Script block to self-elevate a script

self-elevate-script.ps1

# Script found at https://www.autoitscript.com/forum/topic/174609-powershell-script-to-self-elevate/

# Test if admin
function Test-IsAdmin() 
{
    # Get the current ID and its security principal
    $windowsID = [System.Security.Principal.WindowsIdentity]::GetCurrent()
    $windowsPrincipal = new-object System.Security.Principal.WindowsPrincipal($windowsID)
 
    # Get the Admin role security principal
    $adminRole=[System.Security.Principal.WindowsBuiltInRole]::Administrator
 
    # Are we an admin role?
    if ($windowsPrincipal.IsInRole($adminRole))
    {
        $true
    }
    else
    {
        $false
    }
}


# Get UNC path from mapped drive
function Get-UNCFromPath
{
   Param(
    [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
    [String]
    $Path)

    if ($Path.Contains([io.path]::VolumeSeparatorChar)) 
    {
        $psdrive = Get-PSDrive -Name $Path.Substring(0, 1) -PSProvider 'FileSystem'

        # Is it a mapped drive?
        if ($psdrive.DisplayRoot) 
        {
            $Path = $Path.Replace($psdrive.Name + [io.path]::VolumeSeparatorChar, $psdrive.DisplayRoot)
        }
    }

    return $Path
 }


# Relaunch the script if not admin
function Invoke-RequireAdmin
{
    Param(
    [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
    [System.Management.Automation.InvocationInfo]
    $MyInvocation)

    if (-not (Test-IsAdmin))
    {
        # Get the script path
        $scriptPath = $MyInvocation.MyCommand.Path
        $scriptPath = Get-UNCFromPath -Path $scriptPath

        # Need to quote the paths in case of spaces
        $scriptPath = '"' + $scriptPath + '"'

        # Build base arguments for powershell.exe
        [string[]]$argList = @('-NoLogo -NoProfile', '-ExecutionPolicy Bypass', '-File', $scriptPath)

        # Add 
        $argList += $MyInvocation.BoundParameters.GetEnumerator() | Foreach {"-$($_.Key)", "$($_.Value)"}
        $argList += $MyInvocation.UnboundArguments

        try
        {    
            $process = Start-Process PowerShell.exe -PassThru -Verb Runas -Wait -WorkingDirectory $pwd -ArgumentList $argList
            exit $process.ExitCode
        }
        catch {}

        # Generic failure code
        exit 1 
    }
}


# Relaunch if not admin
Invoke-RequireAdmin $script:MyInvocation

# Running as admin if here
$wshell = New-Object -ComObject Wscript.Shell
$wshell.Popup("Script is running as admin", 0, "Done", 0x1) | Out-Null

@tonylea Why not just use a small, never-need-change almost one-liner for self-elevating .ps1 script to Admin and also not forget your current folder/directory:

$Loc = Get-Location
"Security.Principal.Windows" | % { IEX "( [ $_`Principal ] [$_`Identity ]::GetCurrent() ).IsInRole( 'Administrator' )" } | ? {
    $True | % { $Arguments =  @('-NoProfile','-ExecutionPolicy Bypass','-NoExit','-File',"`"$($MyInvocation.MyCommand.Path)`"","\`"$Loc\`"");
    Start-Process -FilePath PowerShell.exe -Verb RunAs -ArgumentList $Arguments; } }

(Get-Location).ToString()
## Any PS code that needs elevation
Read-Host