监视文件是否有变化，但仅对内容进行了更改（而不是上次修改日期）？

Question

我修改了一个监视文件夹的小脚本，并在该文件夹发生更改时发出警报。以下是我到目前为止的情况：

$folder = 'folder\to\monitor' 

$fsw = New-Object IO.FileSystemWatcher $folder, $filter -Property @{IncludeSubdirectories = $true;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'}

Register-ObjectEvent $fsw Changed -SourceIdentifier FileChanged1 -Action { 
$path = $Event.SourceEventArgs.FullPath 
$changeType = $Event.SourceEventArgs.ChangeType 
$timeStamp = $Event.TimeGenerated 
$datestamp = get-date -uformat "%Y-%m-%d@%H-%M-%S" 
$Computer = get-content env:computername 
$Body = " $path on $Computer was $changeType at $timeStamp" 
$PIECES=$path.split("\") 
$newfolder=$PIECES[-2] 
Out-File -FilePath c:\Scripts\config_changes.txt -Append -InputObject " $path on $Computer was $changeType at $timeStamp" 
Send-MailMessage -To "email@domain.com" -From "email@domain.com" -Subject $Body -SmtpServer "192.168.#.##" -Body " " 
#Copy-Item $path "c:\scripts\versions\$newfolder" 
#Rename-Item "c:\Scripts\Versions\$newfolder\web.config" "web.config-$datestamp" 
#Remove-Item -path "c:\Scripts\Versions\$newfolder\web.config" -force}

# To stop the monitoring, run the following commands: 
# Unregister-Event FileChanged1

但是，我想制定＆＃34;标准＆＃34;对于文件更改更具体一点。根据我所做的研究，FileSystemWatcher.Notify过滤器将我限制为文件名，上次写入等。我想要做的是检查是否对内容进行了任何更改的文件。如果没有任何内容发生变化，那么我就不希望它发出警报。

即使没有更改，文件也会不断被覆盖，因此即使没有内容更改，修改日期也会继续更改。