powershell invoke-command不处理try-catch块

Question

我有以下代码：

$output = foreach ($comp in $maschines.name) {
    invoke-command -computer comp1 -ScriptBlock {
        try
        {
            get-vm –VMName $using:comp | Select-Object VMId | Get-VHD | Select-Object @{ label = "vm"; expression = {$using:comp} }, 
            path,
            VhdType, 
            VhdFormat, 
            @{label = "file(gb)"; expression = {($_.FileSize / 1GB) -as [int]} }, 
            @{label = "size(gb)"; expression = {($_.Size / 1GB) -as [int]} }
        }
        catch
        {
            Write-Host some error
        }
    }
}

而且我没有得到

一些错误

但：

> The operation failed because the file was not found.
>     + CategoryInfo          : ObjectNotFound: (Microsoft.Hyper...l.VMStorageTask:VMStorageTask) [Ge     t-VHD],
> VirtualizationOperationFailedException
>     + FullyQualifiedErrorId : ObjectNotFound,Microsoft.Vhd.PowerShell.GetVhdCommand
>     + PSComputerName        : comp1

我怎样才能得到

一些错误

在cach区块？

Answer 1

为了触发catch块，异常需要终止（PowerShell具有终止和非终止错误）。

要强制cmdlet中的错误终止，可以使用-ErrorAction参数和Stop作为值：

$output = foreach ($comp in $maschines.name) {
    invoke-command -computer comp1 -ScriptBlock {
        try
        {
            get-vm –VMName $using:comp -ErrorAction Stop | Select-Object VMId | Get-VHD | Select-Object @{ label = "vm"; expression = {$using:comp} }, 
            path,
            VhdType, 
            VhdFormat, 
            @{label = "file(gb)"; expression = {($_.FileSize / 1GB) -as [int]} }, 
            @{label = "size(gb)"; expression = {($_.Size / 1GB) -as [int]} }
        }
        catch
        {
            Write-Host some error
        }
    }
}

Answer 2

将-ErrorAction Stop添加到Get-Vm以使其终止。

您可以在PowerShell中阅读有关终止和非终止cmdlet的更多信息：

https://devblogs.microsoft.com/scripting/understanding-non-terminating-errors-in-powershell/

https://devblogs.microsoft.com/powershell/erroraction-and-errorvariable/