PowerShell to resolve MSBuild.exe on VS2017 or VS2015 (or with Build Tools 2015)

msbuild.ps1

function Resolve-MsBuild {
	$msb2017 = Resolve-Path "${env:ProgramFiles(x86)}\Microsoft Visual Studio\*\*\MSBuild\*\bin\msbuild.exe" -ErrorAction SilentlyContinue
	if($msb2017) {
		Write-Host "Found MSBuild 2017 (or later)."
		Write-Host $msb2017
		return $msb2017 | Select-Object -First 1
	}

	$msBuild2015 = "${env:ProgramFiles(x86)}\MSBuild\14.0\bin\msbuild.exe"

	if(-not (Test-Path $msBuild2015)) {
		throw 'Could not find MSBuild 2015 or later.'
	}

	Write-Host "Found MSBuild 2015."
	Write-Host $msBuild2015

	return $msBuild2015
}

$msBuild = Resolve-MsBuild

# e.g. & $msBuild .\Foo.sln