Get-MongoEventLog.ps1

function Get-MongoEventLog (
	[Parameter(Position=0)][string] $Regex = '.*',
	[Parameter(Position=1)][string] $Log = $null
)
{
	# Check to see if we are running the 64 bit version of Powershell. 
	# See http://stackoverflow.com/questions/2897569/visual-studio-deployment-project-error-when-writing-to-registry
	if ([intptr]::size -eq 8) { $mongoDriverPath = (Get-ItemProperty "HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v3.5\AssemblyFoldersEx\MongoDB CSharpDriver 1.2").'(default)'; }
	else { $mongoDriverPath = (Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\.NETFramework\v3.5\AssemblyFoldersEx\MongoDB CSharpDriver 1.2").'(default)'; }

	Add-Type -Path "$($mongoDriverPath)\MongoDB.Bson.dll";
	Add-Type -Path "$($mongoDriverPath)\MongoDB.Driver.dll";

	$db = [MongoDB.Driver.MongoDatabase]::Create('mongodb://localhost/powershell');
	[MongoDB.Driver.MongoCollection] $collection = $db['eventlogs']

	[MongoDB.Driver.QueryDocument] $query = [MongoDB.Driver.QueryDocument]@{ 'Source' = @{ '$regex' = $Regex; '$options' = 'i' } }
	if (-not [String]::IsNullOrEmpty($Log)) { $query['Log'] = $Log }


	$collection.Find($query).SetLimit(10) | ForEach-Object {
		$obj = @{};
		$ht = $_.Elements
		$ht | ForEach-Object { $obj[$_.Name] = $_.Value; }
		New-Object PSObject -Property $obj
	} | Select-Object HostName, Log, Source, InstanceId, Index, Message
	#} | Select-Object HostName, Log, Source, InstanceId, Message
}
# Example
Get-MongoEventLog 'service' | Out-GridView