powershell哈希表动态键

Question

我想问您有关哈希表（powershell）中的动态嵌套键的问题。我已经做过一些研究，但找不到答案。

# I got this hash structure, works fine
$Hashtable                                              = @{}
$Hashtable.Maincategory                             = @{}
$Hashtable.Maincategory.Subcategory                 = @{}
$Hashtable.Maincategory.Subcategory.MyProperty          = @{ 'property' = 'value'}
$Hashtable.Maincategory.Subcategory.MyProperty

Name                           Value
----                           -----
property                       value



# I want dynamic path to my property
$MainAndSubCategory                                                                = [string]'Maincategory.Subcategory'
$Hashtable.$MainAndSubCategory.MyProperty                                               # doesn't work
$Hashtable."$MainAndSubCategory".MyProperty                                         # doesn't work
$Hashtable."$($MainAndSubCategory)".MyProperty                                       # doesn't work
$Hashtable."$(Get-Variable -Name 'MainAndSubCategory' -ValueOnly)".MyProperty           # doesn't work

我将不胜感激，在此先感谢您。

Answer 1

这将起作用，但是我不确定，如果这是解决方案，那么您正在寻找

$Hashtable.$(($MainAndSubcategory -split '\.')[0]).$(($MainAndSubcategory -split '\.')[1]).myproperty

与将maincategory和subcategory键放入单独的变量中相同

Answer 2

可以构建一个字符串，然后使用Invoke-Expression执行它。请注意，初始的$字符已转义。

$Hashtable                                     = @{}
$Hashtable.Maincategory                        = @{}
$Hashtable.Maincategory.Subcategory            = @{}
$Hashtable.Maincategory.Subcategory.MyProperty = @{ 'property' = 'value'}
$Hashtable.Maincategory.Subcategory.MyProperty

$MainAndSubCategory = 'Maincategory.Subcategory'
Invoke-Expression -Command "`$Hashtable.$MainAndSubCategory.MyProperty"