如何基于映射向数组元素添加另一个属性

Question

在 Powershell 中我有以下数组

foreach ($Record in $Records)
{ write-host $Record
}

@{car=OPEL; count=3}
@{car=BMW; count=2}
@{car=OPEL; count=8}
@{car=AUDI; count=3}
@{car=FORD; count=5}
@{car=FORD; count=4}
@{car=OPEL; count=4}
@{car=AUDI; count=5}
@{car=BMW; count=3}

我想为数组中的每个元素添加另一个属性，应该是属性“car”的直接映射

car     manufacturer
OPEL    GM
BMW     Bayerishe Motoren Werke
AUDI    Volkswagen group
FORD    FORD Motor Company

以此类推，制造商列表有100多个不同的值，初始数组应该变成

@{car=OPEL; count=3; manufacturer=GM}
@{car=BMW; count=2; manufacturer=Bayerishe Motoren Werke}
@{car=OPEL; count=8; manufacturer=GM}
@{car=AUDI; count=3; manufacturer=Volkswagen group}
@{car=FORD; count=5; manufacturer=FORD Motor Company}
@{car=FORD; count=4; manufacturer=FORD Motor Company}
@{car=OPEL; count=4; manufacturer=GM}
@{car=AUDI; count=5; manufacturer=Volkswagen group}
@{car=BMW; count=3; manufacturer=Bayerishe Motoren Werke}

任何建议如何做到这一点？ 如果数组是有属性的对象呢？

Answer 1

看起来您使用Import-Csv 或其他东西获得了$Records 数组，因为您显示的是一个对象数组。

这里最简单的做法是创建一个查找 Hashtable，将其作为汽车品牌与其制造商之间的映射：

# create a mapping lookup Hashtable
$map = @{
    'OPEL' = 'GM'
    'BMW'  = 'Bayerishe Motoren Werke'
    'FORD' = 'FORD Motor Company'
    'AUDI' = 'Volkswagen Group'
}
# use the $map to add a new property to each of the records
foreach ($Record in $Records){ 
    $Record | Add-Member -MemberType NoteProperty -Name 'manufacturer' -Value $map[$Record.car]
}

现在您可以将此 $Records 数组保存回例如 CSV 文件

$Records | Export-Csv -Path 'X:\CarsAndManufacturers.csv' -NoTypeInformation

在屏幕或 GridView 中显示为表格

$Records | Format-Table -AutoSize  # or: $Records | Out-GridView

或者像以前一样：

foreach ($Record in $Records) { 
    Write-Host $Record
}

表格输出如下：

car  count manufacturer           
---  ----- ------------           
OPEL 3     GM                     
BMW  2     Bayerishe Motoren Werke
OPEL 8     GM                     
AUDI 3     Volkswagen Group       
FORD 5     FORD Motor Company     
FORD 4     FORD Motor Company     
OPEL 4     GM                     
AUDI 5     Volkswagen Group       
BMW  3     Bayerishe Motoren Werke