How to avoid print the garbage info in a Foreach loop?

i write ps script, print out supported logfile types.

  $supportedlogfile=new-object system.collections.generic.list[string]    $moc=get-wmiobject  -class win32_nteventlogfile  foreach($item in $moc)  {     if($item.logfilename -eq $logfilename)     {        $actualsize=$item.filesize/1024        break     }     $supportedlogfile.add($item.logfilename+"`r`n")  }  return $supportedlogfil    applicationhardwareeventsinternet explorerkey management serviceoalertsoperations managersecuritysystemvm managerwindows powershell$item.logfilename$item.logfilename$item.  logfilename$item.logfilename$item.logfilename$item.logfilename$item.logfilename$item.logfilename$item.logfilename$item.logfilenameapplication'r'nhardwareevents'r'ninternet   explorer'r'nkey management service'r'noalerts'r'noperations manager'r'nsecurity'r'nsystem'r'nvm manager'r'nwindows powershell'r'napplication'r'nhardwareevents'r'ninternet   explorer'r'nkey management service'r'noalerts'r'noperations manager'r'nsecurity'r'nsystem'r'nvm manager'r'nwindows powershell'r'napplication  hardwareevents  internet explorer  key management service  oalerts  operations manager  security  system  vm manager  windows powershell     

here got 2 problems:

1. 'break' in foreach loop seemed didn't work

2  how avoid print garbage infos? need just

hardwareevents
internet explorer
key management service
oalerts
operations manager
security
system
vm manager
windows powershell

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thanks, eric

  ps >  get-eventlog -list | select -exp log  application  dfs replication  hardwareevents  internet explorer  key management service  media center  oalerts  security  system  windows powershell  

Windows Server  >  Windows PowerShell