Question

Technet关于 Windows PowerShell 4.0 的 about_Logical_Operators 声明如下：

Operator     Description                        Example

--------     ------------------------------     ------------------------
-or          Logical or. TRUE when either       (1 -eq 1) -or (1 -eq 2) 
             or both statements are TRUE.       True

-xor         Logical exclusive or. TRUE         (1 -eq 1) -xor (2 -eq 2)
             only when one of the statements    False 
             is TRUE and the other is FALSE.

似乎都没有进行短路评估。

如何在 Windows Powershell 4.0 中模仿 C＃ ||或 VB OrElse？

Answer 1

一组简单的测试用例表明短路有效：

PS C:\> 1 -eq 0 -or $(Write-Host 'foo')
foo
False
PS C:\> 1 -eq 1 -or $(Write-Host 'foo')
True

PS C:\> 1 -eq 1 -and $(Write-Host 'foo')
foo
False
PS C:\> 1 -eq 0 -and $(Write-Host 'foo')
False

Answer 2

我一直在寻找相同的答案。我认为到目前为止最好的...

$cueNumber = 512
@{ $true = "This is true"; $false = "This is false" }[$cueNumber -gt 500]

参考：https://adamtheautomator.com/a-simpler-ifthen-conditional-logic-in-powershell/

如何在Windows PowerShell 4.0中执行短路评估？

2 个答案: