How do I get get-childitem to filter on multiple file types?

Question

I'm trying to get a list of all the XSL and XSLT files in a directory.

dir -recurse -filter *.xsl,*.xslt -name

But the following error:

Get-ChildItem : Cannot convert 'System.Object[]' to the type 'System.String' required by parameter 'Filter'. Specified method is not supported.

dir -recurse -filter *.xsl -filter *.xslt -name

But got this error:

Get-ChildItem : Cannot bind parameter because parameter 'Filter' is specified more than once. To provide multiple values to parameters that can accept multiple values, use the array syntax. For example, "-parameter value1,value2,value3".

Can I list both file extensions with a single command?

Answer 1

dir .\* -include ('*.xsl', '*.xslt') -recurse