Powershell 在出现错误时不显示其他条件

Question

当我尝试运行脚本时仅触发第一个和第二个条件当我尝试在不存在随机文件夹的情况下尝试“例如 D:\random”时，我收到了错误消息，而不是触发第三个条件“else”

function listChildFolder($folderPath) 
{

    #write your script here
    $folderPath = Read-Host "input"
    
    if ((Get-ChildItem $folderPath) -ne $null)
        { $folderPath| Get-ChildItem |Sort-Object -Property LastWriteTime -Descending |Format-Table name }

    elseif ((Get-ChildItem $folderPath) -eq $null)
        { "Folder Empty" }
    else {"Error: <Error message>"}
        
  
    return 

}

Answer 1

由于 Get-ChildItem 在文件夹路径不存在时抛出终止错误，函数将在那里结束，其余的 elseif 或 else 条件永远不会执行。

我建议在 try{..} catch{..} 中执行此操作，这样您就可以捕获这样的异常：

类似

function listChildFolder {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [string]$folderPath
    )    

    # capture the terminating error message when the path does not exist
    # by specifying -ErrorAction Stop
    try {
        # since we do not add switch '-File' or '-Directory', 
        # the Get-ChildItem cmdlet will return both types
        $filesAndFolders = Get-ChildItem -Path $folderPath -ErrorAction Stop
        # next, find out if we found any files or folders in the path
        # the '@()' forces the $filesAndFolders variable into an array, so we can use the .Count property
        if (@($filesAndFolders).Count) {
            $filesAndFolders | Sort-Object LastWriteTime -Descending | Select-Object Name
        }
        else {
            Write-Host "No files or subfolders found in '$folderPath'"
        }
    }
    catch {
        Write-Warning "Error: $($_.Exception.Message)"
    }
}


$folderPath = Read-Host "Please enter a folder path"
# call the function
listChildFolder $folderPath

^{另一个建议是您使用 PowerShell Verb-Noun 函数命名约定}

根据你说你不能使用 try{..} catch{..} 的评论，当然还有其他方法。

这个怎么样：

function listChildFolder {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [string]$folderPath
    )    

    # test if the given folder path exists
    if (Test-Path -Path $folderPath -PathType Container) {
        # since we do not add switch '-File' or '-Directory', 
        # the Get-ChildItem cmdlet will return both types
        $filesAndFolders = Get-ChildItem -Path $folderPath
        # next, find out if we found any files or folders in the path
        # the '@()' forces the $filesAndFolders variable into an array, so we can use the .Count property
        if (@($filesAndFolders).Count) {
            $filesAndFolders | Sort-Object LastWriteTime -Descending | Select-Object Name
        }
        else {
            Write-Host "No files or subfolders found in '$folderPath'"
        }
    }
    else {
        Write-Warning "Error: '$folderPath' does not exist"
    }
}


$folderPath = Read-Host "Please enter a folder path"
# call the function
listChildFolder $folderPath

Powershell 在出现错误时不显示其他条件

Powershell doesnt shows else condition when get error

powershell