Convert hashtable back to string data in efficient way

I am trying to convert a hashtable back to key-value pair in an efficient way. Currently I am using this:

$kv = ""
$hash.GetEnumerator() | ForEach {
  $kv += "$($_.Name)=$($_.Value)"
}

Isn't there any way to directly convert hash table to key value pairs, or I mean string data. There is ConvertFrom-StringData to convert key value pairs to hash table. Isn't there any way to do the opposite, convert hash tables to key value pairs directly?

E.G(Key-Value pair)

a=1
b=2
c=3

I suggested this script cmdlet for this similar question:

function ConvertTo-StringData {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory, Position = 0, ValueFromPipeline)]
        [HashTable[]]$HashTable
    )
    process {
        foreach ($item in $HashTable) {
            foreach ($entry in $item.GetEnumerator()) {
                "{0}={1}" -f $entry.Key, $entry.Value
            }
        }
    }
}

Example:

ConvertTo-StringData $hash 
# or
$hash | ConvertTo-StringData