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 SqlCredential
            Credential object used to connect to the SQL instance
 
        .PARAMETER EnableException
            By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
            This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
            Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
        .NOTES
            Tags: Hadr, AG, AvailabilityGroup
            Author: Shawn Melton (@wsmelton | http://blog.wsmelton.info)
 
            Website: https://dbatools.io
            Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
            License: MIT https://opensource.org/licenses/MIT
 
        .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,
        [Alias("Credential")]
        [PSCredential]$SqlCredential,
        [Alias('Silent')]
        [switch]$EnableException
    )
    process {
        foreach ($instance in $SqlInstance) {
            try {
                Write-Message -Level Verbose -Message "Connecting to $instance."
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $sqlcredential
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }

            Add-Member -Force -InputObject $server -MemberType NoteProperty -Name ComputerName -value $server.NetName
            Add-Member -Force -InputObject $server -MemberType NoteProperty -Name InstanceName -value $server.ServiceName
            Add-Member -Force -InputObject $server -MemberType NoteProperty -Name SqlInstance -value $server.DomainInstanceName

            Select-DefaultView -InputObject $server -Property 'ComputerName', 'InstanceName', 'SqlInstance', 'IsHadrEnabled'
        }
    }
}