Demo of how to get content from pipeline

PipeLineParamters.ps1

powershell
cls

function testme {
	param(  
		[Parameter(
			Position=0, 
			Mandatory=$true, 
			ValueFromPipeline=$true,
			ValueFromPipelineByPropertyName=$true)
		]
		[String[]]$Message
    ) 	
	begin {
		$elementsProcessed = 0
		write-host "testme called"
	}
	process {
		write-host $message
		$elementsProcessed++
	}
	end {
		write-host ("{0} messages were processed from the pipeline" -f $elementsProcessed)
	}
}

testme 3
5..15 | %{"message #{0:00}" -f $_} | testme

Output:
	PS H:\> testme 3
	testme called
	3
	1 messages were processed from the pipeline
	PS H:\> 5..15 | %{"message #{0:00}" -f $_} | testme
	testme called
	message #05
	message #06
	message #07
	message #08
	message #09
	message #10
	message #11
	message #12
	message #13
	message #14
	message #15
	11 messages were processed from the pipeline
	PS H:\>