检查文件是否被占用

function Test-FileLocked([string]$FilePath) {
    try { [IO.File]::OpenWrite($FilePath).close(); return $false }
    catch { return $true }
}
function Test-AnyFileLocked([string]$DirPath) {
    $files = Get-ChildItem $DirPath -Recurse
    foreach ($file in $files) {
        if (Test-FileLocked (Convert-Path $file.PSPath)) {
            return $true
        }
    }
    return $false
}
if (Test-FileLocked $filePath){
    Write-Warning "File in use."
}
if (Test-AnyFileLocked $dirPath){
    Write-Warning "Some files in use."
}