Question

如何在以下数组的前两列（a，b）和（c，e）上使用Group-Object？

$a = @('a','b','x',10), 
@('a','b','y',20), 
@('c','e','x',50), 
@('c','e','y',30)

Answer 1

Group-Object接受匿名计算的属性，代替属性名称：

PS C:\> $a | Group-Object @{ Expression={$_[0]} },@{ Expression = {$_[1]} }

它还接受ScriptBlock：

PS C:\> $a | Group-Object {$_[0]},{$_[1]}

只要表达式可以计算为字符串：

PS C:\> Get-Help Group-Object -Parameter Property

-Property [<Object[]>]
    Specifies the properties for grouping. The objects are arranged into groups 
    based on the value of the specified property.

    The value of the Property parameter can be a new calculated property. 
    To create a calculated, property, create a hash table with an Expression key
    that specifies a string or script block value.

数组上的Group-Object？

1 个答案: