c# - 如何在 Windows PowerShell 4.0 中执行短路评估？

Question

Technet 的 about_Logical_Operators 关于 Windows PowerShell 4.0 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.

两者似乎都不执行短路评估。

如何在 Windows Powershell 4.0< 中模仿 C# || 或 VB OrElse/strong>?

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