对动态内表生成的ALV 在屏幕上如何选择一行记录

请教各位:

FORM USER_COMMAND  USING R_UCOMM LIKE SY-UCOMM

                         RS_SELFIELD TYPE SLIS_SELFIELD.

  DATA: V_COUNT TYPE I.

  CLEAR:  V_COUNT,<dyn_wa>.

  LOOP AT <dyn_table> INTO <dyn_wa>. "WHERE <dyn_field> = 'X'.   u201C这里我应该怎样写来获得屏幕上选的是一行记录？

    V_COUNT = V_COUNT + 1.

  ENDLOOP.

  if not rs_selfield-tabindex eq 0 AND V_COUNT NE 0.

    IF R_UCOMM = '&CHANGE'.

      IF sy-subrc = 0.

        IF V_COUNT = 1.

          CALL SCREEN 100.

          perform dny_field_value_update.

          rs_selfield-refresh = 'X'.

        ENDIF.

      ENDIF.

    endif.

  endif.

ENDFORM.                    "USER_COMMAND

Edited by: andy1982999 on Apr 2, 2010 4:15 AM