Adding Sql Server agent service logon as administrator to SSAS

In this Power Shell script I will explain how we can add SQL server agent service logon to SSAS administrator group

Function Add-SqlServiceLogonAccount
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory=$true)]
        [string] $SqlServerInstance = $env:computername,
        [parameter(Mandatory=$true)]
        [string]  $AnalysisServerInstance,
        $ComputerName = $env:computername
    )
        try
        {
            $ValidAnalysis = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.AnalysisServices") | Out-String

            if([string]::IsNullOrWhitespace($ValidAnalysis))
            {
                throw "Unable to find either Microsoft.AnalysisServices.AdomdClient or Microsoft.AnalysisServices in GAC"
            }

            $SqlInstance =  $SqlServerInstance.Split("\")
            #Getting the required SQL services running for both default localhost and as well for new Instances
            if($SqlServerInstance -match "\\")
            {
                $SqlInstance = "SQLAgent`$$($SqlInstance[1])"
            }
            else
            {
                $SqlInstance = "SQLSERVERAGENT"
                $SqlServiceDetails = Get-WmiObject -Class Win32_Service -ComputerName $ComputerName |
                               select name,DisplayName, StartName, State |
                               Where {$_.name -eq "$SqlInstance"  -and $_.State -eq "Running" }          
            }

            [string]$loginName = [string]::Empty

            if($SqlServiceDetails -ne $null)
            {
                if($SqlServiceDetails.Name -eq $SqlInstance)
                {
                    $loginName = $SqlServiceDetails.StartName
                }
            }

            if(![string]::IsNullOrWhitespace($loginName))
            {
                $Targetserver = new-Object Microsoft.AnalysisServices.Server
                $Targetserver.Connect($AnalysisServerInstance)

                #Getting members under the role Administrators
                $administrators = $Targetserver.Roles["Administrators"]
                #checking for the existence of loginname, if not exists adding member to Administrators group
                if ($administrators.Members.Name -notcontains $loginName) {
                    Write-Host "Adding the agent logon account $loginName to the Administrators group"
                    $administrators.Members.Add($loginName) | Out-Null
                    $administrators.Update()
                    Write-Host "Adding the agent logon account $loginName to the Administrators group"
                }
                else
                {
                    Write-Verbose "$loginName was already added to the Administrators group"
                }
                $Targetserver.Disconnect()
            }
        }
        catch
        {
            throw $_.Message
        }
    }
}