Passing parameter variables into Invoke-Command

I am trying to build a tool to stop and restart services on remote computers, but I want to choose a specific service.  I can't get the $Service parameter to pass to the command.

Any Ideas?

function Restart-rService {

        [CmdletBinding()]

        Param(

            [Parameter()]

            [string[]]$computername = "loclhost",

            $Credential = (Get-Credential -UserName 'dom\User01'-Message "Any Service Remote"),

            [string]$Service = ''

        )

  $command = { Restart-Service -name }

Invoke-Command -ComputerName $computername -Credential $Credential -ScriptBlock $command -ArgumentList $Service

}

Restart-rService -computername tserver -service 'DHCP'

Missing an argument for parameter 'Name'. Specify a parameter of type 'System.String[]' and try again.

    + CategoryInfo          : InvalidArgument: (:) [Restart-Service], ParameterBindingException

    + FullyQualifiedErrorId : MissingArgument,Microsoft.PowerShell.Commands.RestartServiceCommand

    + PSComputerName        : tserver