选择Case和OrElse [英] Select Case and OrElse

问题描述

大家好，


''Select Case''构造是否执行逻辑短路，就像

''OrElse''opeartor一样功能类似''或''运算符？


例如：

Dim sTeststr as String

sTeststr =" ABC" ;

选择案例sTeststr

案例ABC，DEF，GHI

....

....

结束选择


sTeststr是否与案例中的所有值相比，无论是否

是否在扫描所有案例值之前找到了值？


kd

解决方案

KD


OrElse的工作方式与VB之外的任何其他语言相似


在第一次评估之后停止真的


我希望这有帮助吗？


Cor

kd写道：< blockquote class =post_quotes>大家好，

'Select Case'构造是否像
''OrElse''opeartor一样执行逻辑短路，还是像''Or''运算符那样运作？

例如：
Dim sTeststr as String
sTeststr =" ABC"
Select Case sTeststr
CaseABC，DEF， GHI
......
...
结束选择

sTeststr与案例中的所有值进行比较，无论是否
是否在扫描所有
案例值之前找到了值？

为什么不自己找出来？


Dim sTeststr as String

sTeststr =" ABC"

Select Case sTeststr

Case" ABC"

MsgBox（与ABC相比）

案例DEF

MsgBox（与DEF相比）

结束选择


-


Riki

感谢Cor的回复。


我想，我没有把问题弄清楚。让我再试一次。


当一个Case块有多个值时，Case变量与所有

的值相比，即使是找到匹配（在完成

案例值的整个列表之前）？换句话说，它是否像

vb.net中的Or运算符一样运行，或者如果找到匹配则扫描中止，（在扫描

整个列表之前）比如OrElse Opeartor？


kd


" Cor Ligthert"写道：

KD
OrElse的工作方式与除VB之外的任何其他语言的OR一样

它在第一次评估后停止是真的

我希望这有帮助吗？

Hi All,

Does ''Select Case'' construct perform logical short-circuiting like the
''OrElse'' opeartor or does it function like the ''Or'' operator?

For Example:
Dim sTeststr as String
sTeststr = "ABC"
Select Case sTeststr
Case "ABC","DEF","GHI"
....
....
End Select

Is sTeststr compared to all the values in the case, irrespective of whether
or not the value is found before scanning through all the case values?

kd

解决方案

KD

The OrElse works like the OR in any other language than VB

It stops after that the first evaluation is true

I hope this helps?

Cor

kd wrote:

Hi All,

Does ''Select Case'' construct perform logical short-circuiting like the
''OrElse'' opeartor or does it function like the ''Or'' operator?

For Example:
Dim sTeststr as String
sTeststr = "ABC"
Select Case sTeststr
Case "ABC","DEF","GHI"
...
...
End Select

Is sTeststr compared to all the values in the case, irrespective of
whether or not the value is found before scanning through all the
case values?

Why not find out yourself?

Dim sTeststr as String
sTeststr = "ABC"
Select Case sTeststr
Case "ABC"
MsgBox("compared to ABC")
Case "DEF"
MsgBox("compared to DEF")
End Select

--

Riki

Thanks Cor for your reply.

I think, I have not framed the question right. Let me give it a try again.

When a Case block, has several values, is the Case variable compared to all
the values, even if a match is found (before completing the entire list of
Case values)? In other words, does it function like the Or Operator in
vb.net, or is the scanning aborted if a match is found, (before scanning the
entire list) like the OrElse Opeartor?

kd

"Cor Ligthert" wrote:

KD

The OrElse works like the OR in any other language than VB

It stops after that the first evaluation is true

I hope this helps?

Cor

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