Importing large csv file into Excel using PowerShell - excel

Question

I'm writing a script which imports a large csv file in Excel document.
I try to use a faster way to enter the data and pass the array directly to Excel without looping it.
$p = Import-Csv -Path "C:\Report.csv" -Delimiter "`t"
$Excel01 = New-Object -ComObject Excel.Application
$Excel01.Visible = $True
$Workbook01 = $Excel01.Workbooks.Add()
$Worksheet01 = $Workbook01.Sheets.Item(1)
$Worksheet01.Activate()
$Worksheet01.Range("A1:D1").EntireColumn.Value() = $p | select field1,field2...
But when I run this it hungs...How can I do that?

Answer 1

OpenText() already exists in Excel. Note, however, that you MUST change the extension of the text file to something other than .csv, because Excel has its own mind about how files with that particular extension should be handled.
New-Variable -Option Constant -Name xlDelimited -Value 1
New-Variable -Option Constant -Name xlTextQualifierNone -Value -4142
New-Variable -Option Constant -Name xlWorkbookDefault -Value 51
$csv = 'C:\path\to\your.csv'
$txt = $csv -replace '\.csv$','.txt'
$xls = $csv -replace '\.csv$','.xlsx'
Rename-Item $csv $txt
$xl = New-Object -COM 'Excel.Application'
$xl.Workbooks.OpenText($txt, [Type]::Missing, [Type]::Missing, $xlDelimited, $xlTextQualifierNone, $false, $true)
$wb = $xl.Workbooks | ? { $_.FullName -eq $txt }
$wb.SaveAs($xls, $xlWorkbookDefault)
$wb.Close()
$xl.Quit()
The [Type]::Missing values are required for parameters that should retain their default value.

Answer 2

Quick and dirty. Maybe you can optimize it :-)
$p = Import-Csv -Path "C:\Report.csv" -Delimiter "`t"
$Excel01 = New-Object -ComObject Excel.Application
$Excel01.Visible = $True
$Workbook01 = $Excel01.Workbooks.Add()
$Worksheet01 = $Workbook01.Sheets.Item(1)
$Worksheet01.Activate()
#Add csv header to excel
For ($i = 0; $i -lt ($p | Get-Member | Where-Object -FilterScript {$_.MemberType -eq "NoteProperty"}).Count; $i ++) {
$Worksheet01.Cells.Item(1,(1+$i)) = "$(($p | Get-Member | Where-Object -FilterScript {$_.MemberType -eq "NoteProperty"})[$i].Name)"
}
#Add csv data to ecxel
$startRow = 2
For ($i = 0; $i -lt ($p | Measure-Object).Count; $i ++) {
For ($i2 = 0; $i2 -lt ($p[$i] | Get-Member | Where-Object -FilterScript {$_.MemberType -eq "NoteProperty"}).Count; $i2 ++) {
$PropertyName = ($p[$i2] | Get-Member | Where-Object -FilterScript {$_.MemberType -eq "NoteProperty"})[$i2].Name
$Worksheet01.Cells.Item($startRow,(1+$i2)) = "$($p[$i].$PropertyName)"
}
$startRow ++
}