Public/Import-Excel.ps1
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function Import-Excel { [CmdLetBinding()] [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingPlainTextForPassword", "")] [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSPossibleIncorrectUsageOfAssignmentOperator', '', Justification = 'Intentional')] param ( [Alias('FullName')] [Parameter(ParameterSetName = "PathA", Mandatory, ValueFromPipelineByPropertyName, ValueFromPipeline, Position = 0 )] [Parameter(ParameterSetName = "PathB", Mandatory, ValueFromPipelineByPropertyName, ValueFromPipeline, Position = 0 )] [Parameter(ParameterSetName = "PathC", Mandatory, ValueFromPipelineByPropertyName, ValueFromPipeline, Position = 0 )] [String[]]$Path, [Parameter(ParameterSetName = "PackageA", Mandatory)] [Parameter(ParameterSetName = "PackageB", Mandatory)] [Parameter(ParameterSetName = "PackageC", Mandatory)] [OfficeOpenXml.ExcelPackage]$ExcelPackage, [Alias('Sheet')] [Parameter(Position = 1)] [ValidateNotNullOrEmpty()] [String]$WorksheetName, [Parameter(ParameterSetName = 'PathB' , Mandatory)] [Parameter(ParameterSetName = 'PackageB', Mandatory)] [String[]]$HeaderName , [Parameter(ParameterSetName = 'PathC' , Mandatory)] [Parameter(ParameterSetName = 'PackageC', Mandatory)] [Switch]$NoHeader , [Alias('HeaderRow', 'TopRow')] [ValidateRange(1, 9999)] [Int]$StartRow = 1, [Alias('StopRow', 'BottomRow')] [Int]$EndRow , [Alias('LeftColumn')] [Int]$StartColumn = 1, [Alias('RightColumn')] [Int]$EndColumn , [Switch]$DataOnly, [string[]]$AsText, [string[]]$AsDate, [ValidateNotNullOrEmpty()] [String]$Password, [Int[]]$ImportColumns ) end { $sw = [System.Diagnostics.Stopwatch]::StartNew() if ($input) { $Paths = $input } elseif ($Path) { $Paths = $Path } else { $Paths = '' } function Get-PropertyNames { <# .SYNOPSIS Create objects containing the column number and the column name for each of the different header types. #> [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseSingularNouns', '', Justification = "Name would be incorrect, and command is not exported")] param( [Parameter(Mandatory)] [Int[]]$Columns, [Parameter(Mandatory)] [Int]$StartRow ) try { if ($ImportColumns) { $end = $Worksheet.Dimension.End.Column # Check $ImportColumns if ($ImportColumns[0] -le 0) { throw "The first entry in ImportColumns must be equal or greater 1" ; return } # Check $StartColumn and $EndColumn if (($StartColumn -ne 1) -or ($EndColumn -ne $end)) { Write-Warning -Message "If ImportColumns is set, then individual StartColumn and EndColumn will be ignored." } # Replace $Columns with $ImportColumns $Columns = $ImportColumns } if ($HeaderName) { $i = 0 foreach ($H in $HeaderName) { $H | Select-Object @{N = 'Column'; E = { $Columns[$i] } }, @{N = 'Value'; E = { $H } } $i++ } } elseif ($NoHeader) { $i = 0 foreach ($C in $Columns) { $i++ $C | Select-Object @{N = 'Column'; E = { $_ } }, @{N = 'Value'; E = { 'P' + $i } } } } else { if ($StartRow -lt 1) { throw 'The top row can never be less than 1 when we need to retrieve headers from the worksheet.' ; return } foreach ($C in $Columns) { #allow "False" or "0" to be column headings $Worksheet.Cells[$StartRow, $C] | Where-Object { -not [string]::IsNullOrEmpty($_.Value) } | Select-Object @{N = 'Column'; E = { $C } }, Value } } } catch { throw "Failed creating property names: $_" ; return } } foreach ($Path in $Paths) { if ($path) { $extension = [System.IO.Path]::GetExtension($Path) if ($extension -notmatch '.xlsx$|.xlsm$') { throw "Import-Excel does not support reading this extension type $($extension)" } $resolvedPath = (Resolve-Path $Path -ErrorAction SilentlyContinue) if ($resolvedPath) { $Path = $resolvedPath.ProviderPath } else { throw "'$($Path)' file not found" } $stream = New-Object -TypeName System.IO.FileStream -ArgumentList $Path, 'Open', 'Read', 'ReadWrite' $ExcelPackage = New-Object -TypeName OfficeOpenXml.ExcelPackage if ($Password) { $ExcelPackage.Load($stream, $Password) } else { $ExcelPackage.Load($stream) } } try { #Select worksheet if (-not $WorksheetName) { $Worksheet = $ExcelPackage.Workbook.Worksheets[1] } elseif (-not ($Worksheet = $ExcelPackage.Workbook.Worksheets[$WorksheetName])) { throw "Worksheet '$WorksheetName' not found, the workbook only contains the worksheets '$($ExcelPackage.Workbook.Worksheets)'. If you only wish to select the first worksheet, please remove the '-WorksheetName' parameter." ; return } #region Get rows and columns #If we are doing dataonly it is quicker to work out which rows to ignore before processing the cells. if (-not $EndRow ) { $EndRow = $Worksheet.Dimension.End.Row } if (-not $EndColumn) { $EndColumn = $Worksheet.Dimension.End.Column } $endAddress = [OfficeOpenXml.ExcelAddress]::TranslateFromR1C1("R[$EndRow]C[$EndColumn]", 0, 0) if ($DataOnly) { #If we are using headers startrow will be the header-row so examine data from startRow + 1, if ($NoHeader) { $range = "A" + ($StartRow ) + ":" + $endAddress } else { $range = "A" + ($StartRow + 1 ) + ":" + $endAddress } #We're going to look at every cell and build 2 hash tables holding rows & columns which contain data. #Want to Avoid 'select unique' operations & large Sorts, becuse time time taken increases with square #of number of items (PS uses heapsort at large size). Instead keep a list of what we have seen, #using Hash tables: "we've seen it" is all we need, no need to worry about "seen it before" / "Seen it many times". $colHash = @{ } $rowHash = @{ } foreach ($cell in $Worksheet.Cells[$range]) { if ($null -ne $cell.Value ) { $colHash[$cell.Start.Column] = 1; $rowHash[$cell.Start.row] = 1 } } $rows = ( $StartRow..$EndRow ).Where( { $rowHash[$_] }) $columns = ($StartColumn..$EndColumn).Where( { $colHash[$_] }) } else { $Columns = $StartColumn .. $EndColumn ; if ($StartColumn -gt $EndColumn) { Write-Warning -Message "Selecting columns $StartColumn to $EndColumn might give odd results." } if ($NoHeader) { $rows = $StartRow..$EndRow ; if ($StartRow -gt $EndRow) { Write-Warning -Message "Selecting rows $StartRow to $EndRow might give odd results." } } elseif ($HeaderName) { $rows = $StartRow..$EndRow } else { $rows = (1 + $StartRow)..$EndRow if ($StartRow -eq 1 -and $EndRow -eq 1) { $rows = 0 } } # ; if ($StartRow -ge $EndRow) { Write-Warning -Message "Selecting $StartRow as the header with data in $(1+$StartRow) to $EndRow might give odd results." } } } #endregion #region Create property names if ((-not $Columns) -or (-not ($PropertyNames = Get-PropertyNames -Columns $Columns -StartRow $StartRow))) { throw "No column headers found on top row '$StartRow'. If column headers in the worksheet are not a requirement then please use the '-NoHeader' or '-HeaderName' parameter."; return } if ($Duplicates = $PropertyNames | Group-Object Value | Where-Object Count -GE 2) { throw "Duplicate column headers found on row '$StartRow' in columns '$($Duplicates.Group.Column)'. Column headers must be unique, if this is not a requirement please use the '-NoHeader' or '-HeaderName' parameter."; return } #endregion if (-not $rows) { Write-Warning "Worksheet '$WorksheetName' in workbook '$Path' contains no data in the rows after top row '$StartRow'" } else { #region Create one object per row if ($AsText -or $AsDate) { <#join items in AsText together with ~~~ . Escape any regex special characters... # which turns "*" into "\*" make it ".*". Convert ~~~ to $|^ and top and tail with ^%; So if we get "Week", "[Time]" and "*date*" ; make the expression ^week$|^\[Time\]$|^.*Date.*$ $make a regex for this which is case insensitive (option 1) and compiled (option 8) #> $TextColExpression = '' if ($AsText) { $TextColExpression += '(?<astext>^' + [regex]::Escape($AsText -join '~~~').replace('\*', '.*').replace('~~~', '$|^') + '$)' } if ($AsText -and $AsDate) { $TextColExpression += "|" } if ($AsDate) { $TextColExpression += '(?<asDate>^' + [regex]::Escape($AsDate -join '~~~').replace('\*', '.*').replace('~~~', '$|^') + '$)' } $TextColRegEx = New-Object -TypeName regex -ArgumentList $TextColExpression , 9 } else { $TextColRegEx = $null } foreach ($R in $rows) { #Disabled write-verbose for speed # Write-Verbose "Import row '$R'" $NewRow = [Ordered]@{ } if ($TextColRegEx) { foreach ($P in $PropertyNames) { $MatchTest = $TextColRegEx.Match($P.value) if ($MatchTest.groups.name -eq "astext") { $NewRow[$P.Value] = $Worksheet.Cells[$R, $P.Column].Text } elseif ($MatchTest.groups.name -eq "asdate" -and $Worksheet.Cells[$R, $P.Column].Value -is [System.ValueType]) { $NewRow[$P.Value] = [datetime]::FromOADate(($Worksheet.Cells[$R, $P.Column].Value)) } else { $NewRow[$P.Value] = $Worksheet.Cells[$R, $P.Column].Value } } } else { foreach ($P in $PropertyNames) { $NewRow[$P.Value] = $Worksheet.Cells[$R, $P.Column].Value # Write-Verbose "Import cell '$($Worksheet.Cells[$R, $P.Column].Address)' with property name '$($p.Value)' and value '$($Worksheet.Cells[$R, $P.Column].Value)'." } } [PSCustomObject]$NewRow } #endregion } } catch { throw "Failed importing the Excel workbook '$Path' with worksheet '$WorksheetName': $_"; return } finally { if ($Path) { $stream.close(); $ExcelPackage.Dispose() } } } } } |