powershell - 无法将参数绑定(bind)到参数 'InputObject'，因为它为空

Question

我有一个 powershell 脚本可以测量某些页面的下载时间，但是我收到上面的错误，我不确定我做错了什么

错误是

Cannot bind argument to parameter 'InputObject' because it is null.

function ResponseTime($CommonName,$URL, $environment) 
{ 
    $Times = 5
    $i = 0 
    $TotalResponseTime = 0 
      Write-HOst $URL
    While ($i -lt $Times) { 
        $Request = New-Object System.Net.WebClient 
        $Request.UseDefaultCredentials = $true 
        $Start = Get-Date 
        Write-HOst $URL
        $PageRequest = $Request.DownloadString($URL) 
        $TimeTaken = ((Get-Date) - $Start).TotalMilliseconds 
        $Request.Dispose() 
        $i ++ 
        $TotalResponseTime += $TimeTaken 
    } 

    $AverageResponseTime = $TotalResponseTime / $i 
    Write-Host Request to $CommonName took $AverageResponseTime ms in average -ForegroundColor Green 

    $details = @{            
        Date             = get-date              
        AverageResponseTime     = $AverageResponseTime              
        ResponseTime      = $Destination 
        Environment = $environment
    }                           
    $results += New-Object PSObject -Property $details
    $random = Get-Random -minimum 1 -maximum 30
    Start-Sleep -s $random
} 

#PRODUCTION
ResponseTime -commonname 'app homepage' -URL 'https://url1' -environment 'PRODUCTION'
ResponseTime -commonname 'department homepage' -URL 'https://url2' -environment 'PRODUCTION'

$results | export-csv -Path c:\so.csv -NoTypeInformation

Answer 1

查看您上次的编辑，似乎 $results 只是返回 $null (正如您的错误所述)

唯一的行设置$results是$results += New-Object PSObject -Property $details

它不在您的 Export-CSV 调用范围内，即使在范围内，如果未调用此行，$results 也可能为空。

恕我直言，您应该将其设置为例如一个ArrayList如下:

$results = New-Object -TypeName System.Collections.ArrayList

并通过

添加项目

$times = ResponseTime -commonname '' #etc
$results.Add($times) | Out-Null

这将为您提供一个 ArrayList - 即使其中没​​有任何项目 - 也可以轻松将其转换为 CSV 和其他格式。