PowerShell:如何捕获(或抑制)写主机 [英] PowerShell: how to capture (or suppress) write-host

问题描述

我有一个脚本调用a.ps1":

I have a script call "a.ps1":

write-host "hello host"
"output object"

想调用脚本获取输出对象，但也想抑制标准输出:

I want to call the script and obtain the output object, but I also want the standard output to be suppressed:

$result = .\a.ps1
# Don't want anything printed to the console here

有什么提示吗?

推荐答案

确实没有简单的方法可以做到这一点.

There really is no easy way to do this.

一种解决方法是通过定义一个同名的函数来覆盖 Write-Host 的默认行为:

A workaround is to override the default behavior of Write-Host by defining a function with the same name:

function global:Write-Host() {}

这非常灵活.它适用于我上面的简单示例.但是，由于某些未知原因，它不适用于我想申请的真实情况(可能是因为被调用的脚本已签名，出于安全原因，它不允许调用者随意更改行为).

This is very flexible. And it works for my simplistic example above. However, for some unknown reason, it doesn't work for the real case where I wanted to apply (maybe because the called script is signed and for security reasons it doesn't allow caller to arbitrarily change the behavior).

我尝试的另一种方法是通过以下方式修改底层控制台的标准输出:

Another way I tried was to modify the underlying Console's stdout by:

$stringWriter = New-Object System.IO.StringWriter
[System.Console]::SetOut($stringWriter)
[System.Console]::WriteLine("HI") # Outputs to $stringWriter
Write-Host("HI") # STILL OUTPUTS TO HOST :(

但是如您所见，它仍然不起作用.

But as you can see, it still doesn't work.

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