我写了一个函数来检查客户端是在线还是离线，这非常有用！但是，当我尝试使用切换-Remember时，它不会根据需要迭代脚本块$PingCheck，因为测试已经完成一次，但它没有返回{{1 }或$true。
让函数始终输出$false或$true的最佳方法是什么，但不要复制重复的脚本块？
一如既往地感谢您的帮助。
$false答案 0 :(得分：0)
我通过创建一个名为$Script:arrayCanPingResult的额外数组并在脚本块$true中处理false和$PingResult的输出来找到解决方案。
对于每个感兴趣的人，这里是：
# Function to check if $Server is online
Function Can-Ping ($Server,[switch]$SendMail,[switch]$Remember) {
$PingResult = {
# Return $true or $false based on the result from script block $PingCheck
foreach ($_ in $Script:arrayCanPingResult) {
# Write-Host $_
if ($Server -eq $($_.Split(",")[0])) {
# Write-Host "We will return $($_.Split(",")[1])" -ForegroundColor Green
return $($_.Split(",")[1])
}
}
}
$PingCheck = {
$Error.Clear()
if (Test-Connection -ComputerName $Server -BufferSize 16 -Count 1 -ErrorAction 0 -quiet) { # ErrorAction 0 doesn't display error information when a ping is unsuccessful
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Ping test ok" -ForegroundColor Gray; $Script:arrayCanPingResult+=@("$Server,$true"); return
}
else {
$Error.Clear()
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Ping test FAILED" -ForegroundColor Gray
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Flushing DNS" -ForegroundColor Gray
ipconfig /flushdns | Out-Null
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Registering DNS" -ForegroundColor Gray
ipconfig /registerdns | Out-Null
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: NSLookup for $Server" -ForegroundColor Gray
nslookup $Server | Out-Null # Surpressing error here is not possible unless using '2> $null', but if we do this, we don't get $true or $false for the function so '| Out-Null' is an obligation
if (!$?) {
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: NSlookup can't find the hostname, DNS issues or hostname incorrect?" -ForegroundColor Yellow
# Write-Host $Error -ForegroundColor Red
if ($SendMail) {
Send-Mail "FAILED Ping test" "$(Get-TimeStamp) NSlookup can't find $Server, hostname incorrect or DNS issues?" "$error"
}
$script:arrayCanPingError += "ERROR | $(Get-TimeStamp) Ping test failed: NSlookup can't find $Server, hostname incorrect or DNS issues?`n$error"
$script:HTMLarrayCanPingError += "ERROR | $(Get-TimeStamp) Ping test failed:<br>NSlookup can't find $Server, hostname incorrect or DNS issues?<br>$error<br>"
$Script:arrayCanPingResult+=@("$Server,$false")
return
}
else {
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Re-pinging $Server" -ForegroundColor Gray
if (Test-Connection -ComputerName $Server -BufferSize 16 -Count 1 -ErrorAction 0 -Quiet) {
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Ping test ok, problem resolved" -ForegroundColor Gray
$Script:arrayCanPingResult+=@("$Server,$true")
return
}
else {
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: DNS Resolving is ok but can't connect, server offline?" -ForegroundColor Yellow
if ($SendMail) {
Send-Mail "FAILED Ping test" "$error" "DNS Resolving is ok but can't connect to $Server, server offline?"
}
$script:arrayCanPingError += "ERROR Ping test failed: DNS Resolving is ok but can't connect to $Server, server offline?`n$error"
$script:HTMLarrayCanPingError += "ERROR Ping test failed: DNS Resolving is ok but can't connect to $Server, server offline?<br>$error<br>"
$Script:arrayCanPingResult+=@("$Server,$false")
return
}
}
}
}
# Call the scriptblock $PingAction every time, unless the switch $Remember is provided, than we only check each server once
if ($Remember) {
Write-Host "$(Get-TimeStamp) $Server > Function Can-Ping: Switch '-Remember' detected" -ForegroundColor Gray
While ($tmpPingCheckServers -notcontains $Server) {
&$PingCheck
$script:tmpPingCheckServers = @($tmpPingCheckServers+$Server) #Script wide variable, othwerwise it stays empty when we leave the function / @ is used to store it as an Array (table) instaed of a string
}
&$PingResult
}
else {
&$PingCheck
&$PingResult
}
}