我試圖輸出 $message 以防檔案夾中的一個檔案或多個檔案與今天或昨天的日期匹配。在這種情況下，如果檔案匹配日期，它應該為每個檔案輸出一條訊息，例如，“檔案 $filename 匹配”，其中 $filename 是匹配日期的檔案的名稱。
另一方面，如果檔案與當前日期或昨天的日期不匹配，它也會回傳一條訊息，但只會回傳一條檔案名與日期不匹配的訊息。
以下代碼不會發生這種情況：
$in = $false
foreach ($file in Get-ChildItem -Path $Directory) {
$today = $file.LastWriteTime.Date -eq [datetime]::Today
$yesterday = $file.LastWriteTime.Date -eq [datetime]::Today.AddDays(-1)
if ($today -or $yesterday) {
$message = "file exists"
$in = $true
Write-Output $message
}
}
if ($in -eq $false) {
$message_error = "file does not exist"
Write-Output $message_error
}
相反，當檔案匹配日期（昨天或今天的日期）時，它會多次輸出訊息，如果像上面那樣縮進，則輸出超過 20 倍。
至于如果不匹配，則只輸出 1x，但應該是 2x，因為有 2 個檔案與日期不匹配。
誰能給我一個提示？
輸出應該看起來像
如果檔案夾中的一個或多個檔案與日期匹配：
"File example.txt matches date
and
File example2.txt matches date"
否則，如果檔案夾中的檔案與日期不匹配：
"File example.txt, example2.txt don't match dates"
編輯
相反，我正在嘗試這樣：
$in = $false
foreach ($file in Get-ChildItem -Path $Directory) {
$today = $file.LastWriteTime.Date -eq [datetime]::Today
$yesterday = $file.LastWriteTime.Date -eq [datetime]::Today.AddDays(-1)
if ($today -or $yesterday) {
$msg_found = "file" $file "exists"
$in = $true
} else {
$msg_notfound = "File" $file "Not found"
}
Write-Output $msg_notfound
Write-Output $msg_found
在這里，訊息以正確的數量輸出，但它們在任何情況下都會出現。如果我使用 if 回圈會解決嗎？
uj5u.com熱心網友回復：
只需收集與變數中的參考日期不匹配的日期，并將匹配的檔案直接寫入控制臺：
# set the reference date to midnight using .Date
$refDate = [datetime]::Today.AddDays(-1).Date
# loop through the files in the directory and test their LastWriteTime dates
$notMatch = foreach ($file in (Get-ChildItem -Path $Directory -File)) {
if ($file.LastWriteTime -ge $refDate) {
# use Write-Host so this message doesn't end up in variable $notMatch
Write-Host "File '$($file.Name)' matches the date"
}
else {
# output the filename so it gets collected in variable $notMatch
$file.Name
}
}
# now output the list of files that didn't match to the console
if (@($notMatch).Count) {
$message = "Files that don't match the date:`r`n{0}" -f ($notMatch -join [environment]::NewLine)
