Powershell：在 applicationHost.config 中查找 allowedServerVariables 检查重复项的脚本

Question

我正在尝试添加一个新的服务器变量

Add-WebConfiguration /system.webServer/rewrite/allowedServerVariables -atIndex 0 -value @{name="HTTP_COOKIE"}

但我收到以下错误

Add-WebConfigurationProperty : Filename: 
Error: Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'Test'
At line:1 char:1
+ Add-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST'  -filt ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Add-WebConfigurationProperty], COMException
    + FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,Microsoft.IIs.PowerShell.Provider.AddConfigurationPropertyCommand

我可以使用 try catch 块进行抑制，但想检查变量是否已经存在，如果它已经存在则跳过添加。

谁能告诉我如何进行这项检查？

Answer 1

例如，尝试添加以下检查：

$path = "/system.webServer/rewrite/allowedServerVariables"
$value = "HTTP_COOKIE"
if ((Get-WebConfiguration $path).Collection.Name -notcontains $value) {
    Add-WebConfiguration $path -AtIndex 0 -Value @{ name = $value }
}

Answer 2

@marsze 方式已使用 Get-WebConfiguration 完成。

我的答案是使用 Get-WebConfigurationProperty。两者都会起作用。

Write-Host "Getting allowed server variables..."
$allowedServerVariables = Get-WebConfigurationProperty -PSPath "MACHINE/WEBROOT/APPHOST" -filter "system.webServer/rewrite/allowedServerVariables/add" -Name name
Write-Host "Found $($allowedServerVariables.Length)..."

if ( ($allowedServerVariables -eq $null) -or ( $allowedServerVariables | ?{ $_.Value -eq "HTTP_COOKIE1" } ).Length -eq 0 ) {
    #Configure IIS To Allow 'HTTPS' as a server variable - Must be done at a applicationhosts.config level
    Write-Host "Adding HTTPS to allowed server variables..."
    Add-WebConfigurationProperty -pspath "MACHINE/WEBROOT/APPHOST"  -filter "system.webServer/rewrite/allowedServerVariables" -name "." -value @{name='HTTP_COOKIE1'}
}

Write-Host "Getting allowed server variables...Finished"