Export csv via pscustomobject displaying incorrectly powershell - arrays

Question

I have the following code:
function realtest
{
$files = Get-ChildItem -Path 'D:\data\' -Filter *.csv
$tester = [PSCustomObject]#{
foreach ($file in $files)
{
$tempName = $file.BaseName
$temp = Import-Csv $file
$tester | Add-Member -MemberType NoteProperty -Name $tempName -Value $temp.$tempName
}
$tester
$tester | Export-Csv "D:\result.csv" -NoTypeInformation
}
I am trying to export a bunch of data to CSV however when it is display the data on csv it is shown as below
"E0798T102","E0798T103"
"System.Object[]","System.Object[]"
but when i do it as a print on console it displays as the below
E0798T102 E0798T103
--------- ---------
{0, 0, 0, 0...} {0, 0, 0, 0...}
Ultimately, I want E0798T102 and E0798T103 as seperate columns in the result.csv
just to note, I will have 50 csv to loop through and each should display as its own column

Answer 1

Here is an incredibly inefficient answer to your question. If left as is, it assumes your CSV files already have a header with the CSV file basename:
$CSVs = Get-ChildItem -path 'D:\data\' -filter "*.csv" -file
$headers = $CSVs.basename
$table = [System.Data.DataTable]::new("Files")
foreach ($header in $headers) {
$table.Columns.Add($header) | out-null
}
foreach ($CSV in $CSVs) {
#$contents = Import-Csv $CSV -Header $CSV.basename # If CSV has no header
$contents = Import-Csv $CSV # If CSV contains header
$rowNumber = 0
foreach ($line in $Contents) {
$rowcount = $table.rows.count
if ($rowNumber -ge $rowCount) {
$row = $table.NewRow()
$row[$CSV.basename] = $line.$($CSV.basename)
$table.Rows.Add($row)
}
else {
$row = $table.rows[$rowNumber]
$row[$CSV.basename] = $line.$($CSV.basename)
}
$rowNumber++
}
}
$table | Export-Csv output.csv -NoTypeInformation
You can uncomment the commented $contents line if your CSV files do not have a header. You will just have to comment out the next $contents variable assignment if you uncomment the first.

Answer 2

Based on your snippet, this can be significantly simplified:
function Get-Csv {
$col = foreach ($file in Get-ChildItem -Path D:\data -Filter *.csv) {
$csv = Import-Csv -Path $file.FullName
[pscustomobject]#{
$csv.($file.BaseName) = $csv
}
}
$col | Export-Csv D:\result.csv -NoTypeInformation
return $col
}
However, a csv file seems like the wrong approach because you're trying to embed objects under a header. This doesn't really work in a tabular format as you only get one layer of depth. You should either expand all the properties on your objects, or use a different format that can represent depth, like json.
The reason for your formatting woes is due to how the serialization works. You're getting a string representation of your objects.
Converting to json isn't difficult, you just trade your Export-Csv call:
$col | ConvertTo-Json -Depth 100 | Out-File -FilePath D:\result.json
Note: I specify -Depth 100 because the cmdlet's default Depth is 2.