Write-Host $message -ForegroundColor Red
}
else {
Write-Host "All files matched the date!" -ForegroundColor Green
}
既然你問了，這里有兩個替代代碼給你
1：捕獲陣列變數中的所有內容，稍后拆分
# set the reference date to midnight using .Date
$refDate = [datetime]::Today.AddDays(-1).Date
# loop through the files in the directory and test their LastWriteTime dates
$result = foreach ($file in (Get-ChildItem -Path $Directory -File)) {
[PsCustomObject]@{
File = $file.Name
MatchesDate = ($file.LastWriteTime -ge $refDate) # --> either $true or $false
}
}
# you now have a list of every file name found in the directory, together with a boolean
# value teling you if the LastWriteTime matched the $refDate or not.
# split out for console output
$matchedFiles = ($result | Where-Object { $_.MatchesDate }).File -join [environment]::NewLine
Write-Host "Files that were last modified yesterday or today:`r`n{0}" -f $matchedFiles -ForegroundColor Green
$notMatch = ($result | Where-Object {-not $_.MatchesDate }).File -join [environment]::NewLine
Write-Host "Files that were last modified before yesterday:`r`n{0}" -f $notMatch -ForegroundColor Red
2：在兩個單獨的串列中捕獲所有內容
# set the reference date to midnight using .Date
$refDate = [datetime]::Today.AddDays(-1).Date
# create two lists
$matchedFiles = [System.Collections.Generic.List[string]]::new()
$notMatch = [System.Collections.Generic.List[string]]::new()
# loop through the files in the directory and test their LastWriteTime dates
# we're not outputting anything inside the list, but add to the appropriate list instead
foreach ($file in (Get-ChildItem -Path $Directory -File)) {
if ($file.LastWriteTime -ge $refDate) {
$matchedFiles.Add($file.Name)
}
else {
$notMatch.Add($file.Name)
}
}
# you now have separate lists of every iles that matched and files that did not match the date criterium
# console output
Write-Host "Files that were last modified yesterday or today:`r`n{0}" -f ($matchedFiles -join [environment]::NewLine) -ForegroundColor Green
Write-Host "Files that were last modified before yesterday:`r`n{0}" -f ($notMatch -join [environment]::NewLine) -ForegroundColor Red
uj5u.com熱心網友回復：
繼續我的評論......如果你想輸出大于或等于昨天日期的檔案名，有幾種方法可以解決這個問題：
Get-ChildItem -Path $Directory |
ForEach-Object -Begin {
$notMatch = [System.Collections.ArrayList]::new()
$date = [datetime]::Today.AddDays(-1)
} -Process {
if ($_.LastWriteTime -ge $date) {
Write-Host -Object "File: [$($_.Name)] - Matches Date"
}
else {
$null = $notMatch.Add($_.Name)
}
} -End {
($notMatch -join ', ' ) "don't match dates."
}
幸運的是，匹配出現的日期對于匹配的檔案是一個簡單的解決方案。至于那些不是，您可以創建一個陣列來保存名稱的值，直到回圈結束以顯示由 ( ", " )連接的值。
uj5u.com熱心網友回復：
嘗試這個：
foreach ($file in Get-ChildItem -Path $Directory) {
$today = $file.LastWriteTime.Date -eq [datetime]::Today
$yesterday = $file.LastWriteTime.Date -eq [datetime]::Today.AddDays(-1)
# If file was written to today or yesterday, write $msg_found
if ($today -or $yesterday) {
$msg_found = "File " $file " exists"
Write-Output $msg_found
}
# If not, write $msg_notfound
else {
$msg_notfound = "File " $file " not found"
Write-Output $msg_notfound
}
}
如果我理解正確的話，它同時撰寫 the$msg_found和$msg_notfoundvariables 的原因是因為您將它們放在If/Else陳述句之外。
將它們保存在If/Else 中將使它只在If或Else 中寫入 $msg 。
編輯：上面，我洗掉了$in變數，但我不確定您是否需要它。因此，我修改了您在編輯之前發布的腳本，以執行與我最初放置的腳本相同的操作，以防萬一。
我留下評論告訴你我做了什么改變，但如果你有任何問題，請告訴我：
$in = $false
foreach ($file in Get-ChildItem -Path $Directory) {
$today = $file.LastWriteTime.Date -eq [datetime]::Today
$yesterday = $file.LastWriteTime.Date -eq [datetime]::Today.AddDays(-1)
# If file was made today or yesterday, $in is true, write $message
if ($today -or $yesterday) {
$message = "$File exists"
$in = $true
Write-Output $message
}
# If not, $in is false for this file in the ForEach loop
else{
$in = $false
}
# Moved the second If statement into the ForEach loop
# If the If/Else set $in as false for this file, write $message_error
if ($in -eq $false) {
$message_error = "$File does not exist"
Write-Output $message_error
}
}
uj5u.com熱心網友回復：
使用.Where()與Split模式相結合的方法來替代已經提出的答案：
$directory = '.'
$targetDate = [datetime]::Today.AddDays(-1)
$Match, $noMatch = (Get-ChildItem -Path $directory -File).Where({
$_.LastWriteTime -ge $targetDate
}, 'Split')
if($Match)
{
'=' * 60
[string]::Format(
'{0} file{1} found with Date greater than or equal to {2}',
$Match.Count,
($null, 's')[[int]$Match.Count -gt 1],
$targetDate.ToShortDateString()
)
'=' * 60
''
$Match.ForEach({
'- File: {0} with LastWriteTime {1}' -f $_.Name, $_.LastWriteTime
})
}
else
{
'=' * 60
[string]::Format(
'No files found with Date greater than or equal to {0}',
$targetDate.ToShortDateString()
)
'=' * 60
$noMatch | Format-Wide Name -AutoSize
}
uj5u.com熱心網友回復：
$Directory="T:\temp2"
$in = $false
$message=""
foreach ($file in Get-ChildItem -Path $Directory) {
$today = $file.LastWriteTime.Date -eq [datetime]::Today
$yesterday = $file.LastWriteTime.Date -eq [datetime]::Today.AddDays(-1)
if ($today -or $yesterday) {
$in = $true
Write-Output ("File " $file.Name " matches date")
} else {
$message =(" " $file.Name ",")
}
}
if ($in -eq $false) {
$message_error= ("File" $message.Substring(0,$message.Length-1) " don't matches date")
Write-Output $message_error
}
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