Expand-WinEvent.ps1


function Expand-WinEvent {
    <#
    .SYNOPSIS
    Configured EventLogRecords into EventLogExpandedRecords that are easier to parse

    .DESCRIPTION
    Convert eventRecords into a more parseable object format, including custom event properties
    By expanding the Event XML data into individual properties, this makes WinEvents easier to work with and parse

    .NOTES
    Inspired by http://blogs.technet.com/b/ashleymcglone/archive/2013/08/28/powershell-get-winevent-xml-madness-getting-details-from-event-logs.aspx

    .EXAMPLE
    PS C:\> Get-Winevent -LogName Application | Expand-WinEvent

    Takes all application logs and expands their properties.

    #>

    param (
        #Specifies an event generated by Get-WinEvent. WARNING: DOES NOT WORK WITH GET-EVENTLOG
        [Parameter(Mandatory,ValueFromPipeline)]
        [System.Diagnostics.Eventing.Reader.EventLogRecord]$EventLogRecord,
        #If specified, outputs a hashtable of object properties rather than the object itself. Useful for creating a subtype.
        [Switch]$OutHashTable
    )

    begin {
        #Define the event type and default display properties
        $CustomEventRecordType = "System.Diagnostics.Eventing.Reader.EventLogRecordExpanded"
        Update-TypeData -TypeName $CustomEventRecordType -DefaultDisplayPropertySet TimeCreated,ID,ProviderName,TaskDisplayName -Force
    } #Begin

    process {
        $EventLogRecord | foreach {

            $EventProperties = [ordered]@{
                TimeCreated = $PSItem.TimeCreated
                ID = $PSItem.ID
                LevelDisplayName = $PSItem.LevelDisplayName
                ProviderName = $PSItem.ProviderName
                TaskDisplayName = if ($PSItem.TaskDisplayName) {$PSItem.TaskDisplayName} else {$null}
                MachineName = $PSItem.MachineName
                Message = $PSItem.Message
                RawEvent = $PSItem
            }


            #Add all the attribute properties of the event object. This is dynamic and works for all events.
            $i = 1
            ([xml]$PSItem.toxml()).Event.EventData.Data |  foreach {
                #Skip in the event this is a classic log with no attribute properties
                if ($PSItem) {

                    #If the data is unstructured, just create as "Property1","Property2", etc.
                    if ($PSItem -isnot [System.XML.XMLElement]){
                        $PropertyName = "Property" + $i
                        $EventProperties.Add($PropertyName,$PSItem)
                        $i++
                    }

                    else {
                        if ($EventProperties.Contains($PSItem.Name)) {
                            $PropertyName = "property" + $PSItem.Name
                        } else { $PropertyName = $PSItem.Name }
                        $EventProperties.Add($PropertyName,$PSItem."#text")
                    }
                } #If ($PSItem)
            } #ForEach

            if ($OutHashTable) {
                $EventProperties
            }
            else {
                $result = [PSCustomObject]$EventProperties
                #Assign custom type so it shows properly in Get-Member
                $result.PSTypeNames.Insert(0,$customEventRecordType)
                $result
            }
        } #ForEach
    } #Process
} #Expand-WinEvent