foreach loop for a complex dictionary is incorrect

Question

I'm using Windows 7 and PowerGUI Script Editor to write a ps1. Here's a part of my codes:

#In global scope
$Type_Trans = "System.Collections.Generic.Dictionary[System.String,PSObject]"
$Type_Farms = "System.Collections.Generic.Dictionary[System.Int32,$Type_Trans]"

$Dic_Counts = New-Object $Type_Farms

#...puts some data in $Dic_Counts here...
#It is no problem with printing out it in console

#Now call the function below
Write-Data $Dic_Counts

Function Write-Data
{
    param(
        $Dic_Counts
    )

    Foreach($Dic_CountsSingle in $Dic_Counts)
    {
        Write-DataSingle $Dic_CountsSingle  #THIS LINE!
    }
}

It's very strange here: why is Dic_CountsSingle not a KeyValuePair, but is just the same as Dic_Counts??

Thank you very much!

Answer 1

Use

foreach ($Dic_CountsSingle in $DicCounts.GetEnumerator())

It's the same for hashtables in PowerShell, too, so not particularly surprising.

Answer 2

I do it like this:

$Dic_Counts.keys | %{ $Dic_Counts[$_]  }