Public/Set-RegistryValue.ps1

function Set-RegistryValue
{
    <#
        .DESCRIPTION
            Create or modify a registry value
        
        .PARAMETER RegKey
            Specify the registry key path
    
        .PARAMETER Name
            Specify the name of the registry value to modify
    
        .PARAMETER PropertyType
            Specify the type of the registry value
    
        .PARAMETER Value
            Specify the data the value will be set to
    
        .EXAMPLE
            Create or modify a registry value
                Set-RegistryValue -RegKey "HKLM:\SOFTWARE\Example" -Name "ExampleValue" -PropertyType Dword -Value 2
    
            Create of modify a default registry value
                Set-RegistryValue -RegKey "HKLM:\SOFTWARE\Example" -Name '(Default)' -PropertyType String -Value "abcd"
    
        .NOTES
            Created by: Jon Anderson
            Modified: 2023-07-10
    #>

    [CmdletBinding()]
    param(   
        [parameter(Mandatory=$true)][ValidateNotNullOrEmpty()]
        [String]$RegKey,
        [parameter(Mandatory=$true)][ValidateNotNullOrEmpty()]
        [String]$Name,
        [parameter(Mandatory=$true)][ValidateSet('String','ExpandString','Binary','DWord','MultiString','Qword','Unknown')]
        [String]$PropertyType,
        [parameter(Mandatory=$true)][ValidateNotNullOrEmpty()]
        [String]$Value
    )

    Write-LogEntry -Value "Create new registry key: $RegKey\$Name with value: $Value" -Severity 1
    if(!(Test-Path $RegKey))
    {
        try
        {
            New-Item -Path $RegKey -Force | Out-Null
        }
        catch
        {
            Write-LogEntry -Value "Failed to create $RegKey`n$($PSItem.Exception.Message)" -Severity 3
        }
    }
    try
    {
        New-ItemProperty -Path $RegKey -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
    }
    catch
    {
        Write-LogEntry -Value "Failed to set $RegKey\$Name to $Value`n$($PSItem.Exception.Message)" -Severity 3
    }
    if((Get-ItemProperty -Path $RegKey).Name -eq $Value)
    {
        Write-LogEntry -Value "Successfully set $RegKey\$Name to $Value" -Severity 1
    }
}