将SqlDataReader 数据集转化为datatbale ,在将datatable 转化为iList

 public IList GetModelList(string tablename, string where)
          {
              IList list = null;
              DataTable dataTable = new DataTable();
              string sql = "select * from " + tablename;
              if (where != "")
              {
                  sql += " Where " + where;
              }
              try
              {
                  System.Data.SqlClient.SqlDataReader dr = DbHelperSQL.ExcuteReader(sql);
                  for (int i = ; i < dr.FieldCount; i++)
                  {
                      DataColumn mydc = new DataColumn();    //关键的一步
                      mydc.DataType = dr.GetFieldType(i);
                      mydc.ColumnName = dr.GetName(i);
                      dataTable.Columns.Add(mydc);          //关键的第二步
                  }
                  while (dr.Read())
                  {
                      DataRow mydr = dataTable.NewRow();     //关键的第三步
                      for (int i = ; i < dr.FieldCount; i++)
                      {
                          mydr[i] = dr[i].ToString();
                      }
                      dataTable.Rows.Add(mydr);            //关键的第四步
                      mydr = null;
                  }
                  dr.Close();
                  list = dataTable as IList;
                  return (list);

              }
              catch (Exception ex)
              {
                  throw ex;
              }
          }