Merged ValidateSet for Encoding and Extension

Export-ExcelSheet.ps1

@@ -0,0 +1,40 @@
+function Export-ExcelSheet {
+
+    [CmdletBinding()]
+    param
+    (
+        [Parameter(Mandatory = $true)]
+        [String]$Path,
+        [String]$OutputPath = '.\',
+        [String]$SheetName,
+        [ValidateSet('ASCII', 'BigEndianUniCode','Default','OEM','UniCode','UTF32','UTF7','UTF8')]
+        [string]$Encoding = 'UTF8',
+        [ValidateSet('.txt', '.log','.csv')]
+        [string]$Extension = '.csv',
+        [ValidateSet(';', ',')]
+        [string]$Delimiter = ';'
+    )
+
+    $Path = (Resolve-Path $Path).Path
+    $xl = New-Object -TypeName OfficeOpenXml.ExcelPackage -ArgumentList $Path
+    $workbook = $xl.Workbook
+
+    $targetSheets = $workbook.Worksheets | Where {$_.Name -Match $SheetName}
+
+    $params = @{} + $PSBoundParameters
+    $params.Remove("OutputPath")
+    $params.Remove("SheetName")
+    $params.Remove('Extension')
+    $params.NoTypeInformation = $true
+
+    Foreach ($sheet in $targetSheets)
+    {
+        Write-Verbose "Exporting sheet: $($sheet.Name)"
+
+        $params.Path = "$OutputPath\$($Sheet.Name)$Extension"
+
+        Import-Excel $Path -Sheet $($sheet.Name) | Export-Csv @params
+    }
+
+    $xl.Dispose()
+}