Add-DeviceToCollection.ps1

<#
.DESCRIPTION
  Uses the Configuration Manager module to add device(s) to collection(s)
.PARAMETER MultiAdd
  Use this when adding multiple devices.  Device names must be saved in a text file. 
.PARAMETER CollectionName
  Use this when specifying the Collection Name.  If parameter is not specific, you will be prompted with a list of collections from your environment to pick.
.PARAMETER Computer
  Use this when sepcifying a single device to add.  If paramater is not specific, you will be prompted to enter Computer Name.
.PARAMETER FilePath
  Specify the file path of the text file with device names. If not specified, you will be prompoted to browse and select the text file.

.NOTES
  Version:        1.0
  Author:         Amar Rathore
  Creation Date:  2019-03-01

.EXAMPLE
  Add-DeviceToCollection.ps1 -CollectionName 'Windows 10 Upgrade - Phase 1' -Computer PC01

.EXAMPLE
  Add-DeviceToCollection.ps1 -MultiAdd Yes

.EXAMPLE
  Add-DeviceToCollection.ps1 -FilePath C:\temp\computers.txt
#>

[CmdletBinding()]

Param (
    [ValidateSet ('Yes', 'No')][string]$MultiAdd,
    [string]$CollectionName,
    [string]$Computer,
    [string]$FilePath
)

# Required for SCCM Script
Import-Module "$($ENV:SMS_ADMIN_UI_PATH)\..\ConfigurationManager.psd1"  
$smsClient = New-Object -ComObject Microsoft.SMS.Client -Strict
$siteCode = $smsclient.GetAssignedSite() + ":"
Set-Location $sitecode
# End Import

# Gather collection information
If ($CollectionName -eq '') {
    Write-Host 'Querying collections. Times may vary based on total number of collections.' -ForegroundColor Cyan -BackgroundColor Black
    $CollectionName = (Get-CMDeviceCollection | Select-Object Name | Sort-Object Name | Out-GridView -PassThru -Title 'Select collection:').Name
}
while (!(Get-CMDeviceCollection -Name $CollectionName)) {$CollectionName = Read-Host -Prompt "Incorrect Collection name. Please Enter Collection Name"}

$CollectionId = (Get-CMDeviceCollection -Name $CollectionName).CollectionId
$CollectionMembers = (Get-CMCollectionMember -CollectionName $CollectionName).Name
[int]$Count = 0

Function Add-Machine {    
    If ($CollectionMembers -match $Computer) {
        Write-Host "$Computer is already a memeber of $CollectionName" -ForegroundColor White
    }
    Else {
        Try {
            $ComputerResourceId = (Get-CMDevice -Name $Computer).ResourceId
            Write-Host "-Adding $Computer to" $CollectionName -ForegroundColor Cyan -BackgroundColor Black
            Add-CMDeviceCollectionDirectMembershipRule -CollectionId $CollectionId -ResourceId $ComputerResourceId
            Write-Host "Added $Computer to $CollectionName" -ForegroundColor Green -BackgroundColor Black            
            $Count++                       
        }
        Catch {
            Write-Host "Unable to add" $Computer "to" $CollectionName -ForegroundColor Red -BackgroundColor Black
        }
    }
    return $count    
}

If ($MultiAdd -eq 'Yes' -or $FilePath -ne '') {
    
    If ($FilePath -eq '') {
        [reflection.assembly]::loadwithpartialname("System.Windows.Forms") | Out-Null
        $openFile = New-Object System.Windows.Forms.OpenFileDialog
        $openFile.Filter = "Txt Files (*.txt)|*.txt|All files (*.*)|*.*"
        
        Write-Host "Select the txt file with computer names" -ForegroundColor Cyan -BackgroundColor Black
        Start-Sleep -Seconds 3

        if ($openFile.ShowDialog() -eq "OK") {
            $ComputerList = Get-Content $openFile.FileName
        }
        else { exit }
               
        ($Results = Foreach ($computer in $ComputerList) {Add-Machine}) | ForEach-Object {$Count += $_}
        
        Write-Host "Successfully added $Count machines to $CollectionName" -ForegroundColor Green -BackgroundColor Black
    }
    Else {
        $ComputerList = Get-content $FilePath        
        ($Results = Foreach ($computer in $ComputerList) {Add-Machine}) | ForEach-Object {$Count += $_}        
        Write-Host "Successfully added $Count machines to $CollectionName" -ForegroundColor Green -BackgroundColor Black
    }
}
Else {    
    If ($Computer -eq '') {
        $Computer = Read-Host -Prompt "Enter Machine Name "
    }
    while (!(Get-CMDevice -Name $Computer)) {$Computer = Read-Host -Prompt "Incorrect Machine name. Please Enter Machine Name"}    
    Add-Machine  
}
Set-Location $env:SystemRoot