PowerShell HashTable - self referencing during initialization

Question

I have a theoretical problem - how to reference a hash table during its initialization, for example, to compute a member based other already stated members.

Remove-Variable myHashTable -ErrorAction Ignore
$myHashTable = 
@{
    One = 1
    Two= 2
    Three = ??? # following expressions do not work 
        # $This.One + $This.Two or 
        # $_.One + $_.Two
        # $myHashTable.One + $myHashTable.Two
        # ????
}

$myHashTable.Three -eq 3 # make this $true

Any ideas how to do it? Is it actually possible?

Edit: This was my solution:

$myHashTable = 
@{
    One = 1
    Two= 2
}
$myHashTable.Three = $myHashTable.One + $myHashTable.Two

Answer 1

This won't be possible using the object initializer syntax I'm afraid. While it is possible to use variables, you'll have to compute the values before creating the object.