如何摆脱@{Alias=}？

Question

我遇到一个问题，我有以下的结果，我不知道如何寻求帮助，以解决它自己.

[PS] C:\Windows\system32>$Usernames | ForEach-Object {Add-MailboxPermission -Identity "XXXXXX" -User "DOMAIN\$_" -Accessright Fullaccess -InheritanceType all -whatif}

User or group "DOMAIN\@{Alias=XXXXXXX}" wasn't found. Please make sure you've typed it correctly.
    + CategoryInfo          : InvalidData: (:) [Add-MailboxPermission], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : 2BB02DBA,Microsoft.Exchange.Management.RecipientTasks.AddMailboxPermission
    + PSComputerName        : XXXXXXXXXX

如何删除@{Alias=}？我要一个普通的用户名..。

[PS] C:\Windows\system32>$Usernames | Get-Member


   TypeName: Selected.Microsoft.Exchange.Data.Directory.Management.ReducedRecipient

Name        MemberType   Definition
----        ----------   ----------
Equals      Method       bool Equals(System.Object obj)
GetHashCode Method       int GetHashCode()
GetType     Method       type GetType()
ToString    Method       string ToString()
Alias       NoteProperty System.String Alias=XXXXXX

Answer 1

显然，$Usernames包含带有属性Alias的对象。在将项传递到循环之前展开该属性：

$Usernames | Select-Object -Expand Alias | ForEach-Object { ... }

或者使用子表达式获取用户名字符串中的属性值：

$Usernames | ForEach-Object {
  Add-MailboxPermission -Identity "XXXXXX" -User "DOMAIN\$($_.Alias)" ...
}