PowerShell批量配置用户壁纸遇op_Addition方法错误求助

错误原因 #

报错Method invocation failed because [System.Management.Automation.PSObject] does not contain a method named 'op_Addition'的核心问题是：当系统中只有一个用户配置文件时，Get-ItemProperty返回的是单个PSObject对象而非数组。此时用+=运算符尝试添加.DEFAULT配置文件对象会失败——因为单个PSObject实例没有定义加法操作。

修复方案 #

1. 强制将用户配置文件转为数组 #

在获取用户配置文件的语句外层包裹@(...)，确保$UserProfiles始终是数组类型，哪怕只返回一个对象：

$UserProfiles = @(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\*" | Where {$_.PSChildName -match "S-1-5-21-(\d+-?){4}$" } | Select-Object @{Name="SID"; Expression={$_.PSChildName}}, @{Name="UserHive";Expression="$($_.ProfileImagePath)\NTuser.dat"})

2. 完整修复后的脚本 #

# Get each user profile SID and Path to the profile - 强制转为数组
$UserProfiles = @(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList\*" | Where {$_.PSChildName -match "S-1-5-21-(\d+-?){4}$" } | Select-Object @{Name="SID"; Expression={$_.PSChildName}}, @{Name="UserHive";Expression="$($_.ProfileImagePath)\NTuser.dat"})

# Add in the .DEFAULT User Profile
$DefaultProfile = "" | Select-Object SID, UserHive
$DefaultProfile.SID = ".DEFAULT"
$DefaultProfile.UserHive = "C:\Users\Public\NTuser.dat"
$UserProfiles += $DefaultProfile

# Loop through each profile on the machine
Foreach ($UserProfile in $UserProfiles) {
    # 先检查NTuser.dat文件是否存在
    if (-not (Test-Path $UserProfile.UserHive)) {
        continue
    }

    # Load User ntuser.dat if it's not already loaded
    If (($ProfileWasLoaded = Test-Path Registry::HKEY_USERS\$($UserProfile.SID)) -eq $false) {
        Start-Process -FilePath "CMD.EXE" -ArgumentList "/C REG.EXE LOAD HKU\$($UserProfile.SID) $($UserProfile.UserHive)" -Wait -WindowStyle Hidden
    }

    # Write to the registry
    $key = "Registry::HKEY_USERS\$($UserProfile.SID)\Control Panel\Desktop"
    # 确保注册表路径存在，不存在则创建
    if (-not (Test-Path $key)) {
        New-Item -Path $key -Force | Out-Null
    }
    Set-ItemProperty -Path $key -Name Wallpaper -Value "$WallpaperPath"
    Set-ItemProperty -Path $key -Name TileWallpaper -Value "0" 
    Set-ItemProperty -Path $key -Name WallpaperStyle -Value "$Style" -Force

    # Unload NTuser.dat        
    If ($ProfileWasLoaded -eq $false) {
        [gc]::Collect()
        Start-Sleep 1
        Start-Process -FilePath "CMD.EXE" -ArgumentList "/C REG.EXE UNLOAD HKU\$($UserProfile.SID)" -Wait -WindowStyle Hidden | Out-Null
    }
}

额外优化点 #

• 添加了NTuser.dat文件存在性检查，避免尝试加载不存在的文件
• 增加注册表路径检查，不存在则自动创建，避免Set-ItemProperty报错

内容的提问来源于stack exchange，提问作者Adam Kohne