Question

我实际上有一个数组$ServerList，其中包含要测试的数组列表，而$ExclusionList是必须排除的服务器列表。

代码应使用Test-Connection测试服务器列表，并将不可达的服务器保存在$nonactivearray中，并将其从$ServerList中删除。之后，它将从$ExclusionList中删除$ServerList中的所有条目。

如果$ServerList变成空数组，它将要求用户键入服务器列表。

在给出正确的服务器之前，代码似乎可以正常工作。我发现，尽管$nonactivearray为空，但$nonactivearray.Count或$nonactivearray.Length返回1，因此由于$ServerList和{{1 }}的元素数大于$nonactivearray。

谢谢，最好。

[编辑]

对不起，我也忘记了在代码顶部添加的以下几行：

# Define function to center the text in the current line (taken from: https://stackoverflow.com/a/48622585/10516690)
function Write-HostCenter {
    param($Message)
    Write-Host ("{0}{1}" -f (' ' * (([Math]::Max(0, $Host.UI.RawUI.BufferSize.Width / 2) - [Math]::Floor($Message.Length / 2)))), $Message)
}

# Define Test-Connection as a string for Invoke-Expression later
[string]$TestConn = "Test-Connection -Quiet -Count 1 -ComputerName "

# Define excluded servers
$ExclusionList = @("Server1","Server2","Server3")

# Save old progress settings
$OldProgress = $ProgressPreference
$ProgressPreference = 'SilentlyContinue'

# Test Server availability
$nonactivearray = @() # Array of unreachable/excluded servers
$nonactive = "" # String to display the unreachable/excluded doscovered in our list of servers. Probably unnecessary, "$nonactivearray" can be used
$i = 0
foreach ($newserver in $ServerList) {
    if (-Not (Invoke-Expression -Command "$TestConn $newserver")) {
        $nonactive += $newserver
        $nonactivearray += $newserver
        if ($i -lt $ServerList.Length) {
            $nonactive += " "
        }
    }
    $i++
}
$ProgressPreference = $OldProgress

# List unreachable and excluded servers
$nonactivearray += (Compare-Object -ReferenceObject $ServerList `
                        -DifferenceObject $ExclusionList `
                        -ExcludeDifferent -IncludeEqual).InputObject
$nonactive = "$nonactivearray"
$CurPosPing = $host.UI.RawUI.CursorPosition
while ($nonactivearray.Length -ge 1) {
    $host.UI.RawUI.CursorPosition = $CurPosPing
    Write-Host "  These HOSTS are not reachable, hence they will be ignored:"
    $TempForegroundColor = $Host.Ui.RawUI.ForegroundColor  # <== Temporary solution
    $Host.Ui.RawUI.ForegroundColor = "Red"                 # <== Temporary solution
    Write-HostCenter $nonactive                            # Write-HostCenter defined in a function. It centers the text in the shell
    $Host.Ui.RawUI.ForegroundColor = $TempForegroundColor  # <== Temporary solution

    # Remove unreachable servers with filters
    $ServerList = $ServerList | Where-Object {$nonactivearray -notcontains $_}

    # Check if the new list is empty
    while ($ServerList.Length -lt 1) {
        Write-Host " "
        $CurPos = $host.UI.RawUI.CursorPosition
        Write-Host "  The list of server is now empty, please type it now.    " -ForegroundColor Yellow
        Write-Host "  Use the comma `"" -NoNewline; Write-Host "," -NoNewline -ForegroundColor Yellow
        Write-Host "`" as a separator (spaces will be ignored)."
        Write-Host " "
        # Get list from user
        # $CurPos = $host.UI.RawUI.CursorPosition
        $ServerList = Read-Host -Prompt "  Server list"
        $ServerList = $ServerList -replace ' ',''
        [string[]]$ServerList = $ServerList -split ','
        $ServerList = $ServerList | Where-Object {$_.length -gt 0}
        while ($ServerList.Length -lt 1) {
            $Host.UI.RawUI.CursorPosition = $CurPos
            Write-Host "  >>> The list is STILL empty, please type it again. <<<      " -ForegroundColor Yellow
            Write-Host " "
            Write-Host " "
            # $CurPos = $host.UI.RawUI.CursorPosition
            $ServerList = Read-Host -Prompt "  Server list"
            $ServerList = $ServerList -replace ' ', ''
            [string[]]$ServerList = $ServerList -split ','
            $ServerList = $ServerList | Where-Object {$_.length -gt 0}
        }
    }
    # Re-check server connectivity
    $OldProgress = $ProgressPreference
    $ProgressPreference = 'SilentlyContinue'
    Write-Host "serverlist"
    $ServerList
    $nonactivearray = @()
    $nonactive = ""
    $i = 0
    foreach ($newserver in $ServerList) {
        if (-Not (Invoke-Expression -Command "$TestConn $newserver")) {
            $nonactive += $newserver
            $nonactivearray += $newserver
            if ($i -lt $ServerList.Length) {
                $nonactive += " "
            }
        }
        $i++
    }
    $ProgressPreference = $OldProgress
    $nonactivearray += (Compare-Object -ReferenceObject $ServerList `
                            -DifferenceObject $ExclusionList `
                            -ExcludeDifferent -IncludeEqual).InputObject
    $nonactive = "$nonactivearray"
}

我希望我不会忘记其他任何事情...

Answer 1

感谢您的帮助。我无法通过提出的解决方案解决问题，但是您给了我寻找解决方案的见识。我搜索了“如何从数组中删除$null值”，然后在另一篇文章中找到了this answer from mklement0。

我尝试了以下方法：

PS N:\> $list = @("1","","3","$null","7")
PS N:\> $list
1

3

7
PS N:\> $list -notlike ''
1
3
7

，然后在我的代码中添加以下行：

$nonactivearray = $nonactivearray -notlike ''

这解决了问题。：）

再次感谢您。

PowerShell-数组长度/计数错误（空时为1）

1 个答案: