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如何在(after pipeline)ForEach Object cmdlet中实现if语句?

powershell-4.0 powershell-3.0 powershell

WebsGhost · 技术社区 · 7 年前

这里有人帮我编写了一些代码并编写了这个脚本(我原来的脚本有一些问题)。

现在我需要实现一个 if 此内的语句 ForEach-Object (如果其中一台服务器不存在,则执行类似操作 Write-Host "blah blah" )而不停止 try / catch 此处不适合。

下面是代码(我尝试过使用它,但没有成功)。

$computers = "localhost"
foreach ($pc in $computers) {
    $test_netconnection = Test-NetConnection $pc -Port 1433
    Test-Connection -ComputerName $pc -Count 2 -Quiet | ForEach-Object {
        [PSCustomObject]@{
            LocalPC          = $_.PSComputerName
            'Tested-Server'  = $test_netconnection.ComputerName
            Bytes            = $_.buffersize
            Time             = $_.ResponseTime
            RemotePort       = $test_netconnection.RemotePort
            TcpTestSucceeded = $test_netconnection.TcpTestSucceeded
        }
    }
}

这是网络上计算机的正确输出

LocalPC Tested-Server Bytes Time RemotePort TcpTestSucceeded
------- ------------- ----- ---- ---------- ----------------
LEVL-01 localhost        32    0       1433            False
LEVL-01 localhost        32    0       1433            False

这是不在网络上的计算机的输出

    test-Connection : Testing connection to computer 'localh0st' failed: No such host is known
   servers\Foreach-object.ps1:9 char:5
    +     test-Connection -ComputerName $pc -Count 2 |
    +     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        + CategoryInfo          : ResourceUnavailable: (localh0st:String) [Test-Connection], PingException
        + FullyQualifiedErrorId : TestConnectionException,Microsoft.PowerShell.Commands.TestConnectionCommand

我需要让它显示“计算机未联机”,而不是红色错误,而第一个输出保持不变,这就是为什么我尝试实现“IF”循环

非常感谢你的帮助

1 回复 | 直到 7 年前

Ansgar Wiechers 7 年前

在我看来 try / catch 会的 确切地 您的问题:

try {
    Test-Connection -Computer $pc -Count 2 -EA Stop | ForEach-Object {
        [PSCustomObject]@{
            LocalPC          = $env:COMPUTERNAME
            'Tested-Server'  = $pc
            Bytes            = $_.buffersize
            Time             = $_.ResponseTime
            RemotePort       = $test_netconnection.RemotePort
            TcpTestSucceeded = $test_netconnection.TcpTestSucceeded
        }
    }
} catch {
    "The computer $pc is not online."
}

然而,就个人而言,我更喜欢保持可ping主机和不可ping主机的输出格式相同(增加一列用于“在线”状态)。用于该用途 -ErrorAction SilentlyContinue 要抑制错误,请收集 Test-Connection 在变量中,然后根据该变量是否为空来构建自定义对象。

$test_connection = Test-Connection -Computer $pc -Count 2 -EA SilentlyContinue
if ($test_connection) {
    $test_connection | ForEach-Object {
        [PSCustomObject]@{
            LocalPC          = $env:COMPUTERNAME
            'Tested-Server'  = $pc
            Online           = $true
            Bytes            = $_.buffersize
            Time             = $_.ResponseTime
            RemotePort       = $test_netconnection.RemotePort
            TcpTestSucceeded = $test_netconnection.TcpTestSucceeded
        }
    }
} else {
    [PSCustomObject]@{
        LocalPC          = $env:COMPUTERNAME
        'Tested-Server'  = $pc
        Online           = $false
        Bytes            = $null
        Time             = $null
        RemotePort       = $test_netconnection.RemotePort
        TcpTestSucceeded = $test_netconnection.TcpTestSucceeded
    }
}

作为补充说明,我不建议使用派生信息( $_.PSComputerName ,则, $test_netconnection.ComputerName )有原始信息的地方( $env:COMPUTERNAME ,$pc`)。