PowerShell调用Get-DistributionGroup部分属性报错问题求助

你遇到的报错是PowerShell属性引用语法错误导致的：
PowerShell 中访问管道当前遍历对象$_的属性，正确语法为$_.属性名，你脚本中将.和_的顺序写反，错误写成了$._属性名：PowerShell 会将$._识别为不存在的变量，后续的ManagedBy、MemberJoinRestriction等字符串会被判定为要执行的命令，因此抛出「未识别为cmdlet/函数名称」的报错。
你单独执行单属性查询时使用了正确的语法，因此没有报错。

针对报错点修正语法后即可正常运行，额外针对多值属性ManagedBy做了字符串拼接优化，避免CSV导出时只显示类型名：

$Groups = Get-DistributionGroup –ResultSize Unlimited
$Groups | ForEach-Object {
    $group = $_.Name
    $primarySMTPAddress = $_.PrimarySMTPAddress
    $managedby = $_.ManagedBy -join ';'
    $memberjoinrestriction = $_.MemberJoinRestriction
    $memberdepartrestriction = $_.MemberDepartRestriction
    $requiresenderauthenticationenabled = $_.RequireSenderAuthenticationEnabled

    Get-DistributionGroupMember $group | ForEach-Object {
        New-Object -TypeName PSObject -Property @{
            Group = $group
            GroupPrimarySMTPAddress = $primarySMTPAddress
            Member = $_.Name
            ManagedBy = $managedby
            MemberJoinRestriction = $memberjoinrestriction
            MemberDepartRestriction = $memberdepartrestriction
            RequireSenderAuthenticationEnabled = $requiresenderauthenticationenabled
            EmailAddress = $_.PrimarySMTPAddress
        }
    }
} | Export-CSV "C:\DistributionGroupinfov1.csv" -NoTypeInformation -Encoding UTF8

内容的提问来源于stack exchange，提问作者Bernke