潜在的简化调整

1. 将数组数据类型显式设置为变量。

2. 创建一个函数并在其中构建New-Item命令，以在执行时根据传递给函数调用的值接受两个参数，以动态构建要创建的路径。

3. 最后，ForEach-Object遍历每个数组，显式定义函数调用的第一个参数，并让第二个参数是每个$_占位符的数组的迭代值（例如 _Main "animals" $_;）。

注意：有些人可能也考虑使用简化%的ForEach-Object别名，所以我在下面的示例 PowerShell 中使用了它，因为您特别询问了简化。

电源外壳

$animals = 'Fox','Wolf','Cat','Cow','Snake','Elephant';
$furniture = 'Chair','Cupboard','Sofa','Table','Bed','Dresser';
$planets = 'Mercury','Venus','Earth','Mars','Jupiter','Saturn';

Function _Main (){
    New-Item "C:\tree\$($args[0])\$($args[1])" -ItemType Directory -Force;
    };

$animals | % { _Main "animals" $_; };
$furniture | % { _Main "furniture" $_; };
$planets  | % { _Main "planets" $_; };

PowerShell（不同的变体）

$animals = 'Fox','Wolf','Cat','Cow','Snake','Elephant';
$furniture = 'Chair','Cupboard','Sofa','Table','Bed','Dresser';
$planets = 'Mercury','Venus','Earth','Mars','Jupiter','Saturn';

Function _Main (){
    New-Item "$($args[0])" -ItemType Directory -Force;
    };

$animals | % { _Main "C:\tree\animals\$_"; };
$furniture | % { _Main "C:\tree\furniture\$_"; };
$planets  | % { _Main "C:\tree\planets\$_"; };

支持资源

• PowerShell 函数

  最基本的函数就是 function 关键字，后跟函数的名称，然后是一对花括号内的一些代码。

  function Add-Numbers {  $args[0] + $args[1] }
  
  PS C:\> Add-Numbers 5 10 
  15
  

• about_Functions

• PowerShell 运算符 $( ) @( ) :: &

• ForEach-对象

  Foreach-Object 的标准别名%：' ' 符号，ForEach

这是@Vomit IT - Chunky Mess Style 的有用方法的替代方法。

这种方法使用哈希表并验证New-Item. 它在结构、动态和可读性方面得到了简化。不是单行/更少的代码。

$basePath = 'C:\tree\'

# a hashtable with a key and value pair
# the key or value could also be a path, see example 'Food\Vegetables' below
$directoryTree = @{
    # Key         = Value(s)
    Animals       = 'Fox', 'Wolf', 'Cat', 'Cow', 'Snake', 'Elephant'
    Furniture     = 'Chair', 'Cupboard', 'Sofa', 'Table', 'Bed', 'Dresser'
    Planets       = 'Mercury', 'Venus', 'Earth', 'Mars', 'Jupiter', 'Saturn'
    'Food\Fruits' = 'Berries\Banana', 'Berries\Watermelon', 'Apple', 'Pineapple'
}

# reset error indicator of New-Item
$newItemCommandError = $null

# loop through the keys. Always use ".psbase." to avoid the hashtable property "Keys" gets overriden by a key named "Keys"
foreach ($directory in $directoryTree.psbase.Keys) {
    # loop through the values of current key
    foreach ($subDirectory in $directoryTree[$directory]) {
        # build full path by concatenating Join-Path via Pipe(s).
        # can be simplified as of PS7+: "Join-Path $basePath $directory $subDirectory"
        $fullPath = Join-Path $basePath $directory | Join-Path -ChildPath $subDirectory
        # ErrorVariable +'newItemCommandError' acts as an indicator for errors
        $null = New-Item $fullPath -ItemType Directory -Force -ErrorVariable +'newItemCommandError'
    }
}

if (-not $newItemCommandError) {
    Write-Host 'All sorted out.'
}

没有注释和结果的相同代码：

$basePath = 'C:\tree\'
$directoryTree = @{
    Animals   = 'Fox', 'Wolf', 'Cat', 'Cow', 'Snake', 'Elephant'
    Furniture = 'Chair', 'Cupboard', 'Sofa', 'Table', 'Bed', 'Dresser'
    Planets   = 'Mercury', 'Venus', 'Earth', 'Mars', 'Jupiter', 'Saturn'
}

$newItemCommandError = $null
foreach ($directory in $directoryTree.psbase.Keys) {
    foreach ($subDirectory in $directoryTree[$directory]) {
        $fullPath = Join-Path $basePath $directory | Join-Path -ChildPath $subDirectory
        $null     = New-Item $fullPath -ItemType Directory -Force -ErrorVariable +'newItemCommandError'
    }
}

if (-not $newItemCommandError) {
    Write-Host 'All sorted out.'
}