tag属性怎么用？？

Question

form1.tag:=9;
没有实际意义，你可以用它保存一些东西。
delphi没有用到它

Answer 1

呵呵，關系是你如何去用它！tag是不個很有用的屬性，我愛上它了！
如你的FORM有兩種狀態，在不同的狀態的某些構件的enabled有所變化.就用行上Tag.
例子：
   如Form1中用DBEdit1,DBEdit2,DBEdit3,DBEdit4和其它構件，有兩種狀態一種是編輯狀態，一種是瀏覽狀態。
   當瀏覽狀態中，Edit1,Edit2,Edit3,Edit4->Enabled=False;
   當是編輯狀態下,反之。
  在轉換狀態的時候，你可能要每一個構件更改它的Enabled屬性。這樣是一件比較麻煩的事，而且在不同的FORM中如果有相同的要求，你也得這樣做。
   有了TAG，你可以用以下的公用語句來解決這個問題，你隻要在需更改狀態的時候，使用這個過程就可以了。
   準備，把需要更改狀態的構件的TAG設為同一個值 ，如100。
procedure ....
var
 I : Integer;
.....
begin
 ....
 for I:=0 to ComponentCount-1 do
 begin
  if Components[I].Tag<>100 then Continue;
  if UpperCase(Components[I].ClassName)='TDBEDIT' then
   TDBEdit(Components[I]).Enabled:=not TDBEdit(Components[I]).Enabled;
 end;//for
end;

Answer 2

當瀏覽狀態中，Edit1,Edit2,Edit3,Edit4->Enabled=False;
應為
當瀏覽狀態中，DBEdit1,DBEdit2,DBEdit3,DBEdit4->Enabled=False;
^&^

Answer 3

比如要在窗体上找某个控件，但是又不知道它的类型，就可以用TAG来定位了，还有判断窗体焦点的时候也可以
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
99999999999B@B@B@BBBMMMM999999999999999999999999999
999999999999M+:.:+9999M:999999999999999999999999999
9999999999999MM9+99MMM:9999999999999999999999999999
99999999999999M+.+99M:99999999999999999999999999999
99999999999999B:.++9M:99999999999999999999999999999
99999999999999B+.+99M:9999AAAAAA9999999999999999999
99999999999999B:.++9M:9AAA++++:+AAA9999999999999999
99999999999999B+.+99M:A+9+A:+++++9AA999999999999999
99999999999999B:.++9:A+@+A:,:++9+A9@M99999999999999
99999999999999B+.+9:A+A,,,,,,+A+A9@A@M9999999999999
99999999999999B:.++A+A+,,.,,+A9A9@A@M@M999999999999
99999999999999B+.+9AA+,,...,++A9@A@A@MM999999999999
99999999999999B:.+:A+++,,.,,++9@A@A@M@M999999999999
99999999999999B+.+A+@+,,,,,+9A@A+@@M@M@M99999999999
99999999999999B:.+A@+++,+,+9A9A++@M@M@MM99999999999
99999999999999B+.+A+@++++++A9A++9M@M@M@M99999999999
99999999999999B:.+A@+@+:+9A9A9A9M@M@M@9M99999999999
0A999999999999B+.+A+@+@+@+@+@A@A@9@9@9@M99999999999
99999999999999B:.+A@+@+@+@+@+@A@M@9@9@9M99999999999
99999999999999B+.+:A@+@+@+@+@A@M@9@9@9M999999999999
99999999999999B:.+:A9@+@+@+@9@A@M@9@9@M999999999999
99999999993333333333M9@9@9@9@9@M@9@9@9M999999999999
99999999993.........MAA99@9@9@M@9@9@9M9999999999999
99999999993...MMMM..MM@9@9@9@9@M@9@9M99999999999999
99999999993....MMM..M:M@9@9@9@9@9@9M999999999999999
99999999993...MMMM..M:9MMM@9@9@9MMM9999999999999999
99999999993..MMM.M..M:9999MMMMMM9999999999999999999
99999999993..MM.....M:99999999999999999999999999999
99999999993..M......M:99999999999999999999999999999
99999999993...M.....MM:9999999999999999999999999999
99999999993.........M9M:999999999999999999999999999
9999999999MMMMMMMMMMMMMM:99999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
99999999999999999999.9999999.9999999999999999999999
9999999....999999999.9999999.99999.999999..99999999
9999999.999.99999999.9999999.99999999999.9999999999
9999999.9999.99...99.9....99....99.9999.99999999999
9999999.9999.9.999.9.9.999.9.999.9.9999....99999999
9999999.9999.9.....9.9.999.9.999.9.9999.999.9999999
9999999.9999.9.99999.9.999.9.999.9.9999.999.9999999
9999999.999.99.999.9.9.999.9.999.9.9999.999.9999999
9999999....9999...99.9....99.999.9.99999...99999999
9999999999999999999999.9999999999999999999999999999
9999999999999999999999.9999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999

Answer 4

tag属性其实没什么实际意义，根据你自己的需要可以用来标示你的控件。

Answer 5

假如有几个Button,每个Button的Tag值不同，判断它的Click事件，可以如下操作Tag是个LongInt值，可以复多种类型的值
begin
 if sender is TButton then
 case (sender as TButton).Tag of
  0:
  ....
  1:
 ...
  2:
...
end;
end;