对Foreach-Object的错误处理

Question

我想做一些类似的事情：

Get-ChildItem "somepath" | where {$_.PSIsContainer} | ForEach-Object{
    #do something if Get-ChildItem didn't receive an error
    #else do something else if did get an error
}

我该怎么做呢？

编辑:我现在有这个：

Get-ChildItem $somelongpath -Recurse -ErrorVariable MyError -ErrorAction Stop  | where {$_.PSIsContainer} | ForEach-Object{
     if($MyError){
        Write-Host "Don't do it"
     } else {
        Write-Host "Yay!"
     }
}

假设$somelongpath是一个超过260限制的路径，因此get-childitem应该收到一个错误并打印“do‘t do it”。但它不是..。这是怎么回事？

Answer 1

您可以组合使用-ErrorAction和-ErrorVariable。似乎以这种方式使用-Recurse会忽略出现错误的目录，所以我编写了一个小的递归函数。

gci -Attributes Directory | Foreach {
    foo $_.FullName
}

function foo
{
    Param ([string] $currentPath)

    Write-Host "Getting subdirectories of" $currentPath

    $result = gci $currentPath -Attributes Directory -ErrorVariable HasError -ErrorAction SilentlyContinue

    if($HasError) { 
        Write-Host "error" $HasError
    }
    else {
        Write-Host "ok"    
    }

    if($result) {
        $result | Foreach {
            foo $_.FullName
        }
    }
}

https://blogs.technet.microsoft.com/heyscriptingguy/2014/07/09/handling-errors-the-powershell-way/