無法綁定參數參數「InputObject」，因爲它是空

我有某些頁面上測量下載時間PowerShell腳本，但是我得到上述錯誤，我不能確定我在做什麼錯無法綁定參數參數「InputObject」，因爲它是空

錯誤

無法將參數綁定到參數'InputObject'，因爲它爲空。

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

來源

2017-10-06 Luis Valencia

你會在哪一行得到錯誤信息？你嘗試調試你的代碼是什麼？ – Clijsters

'Write-Host'後的消息是否有引號？即對於CommonName的'Write-Host'請求平均花了$ AverageResponseTime ms「-ForegroundColor Green' – JohnLBevan

在我剛剛添加到原始問題的最後一行中，我錯過了那個抱歉。 –

@Clijsters給出了正確答案;即問題在於您的$results變量的範圍。

這個答案只是提供了一個有點code review，以幫助您與其他位要向前看。

function Get-ResponseTime { 
    [CmdletBinding()] 
    param (
     [Parameter(Mandatory = $true)] 
     [string]$CommonName 
     , 
     [Parameter(Mandatory = $true)] 
     [string]$URL 
     , 
     [Parameter(Mandatory = $true)] 
     [string]$Environment 
     , 
     [Parameter(Mandatory = $false)] 
     [int]$Times = 5 
    )  
    [System.Int64]$TotalResponseTime = 0 
    [System.Diagnostics.Stopwatch]$stopwatch = New-Object 'System.Diagnostics.Stopwatch' 
    Write-Verbose "Processing URL: $URL" 
    1..$times | foreach-object { 
     [System.Net.WebClient]$Request = New-Object 'System.Net.WebClient' 
     $Request.UseDefaultCredentials = $true 
     Write-Verboset "Call $_ to URL: $URL" 
     $stopwatch.Restart() 
     $PageRequest = $Request.DownloadString($URL) 
     $stopwatch.Stop() 
     $TimeTaken = $stopwatch.Elapsed.TotalMilliseconds 
     $Request.Dispose() 
     $TotalResponseTime += $TimeTaken 
    } 

    $AverageResponseTime = $TotalResponseTime/$Times 
    Write-Verbose "Request to $CommonName took $AverageResponseTime ms on average" 

    $details = @{    
     Date    = get-date    
     AverageResponseTime  = $AverageResponseTime    
     #ResponseTime  = $Destination #this is not declared anywhere/don't know what this field's for 
     Environment = $environment 
    }       
    Write-Output (New-Object 'PSObject' -Property $details) 
    #do you really want a delay here? Doesn't make much sense... may make sense to include a delay in the above loop; i.e. to stagger your tests? 
    #$random = Get-Random -minimum 1 -maximum 30 
    #Start-Sleep -s $random 
} 

#PRODUCTION 
[PSObject[]]$results = @(
    (Get-ResponseTime -commonname 'app homepage' -URL 'https://url1' -environment 'PRODUCTION' -Verbose) 
    ,(Get-ResponseTime -commonname 'department homepage' -URL 'https://url2' -environment 'PRODUCTION' -Verbose) 
) 
$results | Export-Csv -LiteralPath 'c:\so.csv' -NoTypeInformation

使用動名詞函數名（例如Get-Item）。 What is the naming convention for Powershell functions with regard to upper/lower case usage?
使用「Cmdlets」（高級函數）而不是（基本）Functions;他們基本上是一樣的東西，只有[Cmdletbinding()]標籤。這樣做的原因是獲得對諸如詳細輸出等功能的支持。 http://www.lazywinadmin.com/2015/03/standard-and-advanced-powershell.html
使用秒錶來計時處理（您也可以使用measure-command;但任何輸出將被measure-command函數抑制/消耗）。 Timing a command's execution in PowerShell
讓您的cmdlet通過Write-Output將其值輸出到管道中（或者您可以不使用函數名稱;因爲放置一個沒有任何東西來處理它的變量而導致的任何輸出將被饋送到管道;即write-object $a與一行僅由$a組成）。
將輸出捕獲到函數外的$ results變量中，並在那裏處理結果。

來源

2017-10-06 12:32:08 JohnLBevan

完美答案，謝謝 –

回顧上次編輯，似乎$results直接返回$null（由於您的錯誤說）

唯一的線路設置$results是$results += New-Object PSObject -Property $details

這不是在範圍的Export-CSV調用和 - 即使它會，$結果可能爲空，如果此行不被調用。

你應該將它設置爲例如一個ArrayList喜歡如下：

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

，並通過

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

這給你一個ArrayList添加項目 - 即使有它沒有項目 - 這可以很容易地轉化爲CSV等格式。

來源

2017-10-06 12:00:53 Clijsters

無法綁定參數參數「InputObject」，因爲它是空

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