functions/Get-DbaAgHadr.ps1

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function Get-DbaAgHadr {
    <#
  .SYNOPSIS
   Gets the Hadr service setting on the specified SQL Server instance.
 
  .DESCRIPTION
   Gets the Hadr setting, from the service level, and returns true or false for the specified SQL Server instance.
 
  .PARAMETER SqlInstance
   The SQL Server that you're connecting to.
 
  .PARAMETER Credential
   Credential object used to connect to the Windows server itself as a different user
 
  .PARAMETER Silent
   Use this switch to disable any kind of verbose messages
 
  .NOTES
   Tags: DisasterRecovery, AG, AvailabilityGroup
   Author: Shawn Melton (@wsmelton | http://blog.wsmelton.info)
 
   Website: https://dbatools.io
   Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
   License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
  .LINK
   https://dbatools.io/Get-DbaAgHadr
 
  .EXAMPLE
   Get-DbaAgHadr -SqlInstance sql2016
 
   Returns a status of the Hadr setting for sql2016 SQL Server instance.
 #>

    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$Credential,
        [switch]$Silent
    )
    process {
        foreach ($instance in $SqlInstance) {

            try {
                $computer = $instance.ComputerName
                $instanceName = $instance.InstanceName
                $computerName = (Resolve-DbaNetworkName -ComputerName $computer -Credential $Credential).FullComputerName
                Write-Message -Level Verbose -Message "Attempting to connect to $computer"
                $currentState = Invoke-ManagedComputerCommand -ComputerName $computerName -ScriptBlock { $wmi.Services[$args[0]] | Select-Object IsHadrEnabled } -ArgumentList $instanceName -Credential $Credential
            }
            catch {
                Stop-Function -Message "Failure connecting to $computer" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }
            [PSCustomObject]@{
                ComputerName  = $computerName
                InstanceName  = $instanceName
                SqlInstance   = $instance.FullName
                IsHadrEnabled = $currentState.IsHadrEnabled
            }
        }
    }
}