Multiple csv files into a xlsx file but different sheets using powershell

Question

I have 20 csv files. Each are unrelated. How do I combine them together into one xlsx file with 20 sheets, each named after the csv files.

$root = "C:\Users\abc\Desktop\testcsv"
$CSVfiles = Get-ChildItem -Path $root -Filter *.csv

$xlsx = "C:\Users\abc\Desktop\testxl.xlsx" #output location
$delimiter = "," #delimiter

#Create a excel
$xl=New-Object -ComObject Excel.Application
$xl.Visible=$true
#add a workbook
$wb=$xl.WorkBooks.add(1)

ForEach ($csv in $CSVfiles){

    #name  the worksheet
    $ws=$wb.WorkSheets.item(1)
    $ws.Name = [io.path]::GetFileNameWithoutExtension($csv)

    $TxtConnector = ("TEXT;" + $csv)
    $Connector = $ws.QueryTables.add($TxtConnector,$ws.Range("A1"))
    $query = $ws.QueryTables.item($Connector.name)
    $query.TextFileOtherDelimiter = $delimiter
    $query.TextFileParseType  = 1
    $query.TextFileColumnDataTypes = ,1 * $ws.Cells.Columns.Count
    $query.AdjustColumnWidth = 1

    # Execute & delete the import query
    $query.Refresh()
    $query.Delete()
    $wb.SaveAs($xlsx,51)
}
# Save & close the Workbook as XLSX.
$xl.Quit()

Answer 1

This way, change the first line to the folder where you store those 20 CSV files and then

$path="c:\path\to\folder" #target folder
cd $path;

$csvs = Get-ChildItem .\* -Include *.csv
$y=$csvs.Count
Write-Host "Detected the following CSV files: ($y)"
foreach ($csv in $csvs)
{
Write-Host " "$csv.Name
}
$outputfilename = $(get-date -f yyyyMMdd) + "_" + $env:USERNAME + "_combined-data.xlsx" #creates file name with date/username
Write-Host Creating: $outputfilename
$excelapp = new-object -comobject Excel.Application
$excelapp.sheetsInNewWorkbook = $csvs.Count
$xlsx = $excelapp.Workbooks.Add()
$sheet=1

foreach ($csv in $csvs)
{
$row=1
$column=1
$worksheet = $xlsx.Worksheets.Item($sheet)
$worksheet.Name = $csv.Name
$file = (Get-Content $csv)
foreach($line in $file)
{
$linecontents=$line -split ',(?!\s*\w+")'
foreach($cell in $linecontents)
{
$worksheet.Cells.Item($row,$column) = $cell
$column++
}
$column=1
$row++
}
$sheet++
}
$output = $path + "\" + $outputfilename
$xlsx.SaveAs($output)
$excelapp.quit()
cd \ #returns to drive root

Answer 2

https://stackoverflow.com/a/51094040/5995160 answer is too slow when dealing with csv's with a ton of data, I modified this solution to use https://github.com/dfinke/ImportExcel. This has greatly improved the performance of this task, at least for me.

Install-Module ImportExcel -scope CurrentUser
$csvs = Get-ChildItem .\* -Include *.csv
$csvCount = $csvs.Count
Write-Host "Detected the following CSV files: ($csvCount)"
foreach ($csv in $csvs) {
    Write-Host " -"$csv.Name
}

$excelFileName = $(get-date -f yyyyMMdd) + "_" + $env:USERNAME + "_combined-data.xlsx"
Write-Host "Creating: $excelFileName"

foreach ($csv in $csvs) {
    $csvPath = ".\" + $csv.Name
    $worksheetName = $csv.Name.Replace(".csv","")
    Write-Host " - Adding $worksheetName to $excelFileName"
    Import-Csv -Path $csvPath | Export-Excel -Path $excelFileName -WorkSheetname $worksheetName
}

This solution assumes that the user has already changed directories to where all the csv's live.

Answer 3

See below for a solution with uses the OpenText method.

At least two things to note:

• I'm assuming your workbook creates a single sheet by default. if creates more than that, you will need to modify the script so that these additional sheets are deleted from the end result.

• The way you specify TextFileColumnDataTypes is quite clever. You will need to modify it and feed the array to the FieldInfo argument below. See the documentation linked above for the kind of array it is expecting.

---

$CSVfiles = Get-ChildItem -Path $root -Filter *.csv

$xlsx = "C:\Users\abc\Desktop\testxl.xlsx" #output location

#Create a excel
$xl = New-Object -ComObject Excel.Application

$xl.Visible=$true

#add a workbook
$wb = $xl.WorkBooks.add(1)

# how many worksheets do you have in your original workbook? Assuming one:
$ws = $wb.Worksheets.Item(1)

ForEach ($csv in $CSVfiles){

    # OpenText method does not work well with csv files
    Copy-Item -Path $csv.FullName -Destination ($csv.FullName).Replace(".csv",".txt") -Force

    # Use OpenText method. FieldInfo will need to be amended to suit your needs
    $xl.WorkBooks.OpenText(`
                    ($file.FullName).Replace(".csv",".txt"),    # Filename
                    2,                 # Origin
                    1,                 # StartRow
                    1,                 # DataType
                    1,                 # TextQualifier
                    $false,            # ConsecutiveDelimiter
                    $false,            # Tab
                    $false,            # Semicolon
                    $true,             # Comma
                    $false,            # Space
                    $false,            # Other
                    $false,            # OtherChar
                    @()                # FieldInfo
    )

    $tempBook   = $xl.ActiveWorkbook

    $tempBook.worksheets.Item(1).Range("A1").Select()         | Out-Null
    $tempBook.worksheets.Item(1).Move($wb.Worksheets.Item(1)) | Out-Null

    # name  the worksheet
    $xl.ActiveSheet.Name = $csv.BaseName

    Remove-Item -Path ($csv.FullName).Replace(".csv",".txt")  -Force

}

$ws.Delete()

# Save & close the Workbook as XLSX.
$wb.SaveAs($xlsx,51)
$wb.Close()

$xl.Quit()