Where对象未筛选

Question

为什么where对象在这种情况下不能工作？

$controlFlowArgs = @{ waitForEnter = $false }
$controlFlowArgs | Format-Table
$controlFlowArgs | Format-List
$result = $controlFlowArgs | Where-Object -FilterScript { $_.Name -eq "waitForEnter" }
$result

输出

Name         Value # Format-Table
----         -----
waitForEnter False
Name  : waitForEnter # Format-List
Value : False
# Missing result would be here

Answer 1

$controlFlowArgs是一个哈希表。你可能应该换一种想法。

$result = $controlFlowArgs | Where-Object { $_["waitForEnter"] }

将把CCD_ 1存储在CCD_。否则，您可以直接使用哈希表：

if ($controlFlowArgs["waitForEnter"]) {
...
}

Answer 2

对象工作正常的地方。在本例中，仅显示"joe"哈希表。令人困惑的是，格式占据了两行。

@{name='joe';address='here'},@{name='john';address='there'} | ? name -eq joe
Name                           Value
----                           -----
name                           joe
address                        here

它仍然被认为是一件事：

@{name='joe';address='here'},@{name='john';address='there'} | ? name -eq joe | 
measure-object | % count
1

如果您想要值本身，请使用foreach对象(或选择object-expandproperty(：

@{name='joe';address='here'},@{name='john';address='there'} | ? name -eq joe | 
% name
joe

通常powershell与pscustomwobjects:一起工作

[pscustomobject]@{name='joe';address='here'},
[pscustomobject]@{name='john';address='there'} | ? name -eq joe
name address
---- -------
joe  here