无法将参数 "address" 转换为值："System.Object[]"，对于 "DownloadString" 类型 "System.Uri"：“无法转换 "System.Object[]"

Question

我需要创建一个脚本来对 3 个不同的环境 url 发出请求，然后为我发送的每个页面生成一个 CSV 文件，其中包含每个环境的平均响应时间。

但是我得到这个错误：

Cannot convert argument "address", with value: "System.Object[]", for "DownloadString" to type "System.Uri": "Cannot convert the "System.Object[]" value of type "System.Object[]" to type "System.Uri".

这是我的代码：

function ResponseTime($CommonName,$URL, $environment) 
{ 
    $Times = 5 
    $i = 0 
    $TotalResponseTime = 0 

    While ($i -lt $Times) { 
        $Request = New-Object System.Net.WebClient 
        $Request.UseDefaultCredentials = $true 
        $Start = Get-Date 
        $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

} 

ResponseTime 'app homepage' 'https://urlproduction', 'PRODUCTION' 
ResponseTime 'app homepage' 'https://urlQA', 'QA' 
ResponseTime 'app homepage' 'https://urltest', 'TEST' 

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

Answer 1

您在 Powershell 中遇到了一个常见的陷阱。认为函数参数在定义中用逗号分隔，函数调用参数不是。如果使用逗号，Powershell 会将此类项目转换为数组。

在此特定情况下

ResponseTime 'app homepage' 'https://urlproduction', 'PRODUCTION'

被解析为

Call function ResponseTime with two parameters:

'app homepage'和'https://urlproduction', 'PRODUCTION'——其中后者是由两个元素组成的数组。

另一方面

ResponseTime 'app homepage' 'https://urlproduction' 'PRODUCTION'

被解析为

Call function ResponseTime with three parameters:

'app homepage'、'https://urlproduction' 和 'PRODUCTION'

无法将参数 "address" 转换为值："System.Object[]"，对于 "DownloadString" 类型 "System.Uri"：“无法转换 "System.Object[]"

Cannot convert argument "address", with value: "System.Object[]", for "DownloadString" to type "System.Uri": "Cannot convert the "System.Object[]"

powershell

powershell-2.0

powershell-3.0