遍历Datatable

 //方法一
    DataSet dataSet = new DataSet();
    DataTable dt = dataSet.Tables[];
    for (int i = ; i < dt.Rows.Count; i++)
     {
      string strName = dt.Rows[i]["字段名"].ToString();
     }  

//方法二
DataSet myDataSet = new DataSet();
            foreach (DataRow myRow in myDataSet.Tables["temp"].Rows)
            {
                var str = myRow[].ToString();
            }
//方法三
  DataTable dt = new DataTable();
            foreach (DataRow dr in dt.Rows)
            {
                object value = dr["ColumnsName"];
            }

 //方法四 遍历datatable获取其中的值某一字段的值
            DataTable dt = new DataTable();
            string key = string.Empty;
            //DICNAME、CNNAME数据库表中字段，根据这2个字段值来筛选数据
            DataRow[] drs = dt.Select(string.Format("DICNAME='{0}' AND CNNAME='{1}'", ZiDuan, Zhi));
            if (drs.FirstOrDefault()  != null)
            {
                foreach (DataRow row in drs)
                {
                    //遍历筛选过的数据获取其中某个字段的值
                    key = ConvertObjectToString(row["SUBCODE"]);
                }
            }

       public string ConvertObjectToString(object obj)
        {
            if (obj != null)
            {
                return obj.ToString();
            }
            return string.Empty;
        }