Test-RegValue Function

Powershell has a great CMDLET called Test-Path that can check to see if a registry key exists but unfortunately it does not have the ability to check for registry values. In order to get around this, I created the following function to check to see if a registry value exists. This can be extremely useful when you are using a registry key to verify if a script has already executed in the past.

Examples:
Test-RegValue -Key “HKCU:\Control Panel\Desktop” -Value WallPaper
Test-RegValue -Key “HKLM:\SOFTWARE\Custom” -Value Test

Function Test-RegValue {
    <#
    .SYNOPSIS
    Determine if a registry value exists

    .PARAMETER Key
    Provide registry key path

    .PARAMETER Value
    Provide registry value that you would like to test

    .EXAMPLE
    Test-RegValue -Key "HKCU:\Control Panel\Desktop" -Value WallPaper

    .EXAMPLE
    Test-RegValue -Key "HKLM:\SOFTWARE\Custom" -Value Test
    #>
    param (
     [parameter(Mandatory=$true)]
     [ValidateNotNullOrEmpty()]$Value,
     [parameter(Mandatory=$true)]
     [ValidateNotNullOrEmpty()]$Key
    )

    $ValueExist = (Get-ItemProperty $Key).$Value -ne $null
    Return $ValueExist
}

Post your questions in the comments below!