求教：关于 IS AS 的用法。(50分)

C

crazymoon

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2002-11-07

• #1

在一个面板中放了几个CHECKBOX。
再放一个按钮（名为全部选中），如何编？
我想的是：
for i:=0 to panel1.controlcount-1 do
if panel1.controls is tcheckbox then
panel1.controls.checked:=true;
这不行

 

R

Richard3000

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2002-11-07

• #2

for i:=0 to panel1.controlcount-1 do
if panel1.controls is tcheckbox then
tcheckbox(panel1.controls).checked:=true;

 

R

Richard3000

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2002-11-07

• #3

for i:=0 to panel1.controlcount-1 do
if panel1.controls is tcheckbox then
(panel1.controls as tcheckbox).Checked:=True;

 

J

jdhx_ren

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2003-05-27

• #4

aa