为什么我的 PowerShell 脚本不遵守步骤顺序？

Question

我试图自己找到解决方案，但现在我没有主意了。我编写了一个脚本，我想用它来检查机器上是否安装了 Erlang：

# Check if a Software ins installed
function Check_Program_Installed($programName) {
$x86_check = ((Get-ChildItem "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall") |
Get-ItemProperty |
        Where-Object {$_.DisplayName -like "*$programName*" } |
            Select-Object -Property DisplayName, UninstallString)

if(Test-Path 'HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall')  
{
$x64_check = ((Get-ChildItem "HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall") |
Get-ItemProperty |
        Where-Object {$_.DisplayName -like "*$programName*" } |
            Select-Object -Property DisplayName, UninstallString)
}
if ($x86_check -and $x64_check -eq $null){ 
    write-host "$programName is not installed on this computer" -ForegroundColor Green 
    #continue
    }
elseif ($x86_check -or $x64_check -ne $null){
    write-host "On this computer is installed " -ForegroundColor Red     
    $x86_check
    $x64_check

    }
}

# Erlang check
Write-Host "Checking if Erlang exist    " -NoNewline
Check_Program_Installed("Erlang")

Write-Host "The End: the script ends here" -ForegroundColor Yellow

但如果我执行它作为结果，最后一行会在 之前执行Check_Program_Installed("Erlang")。为什么 PowerShell 不尊重步骤优先级？

Checking if Erlang exist        On this computer is installed

The End: the script ends here
DisplayName          UninstallString
-----------          ---------------
Erlang OTP 21 (10.2) C:\Program Files\erl10.2\Uninstall.exe

Answer 1

只需将 Format-Table 添加到 $x86_check 和 $64_check 末尾即可。链接来回答。

# Check if a Software ins installed
function Check_Program_Installed($programName) {
$x86_check = ((Get-ChildItem "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall") |
Get-ItemProperty |
        Where-Object {$_.DisplayName -like "*$programName*" } |
            Select-Object -Property DisplayName, UninstallString) | Format-Table

if(Test-Path 'HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall')  
{
$x64_check = ((Get-ChildItem "HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall") |
Get-ItemProperty |
        Where-Object {$_.DisplayName -like "*$programName*" } |
            Select-Object -Property DisplayName, UninstallString) | Format-Table
}
if ($x86_check -and $x64_check -eq $null){ 
    write-host "$programName is not installed on this computer" -ForegroundColor Green 
    #continue
    }
elseif ($x86_check -or $x64_check -ne $null){
    write-host "On this computer is installed " -ForegroundColor Red     
    $x86_check
    $x64_check

    }

}

# Erlang check
Write-Host "Checking if Erlang exist    " -NoNewline
Check_Program_Installed("Erlang")
Write-Host "The End: the script ends here" -ForegroundColor Yellow