataColumn   dc   in   dt.Columns)   //遍历所有的列                Console.WriteLine("{0},   {1},   {2}",   dt.TableName,  dc.ColumnName,   dr[dc]);   //表名,列名,单元格数据  }//遍历一个表多行多列  foreach(DataRow   mDr   in   dataSet.Tables[0].Rows   )    {         foreach(DataColumn   mDc   in   dataSet.Tables[0].Columns)        {                  Console.WriteLine(mDr[mDc].ToString());           }    }//遍历一个表多行一列foreach(DataRow   row   in   DataSet1.Tables[0].Rows)    {              Console.WriteLine(row[0].ToString());    }//一行一列ds.Tables[0].Rows[0]["字段"]