如何从命令提示符将布尔值传递给 PowerShell 脚本 [英] How to pass boolean values to a PowerShell script from a command prompt

问题描述

我必须从批处理文件中调用 PowerShell 脚本.脚本的参数之一是布尔值:

I have to invoke a PowerShell script from a batch file. One of the arguments to the script is a boolean value:

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -NoProfile -File .\RunScript.ps1 -Turn 1 -Unify $false

命令失败并出现以下错误:

The command fails with the following error:

Cannot process argument transformation on parameter 'Unify'. Cannot convert value "System.String" to type "System.Boolean", parameters of this type only accept booleans or numbers, use $true, $false, 1 or 0 instead.

At line:0 char:1
+  <<<< <br/>
+ CategoryInfo          : InvalidData: (:) [RunScript.ps1], ParentContainsErrorRecordException <br/>
+ FullyQualifiedErrorId : ParameterArgumentTransformationError,RunScript.ps1

截至目前，我在脚本中使用字符串到布尔值的转换.但是如何将布尔参数传递给 PowerShell?

As of now I am using a string to boolean conversion inside my script. But how can I pass boolean arguments to PowerShell?

推荐答案

当使用 -File 参数时，powershell.exe 似乎没有完全评估脚本参数.特别是，$false 参数被视为字符串值，类似于下面的示例:

It appears that powershell.exe does not fully evaluate script arguments when the -File parameter is used. In particular, the $false argument is being treated as a string value, in a similar way to the example below:

PS> function f( [bool]$b ) { $b }; f -b '$false'
f : Cannot process argument transformation on parameter 'b'. Cannot convert value 
"System.String" to type "System.Boolean", parameters of this type only accept 
booleans or numbers, use $true, $false, 1 or 0 instead.
At line:1 char:36
+ function f( [bool]$b ) { $b }; f -b <<<<  '$false'
    + CategoryInfo          : InvalidData: (:) [f], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,f

您可以尝试使用 -Command 而不是使用 -File，它会将调用评估为脚本:

Instead of using -File you could try -Command, which will evaluate the call as script:

CMD> powershell.exe -NoProfile -Command .\RunScript.ps1 -Turn 1 -Unify $false
Turn: 1
Unify: False

作为 大卫 建议，使用 switch 参数也会更惯用，通过消除显式传递布尔值的需要来简化调用:

As David suggests, using a switch argument would also be more idiomatic, simplifying the call by removing the need to pass a boolean value explicitly:

CMD> powershell.exe -NoProfile -File .\RunScript.ps1 -Turn 1 -Unify
Turn: 1
Unify: True

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