在 PowerShell 中处理 AD 用户 LastLogonDate 和当前日期

Question

我正在尝试根据 LastLogondate 从 AD 获取用户信息，并根据 LastLogonDate 和当前日期计算出用户登录后的天数。

这是脚本

$Result = Get-ADUser -filter {SamAccountName -eq 'username'} -Properties UserPrincipalName, mail, LastLogonDate, Enabled
$CurrentDate = (Get-Date)
Write-Host $Result.LastLogonDate
try
{
$LastLogonDays = ($CurrentDate - $Result.LastLogonDate).Days
Write-Host $LastLogonDays
    $Json = @{
    "UserPrincipalName"= $Result.UserPrincipalName;
    "mail"= $Result.mail;
    "LastLogonDate"= ($Result.LastLogonDate).ToString();
    "days"= $LastLogonDays
    }
    $User = $Json
}
catch{
$Message = $_.Exception.Message
}

$JSONOutput = @{"result"=$User;"error"=$Message} | ConvertTo-Json #-Compress
Write-Output $JSONOutput

我得到了预期的结果，但日志中也捕获了错误，无法弄清楚why/how发生了错误

8/18/2021 4:16:45 AM
61
{
    "error":  "Cannot find an overload for \"op_Subtraction\" and the argument count: \"2\".",
    "result":  {
                   "LastLogonDate":  "8/18/2021 4:16:45 AM",
                   "mail":  "user@user.com",
                   "UserPrincipalName":  "UserPrincipalName",
                   "days":  61
               }
}

Answer 1

解释您收到该错误的原因：

PS > [datetime]::Now - $null
Cannot find an overload for "op_Subtraction" and the argument count: "2".

这意味着，这个用户或这个用户之前的用户在他们的LastLogonDate 属性。请注意，我说的是 users before this one 因为你处理代码的方式，变量 $Message 上的值永远不会被清除，你总是添加它的这里的值：

$JSONOutput = @{"result"=$User;"error"=$Message}

现在，作为替代，这就是我个人处理代码的方式。请注意，在这种情况下我没有使用 try { } catch { } 块，因为我觉得不需要它。

$ErrorActionPreference = 'Stop'
$CurrentDate = [datetime]::Now
$userName = 'john.doe'

# UserPrincipalName and Enabled are not needed. Both are default properties returned by Get-ADUser
$Result = Get-ADUser -LDAFilter "(SamAccountName=$userName)" -Properties mail, LastLogonDate

if(-not $Result)
{
    throw "No user found with sAMAccountName $userName"
}

Write-Host $Result.LastLogonDate

$Json = @{
    UserPrincipalName = $Result.UserPrincipalName
    mail = $Result.mail
}

if($Result.LastLogonDate)
{
    $LastLogonDays = ($CurrentDate - $Result.LastLogonDate).Days
    Write-Host $LastLogonDays
    $Json.LastLogonDate = $Result.LastLogonDate.ToString()
    $Json.Days = $LastLogonDays
}
else
{
    $Json.Error = "Null value on LastLogonDate for User {0}" -f $Result.Name 
}

$Json | ConvertTo-Json

在 PowerShell 中处理 AD 用户 LastLogonDate 和当前日期

Handling AD user LastLogonDate & current date in PowerShell

powershell

active-directory