Getting the current hash key in a ForEach-Object loop in powershell

Question

I\'ve got a hash table:

$myHash = @{ 
   \"key1\" = @{
       \"Entry 1\" = \"one\"
       \"Entry 2\" = \"two\"
   }
            


        

Answer 1

I like to use GetEnumerator() when looping a hashtable. It will give you a property value with the object, and a property key with it's key/name. Try:

$myHash.GetEnumerator() | % { 
    Write-Host "Current hashtable is: $($_.key)"
    Write-Host "Value of Entry 1 is: $($_.value["Entry 1"])" 
}

Answer 2

here a similare function i used to read ini file.(the value are also a dictionary like yours).

ini file that i transform into hash look like this

[Section1]

key1=value1
key2=value2

[Section2]

key1=value1
key2=value2
key3=value3

From the ini the hashtable look like this (i passed the fonction that do the transformation in to hash):

$Inihash = @{ 
           "Section1" = @{
               "key1" = "value1"
               "key2" = " value2"
           }
           "Section2" = @{
               "key1" = "value1"
               "key2" = "value2"
         "key3" = "value3"
           }
        }

so from the hash table this line will search all the key/value for a given section:

$Inihash.GetEnumerator() |?{$_.Key -eq "Section1"} |% {$_.Value.GetEnumerator() | %{write-host $_.Key "=" $_.Value}} 

? = for search where-object equal my section name. % = you have to do 2 enumeration ! one for all the section and a second for get all the key in the section.

Answer 3

You can also do this without a variable

@{
  'foo' = 222
  'bar' = 333
  'baz' = 444
  'qux' = 555
} | % getEnumerator | % {
  $_.key
  $_.value
}