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我正在尝试使用 PowerShell 和 Windows Search 来获取我的磁盘使用情况的一些统计信息。这就是我现在想出的：

$sql        = "SELECT System.FileExtension, System.Size FROM SYSTEMINDEX WHERE DIRECTORY = 'C:\Users\...\Documents' AND System.FileExtension = '.docx'"
$provider   = "provider=search.collatordso;extended properties=’application=windows’;" 
$connector  = New-Object System.Data.OleDb.OleDbDataAdapter -Argument $sql, $provider 
$dataset    = New-Object System.Data.DataSet

if ($connector.fill($dataset)) {
    $res = $dataset.Tables[0]

    $res | Group-Object System.FileExtension |
        Select-Object System.FileExtension,
            @{Name='Total';Expression={($_.Group | Measure-Object SYSTEM.Size -Sum).Sum}} |
        Format-Table
}

这行得通，但它看起来有点难看。我也发现并尝试了这个：

$sql       = "SELECT System.Size FROM SYSTEMINDEX WHERE DIRECTORY = 'C:\Users\...\Documents' AND System.FileExtension = '.docx'"
$provider  = "provider=search.collatordso;extended properties=’application=windows’;" 
$connector = New-Object System.Data.OleDb.OleDbDataAdapter -Argument $sql, $provider 
$dataset   = New-Object System.Data.DataSet

if ($connector.fill($dataset)) {
    $dataset.Tables[0].Compute("Sum(SYSTEM.Size)")
}

看起来好多了，但会引发错误：

找不到“计算”的重载和参数计数：“1”

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