附加到invoke-command中的变量

Question

我需要从Invoke-Command输出变量，但打印时显示为空，以下是示例代码：

$ServiceName = "Service"

Invoke-Command -ScriptBlock {

        try {
            iisreset
            $BodyContent += "Server: <b>$server</b> IIS reset completed<br>"

        }
        catch {
            $BodyContent += "Server: <b>$server</b> is Failed to restart IIS<br>"
            $ErrorStat = 1
        }

        try {
            Stop-Service -DisplayName $using:ServiceName
            $BodyContent += "Server: <b>$server</b> is successfully Stopped $using:ServiceName<br>"
        }
        catch {
            $BodyContent += "Server: <b>$server</b> is failed to Stop $using:ServiceName<br>"
            $ErrorStat = 1
        }

        try {
            Start-Service -DisplayName $using:ServiceName
            $BodyContent += "Server: <b>$server</b> is successfully Started $using:ServiceName<br>"
        }
        catch {
            $BodyContent += "Server: <b>$server</b> is failed to Start $using:ServiceName<br>"
            $ErrorStat = 1
        }

    } -ComputerName $server -Credential $user -ErrorAction Stop

在这里，我想捕获$BodyContent和$ErrorStat

Answer 1

Invoke-Command将打印到管道末尾的内容返回给您。如果你想返回一个变量，你应该像这样Return <variable>：

$ret = Invoke-Command -ScriptBlock { $var="test string"; return $var; }

其中$ret现在包含值test string。

当你想要返回多个变量时，你可以将它们连接成一个变量，例如：

$str1 = "test"
$str2 = "123"
$combinedObjs = New-Object PSObject -Property @{1 = $str1; 2 = $str2}

现在，您可以将它们组合在一起

$ret = Invoke-Command -ScriptBlock { 
  $str1 = "test";
  $str2 = "123";
  $combinedObjs =  @{val1 = $str1; val2 = $str2};
  Return $combinedObjs;
}

现在$ret包含

Name                           Value
----                           -----
val1                           test
val2                           123

您可以通过调用$ret.val1或$ret.val2来访问它们

Answer 2

在给定scriptblock的末尾添加一些输出，例如

    @{  BodyContent = $BodyContent
        ErrorStat   = $ErrorStat
    }

如果你使用例如

$result = Invoke-Command -ScriptBlock { 

    ###  original script block body here

    @{  BodyContent = $BodyContent
        ErrorStat   = $ErrorStat
    }
}  -ComputerName $server -Credential $user -ErrorAction Stop

然后你可以检查

$result.BodyContent
$result.ErrorStat