build.ps1

    [CmdletBinding()]
    Param(
        [Parameter(Position=0,Mandatory=$false,ValueFromRemainingArguments=$true)]
        [string[]]$BuildArguments
    )

    Write-Output "PowerShell $($PSVersionTable.PSEdition) version $($PSVersionTable.PSVersion)"

    Set-StrictMode -Version 2.0; $ErrorActionPreference = "Stop"; $ConfirmPreference = "None"; trap { exit 1 }
    $PSScriptRoot = Split-Path $MyInvocation.MyCommand.Path -Parent

    ###########################################################################
    # CONFIGURATION
    ###########################################################################

    $BuildProjectFile = "$PSScriptRoot\build\_build.csproj"
    $TempDirectory = "$PSScriptRoot\\.tmp"

    $DotNetGlobalFile = "$PSScriptRoot\\global.json"
    $DotNetInstallUrl = "https://raw.githubusercontent.com/dotnet/cli/master/scripts/obtain/dotnet-install.ps1"
    $DotNetChannel = "Current"

    $env:DOTNET_SKIP_FIRST_TIME_EXPERIENCE = 1
    $env:DOTNET_CLI_TELEMETRY_OPTOUT = 1

    ###########################################################################
    # EXECUTION
    ###########################################################################

    function ExecSafe([scriptblock] $cmd) {
        & $cmd
        if ($LASTEXITCODE) { exit $LASTEXITCODE }
    }

    # If global.json exists, load expected version
    if (Test-Path $DotNetGlobalFile) {
        $DotNetGlobal = $(Get-Content $DotNetGlobalFile | Out-String | ConvertFrom-Json)
        if ($DotNetGlobal.PSObject.Properties["sdk"] -and $DotNetGlobal.sdk.PSObject.Properties["version"]) {
            $DotNetVersion = $DotNetGlobal.sdk.version
        }
    }

    # If dotnet is installed locally, and expected version is not set or installation matches the expected version
    if ($null -ne (Get-Command "dotnet" -ErrorAction SilentlyContinue) -and `
     (!(Test-Path variable:DotNetVersion) -or $(& dotnet --version) -eq $DotNetVersion)) {
        $env:DOTNET_EXE = (Get-Command "dotnet").Path
    }
    else {
        $DotNetDirectory = "$TempDirectory\dotnet-win"
        $env:DOTNET_EXE = "$DotNetDirectory\dotnet.exe"

        # Download install script
        $DotNetInstallFile = "$TempDirectory\dotnet-install.ps1"
        New-Item -ItemType Directory -Path $TempDirectory -Force | Out-Null
        (New-Object System.Net.WebClient).DownloadFile($DotNetInstallUrl, $DotNetInstallFile)

        # Install by channel or version
        if (!(Test-Path variable:DotNetVersion)) {
            ExecSafe { & $DotNetInstallFile -InstallDir $DotNetDirectory -Channel $DotNetChannel -NoPath }
        } else {
            ExecSafe { & $DotNetInstallFile -InstallDir $DotNetDirectory -Version $DotNetVersion -NoPath }
        }
    }

    Write-Output "Microsoft (R) .NET Core SDK version $(& $env:DOTNET_EXE --version)"

    ExecSafe { & $env:DOTNET_EXE build $BuildProjectFile /nodeReuse:false }
    ExecSafe { & $env:DOTNET_EXE run --project $BuildProjectFile --no-build -- $BuildArguments }