PowerShell写入输出缺少的信息-仅打印第一个对象 [英] PowerShell write-output missing information - prints only 1st object

问题描述

1.ps1具有创建和打印的2个对象.但是输出中只显示一个.在以下情况下，两个对象都会出现:
(1)写输出是通过Format-List
完成的(2)object1具有四个以上的属性(因此它会自动进行垂直格式化)
试图了解这种行为背后的原因.

1.ps1 has 2 objects created and printed. But only one show up in the output. Both objects show up in the following cases:
(1) write-output is done with Format-List
(2) object1 has more than 4 properties (and so it gets vertically formatted automatically)
Trying to understand the reasoning behind this behaviour.

PS C:\> cat .\1.ps1
$object1 = New-Object PSObject
$object1 | add-member NoteProperty -name pn1 -value pv1
$object1 | add-member NoteProperty -name pn2 -value pv2
$object1 | add-member NoteProperty -name pn3 -value pv3
write-output $object1

$object2 = New-Object PSObject
$object2 | add-member NoteProperty -name npn1 -value npv1
$object2 | add-member NoteProperty -name npn2 -value npv2
$object2 | add-member NoteProperty -name npn3 -value npv3
$object2 | add-member NoteProperty -name npn4 -value npv4
$object2 | add-member NoteProperty -name npn5 -value npv5
$object2 | add-member NoteProperty -name npn6 -value npv6
write-output $object2
PS C:\>
PS C:\> .\1.ps1

pn1                                     pn2                                     pn3
---                                     ---                                     ---
pv1                                     pv2                                     pv3


PS C:\>

推荐答案

如果您只是尝试显示信息，则应使用 Write-Host ，而不是 Write-Output .在管道中发送数据时，您想使用 Write-Output ，而不能仅用于显示数据.

If you are just trying to display the information, you should be using Write-Host rather than Write-Output. You want to use Write-Output when you are sending data on in the pipeline, and shouldn't be used to simply display data.

这里是提供更深入答案的帖子:

Here is a post that gives a more in-depth answer: Which should I use: "Write-Host", "Write-Output", or "[console]::WriteLine"?

通过链接:

当您要在管道中发送数据但不一定要在屏幕上显示数据时，应使用写输出.如果没有其他先使用管道，管道最终会将其写入默认值之外.如果要执行相反操作，则应使用Write-Host.[console] :: WriteLine本质上是Write-Host在后台执行的操作.

Write-Output should be used when you want to send data on in the pipe line, but not necessarily want to display it on screen. The pipeline will eventually write it to out-default if nothing else uses it first. Write-Host should be used when you want to do the opposite. [console]::WriteLine is essentially what Write-Host is doing behind the scenes.

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