如何修改PowerShell的GpuPreference函数解决参数类型转换错误

Got it, let's resolve this issue with your function. The error occurs because after processing your input, $app becomes a string array, but the -Name parameter of New-ItemProperty only accepts a single string value—it can't handle arrays directly. We need to loop through each path in the array to create registry properties one by one.

Modified Function Code #

function GpuPreference {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true)]
        [string[]]$app
    )

    # Clean input: remove quotes, split by commas, trim whitespace, filter out empty entries
    $cleanedApps = $app.Replace("`"", "").Split(",").Trim() | Where-Object { $_ -ne "" }

    # Loop through each cleaned path to create the registry property
    foreach ($appPath in $cleanedApps) {
        New-ItemProperty -Path HKCU:\Software\Microsoft\DirectX\UserGpuPreferences `
            -Name $appPath `
            -PropertyType String `
            -Value "GpuPreference=2;" `
            -Force
    }
}

Key Changes Explained #

• Added a foreach loop: This iterates over every cleaned application path, ensuring we call New-ItemProperty once per path (fixes the array-to-string conversion error).
• Filtered empty entries: The Where-Object check removes any empty strings that might come from extra commas or whitespace in your input.
• Improved readability: Formatted the code with line breaks and indentation to make it easier to debug and modify later.

Usage Example #

You can now call the function with your quoted, comma-separated paths as intended:

GpuPreference -app '"D:\", "D:\1", "D:\2"'

This will create separate registry properties for D:\, D:\1, and D:\2, each set to GpuPreference=2;.

内容的提问来源于stack exchange，提问作者Sanctuary