Powershell: Unable to search imported hashtable - powershell

Question

I'm new to Powershell, and this behavior has me stumped.
Let's say I've created a hashtable with the following information:
$hash= #{
California = 'Sacramento';
Washington = 'Olympia';
Oregon = 'Salem';
Alaska = 'Juneau';
}
$hash
Now I want to search for a particular key using a where -match statement:
$result = #($layers.getEnumerator() | ? {$_.key -match 'Cal'})
$result
This returns with California for the key and Sacramento for the value. All is working as it should.
Now, instead of typing in the keys and values for the table, let's say I want to import them into the hashtable using a CSV file:
California,Sacramento
Washington,Olympia
Oregon,Salem
Alaska,Junea
Here is my code I created to import the CSV, which works fine:
Import-Csv C:\Users\hgordon\Desktop\Maps_to_search\junk.csv -Header "Key","Value"
$layers = #{}
Foreach ($key in $keys) {
$layers[$key] = $csv
}
My problem is that when I run my search statement above, it returns nothing.
Why won't the search work on the imported hashtable? Is there something that I need to modify with the import statement? What is the difference between an imported hashtable vs one that is manually typed?
Thanks!
Edit: I've edited my import script as follows to make it clearer:
$t = Import-Csv -Path C:\Users\hgordon\Desktop\Maps_to_search\junk.csv -Header "Key","Value"
$HashTable = #{}
foreach($r in $t)
{
#Write-Host $r.column1 $r.column2
$HashTable[$r.Key] = $r.Value
}
$HashTable
I still get no result from my search script, though.

Answer 1

To get the job done, you need just to get the output of Import-Csv and use it this way:
$layers = Import-Csv "C:\yourfile.csv" -Header "Key","Value"
$result = #($layers | ? {$_.Key -match 'Cal'})
$result
You don't need to create a HashTable.

Answer 2

So in your current iteration, Import-Csv is importing the CSV as a PSCustomObject type. Your Key/Value headers are being used to create a property on the object with an array under each of the CSV, so you end up with:
key value
--- -----
California Sacramento
Washington Olympia
Oregon Salem
Alaska Junea
TypeName: System.Management.Automation.PSCustomObject
Name MemberType Definition
---- ---------- ----------
Equals Method bool Equals(System.Object obj)
GetHashCode Method int GetHashCode()
GetType Method type GetType()
ToString Method string ToString()
key NoteProperty string key=California
value NoteProperty string value=Sacramento
To build your own hashtable from this information, you'd need to merge it yourself:
$HT = #{}
$Csv = Import-Csv ... -Header 'Keys','Values'
For ($i = 0; $i -lt $Csv.Keys.Count; $i++)
{
## Here we're using array-accessors
$HT[$Csv.Keys[$i]] = $Csv.Values[$i]
#alternative
#$HT.($Csv.Keys[$i]) = $Csv.Values[$i]
}