Manual launching and handling of IISExpress via command line/launchSettings.json

launch.ps1

param([string]$Config, [string]$Site, [switch]$Child=$false)

if(-not $Child){
  Write-Host "Starting child process"
  $exe = "powershell"
  $args = @("-File `"$($MyInvocation.MyCommand.Definition)`"", "-Config `"$Config`"", "-Site `"$Site`"", "-Child")
  $args
  Start-Process $exe -ArgumentList $args -Wait
}else{
  try{
    $self = Get-CimInstance -Class Win32_Process -Filter "ProcessId = '$PID'"
    $parentPID = $self[0].ParentProcessId
    Write-Host "Child process started, parent id $parentPID"
    Write-Host "Starting site $Site using config $Config"
    $exe = "C:\Program Files\IIS Express\iisexpress.exe"
    $args = @("/config:`"$Config`"", "/site:`"$Site`"")
    $args

    $process = New-Object system.Diagnostics.Process
    $si = New-Object System.Diagnostics.ProcessStartInfo
    $si.FileName = $exe
    $si.Arguments = $args
    $si.UseShellExecute = $false
    $si.RedirectStandardOutput = $true

    $process.StartInfo = $si
    $process.Start() | Out-Null
    $iisPID = $process.Id
    "IIS PID $iisPID"

    $finishRead = $false
    while((Get-Process -PID $parentPID -ErrorAction SilentlyContinue) -ne $null -and -not $process.HasExited){
      if(-not $finishRead){
        $line = $process.StandardOutput.ReadLine()
        Write-Host $line
        if($line -eq "IIS Express is running."){
          $finishRead = $true
        }
      }

      Start-Sleep -Milliseconds 100
    }
    Write-Host "Parent process or IISExpress exited"
    if((Get-Process -PID $iisPID -ErrorAction SilentlyContinue) -ne $null) {
      Write-Host "Killing IISExpress"
      Stop-Process $process
    }else{
      Write-Host "IISExpress not running"
    }
  }catch{
    Write-Host ($_.Exception)
    Write-Host -NoNewLine 'Press any key to continue...';
    $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');
  }
}