.net - 无法处理参数 'machine' 的参数转换。无法将值转换为类型 System.String

Question

我是 Powershell 的新手。我基本上只是使用我的 C# 逻辑和 .net 经验以及谷歌来创建这个脚本。我不明白为什么我会收到错误消息:

无法处理参数“机器”上的参数转换。无法将值转换为类型 System.String

function IterateThroughMachineSubkeys{
(
    [Parameter()]
    [string]$machine,
    [Microsoft.Win32.RegistryKey]$subKey
)

    foreach($subKeyName in $subKey.GetSubKeyNames())
    {
        Write-Host -Object ([System.String]::Format("Machine: {0} Module: {1} Version: {2}",
                            $machine.ToString(), $subKeyName.ToString(), 
                            $subKey.OpenSubKey([string]$subKeyName).GetValue("Version", "Not found", [Microsoft.Win32.RegistryValueOptions]::None)))
    }
}

这是我调用函数的地方:

switch -CaseSensitive (ValidateConsoleInput((Read-Host).ToString()))
{
   "E" 
   {
    IterateThroughMachineSubkeys($machine.ToString(), $subKey)
   }
   "C"
   {
    Write-Host -Object "Enter the module name to be queried in the registry:"
    GetSpecificSubkey($machine, $subkey, [string](Read-Host))
   }

}

Answer 1

您的代码有几个问题。

1)函数参数指定不正确；应该是:

function IterateThroughMachineSubkeys([string]$machine, [Microsoft.Win32.RegistryKey]$subKey)
{
  ...
}

2)函数调用不正确；应该是:

IterateThroughMachineSubkeys -machine $machine.ToString() -subKey $subKey

这里是完整的函数:

function IterateThroughMachineSubkeys([string]$machine, [Microsoft.Win32.RegistryKey]$subKey)
{
    foreach($subKeyName in $subKey.GetSubKeyNames())
    {
        Write-Host -Object ([System.String]::Format("Machine: {0} Module: {1} Version: {2}",
                            $machine.ToString(), $subKeyName.ToString(), 
                            $subKey.OpenSubKey([string]$subKeyName).GetValue("Version", "Not found", [Microsoft.Win32.RegistryValueOptions]::None)))
    }
}

$testKey = get-item "HKCU:\Software"
IterateThroughMachineSubkeys -machine . -subKey $testKey

或使用 PowerShell cmdlet:

$key = get-item "hkcu:\Software\Google\Chrome"
$key | get-childitem | foreach-object { 
    write-host "Machine: $machine Module: $($_.PSChildName) Version: " `
    $key.OpenSubKey($_.PSChildName).GetValue("Version", "Not found", [Microsoft.Win32.RegistryValueOptions]::None) 
}