读取用户输入并传递给 Get-EventLog 函数

Question

请为此提出前进的方向，同样我必须为结束日期、用户名等做。样本：

$StartDate, $String = "", ""

$StartDate = Read-Host -Prompt 'Enter the start date of the logs, Ex: 17/07/2017 09:00:00 '

if ($StartDate -and ( $StartDate -ne " ") -and ($StartDate -ne "")) {
    $StartDate = $StartDate -replace "`t|`n|`r", ""
    $String += " -After '$StartDate'"
} else {
    'You did not enter a valid Start date!'
}
echo "Get-EventLog -LogName Application $String"

Get-EventLog -LogName Application $String

输出：

Get-EventLog -LogName Application  -After '19/07/2017'
Get-EventLog : Cannot bind parameter 'InstanceId'. Cannot convert value
" -After '19/07/2017'" to type "System.Int64". Error: "Input string was not
in a correct format."
At C:\Users\kumars2\Downloads\Santosh\Powershell scripts\Enhancements\View logs examples\small_test.ps1:17 char:13
+ Get-EventLog <<<<  -LogName Application $String
    + CategoryInfo          : InvalidArgument: (:) [Get-EventLog], ParameterBindingException
    + FullyQualifiedErrorId : CannotConvertArgumentNoMessage,Microsoft.PowerShell.Commands.GetEventLogCommand

Answer 1

我不是 100% 确定你在做什么，一些代码在那里跳来跳去，但假设日期有效，这没有问题：

$After = read-host
Get-EventLog -LogName Application -After $After

您可以像这样验证您的输入：

$After = read-host
if ($After -as [DateTime]) {
Get-EventLog -LogName Application -After $After
} else {
    Write-Host "Your input is not a valid date"
}

Answer 2

如果您想为 cmdlet 构建参数列表，您应该使用 splatting 而不是构建（部分）字符串命令行。您收到观察到的错误，因为 PowerShell 将整个字符串 " -After '$StartDate'" 作为参数传递给参数 -InstanceId。此外，您的日期字符串的格式为 dd/MM/yyyy。 PowerShell 无法自动将此字符串转换为 DateTime 值，因此您需要自己完成此操作。

$culture = [Globalization.CultureInfo]::InvariantCulture
$pattern = 'dd\/MM\/yyyy'

$StartDate = $StartDate -replace '\s'  # remove all whitespace from date string
$EndDate   = $EndDate -replace '\s'    # remove all whitespace from date string

$params = @{
    'LogName' = 'Application'
}

if ($StartDate) {
    $params['After'] = [DateTime]::ParseExact($StartDate, $pattern, $culture)
}
if ($EndDate) {
    $params['Before'] = [DateTime]::ParseExact($EndDate, $pattern, $culture)
}

Get-EventLog @params

读取用户输入并传递给 Get-EventLog 函数

read userinput and pass to Get-EventLog function

powershell

get-eventlog