DynamicParams.ps1

function New-TfsWorkItem
{
	[OutputType([void])]
	[CmdletBinding()]
	param
	(
		[Parameter(Mandatory)]
		[ValidateNotNullOrEmpty()]
		[string]$Title,
		
		[Parameter(Mandatory)]
		[ValidateNotNullOrEmpty()]
		[ValidateSet('Adam Bertram','Steve Evans','Paul Shamus')]
		[string]$AssignedTo,
		
		[Parameter()]
		[ValidateNotNullOrEmpty()]
		[ValidateSet(1,2,3,4,5)]
		[int]$Priority = 2,
		
		[Parameter()]
		[ValidateNotNullOrEmpty()]
		[string]$ProjectName = 'IS-DevOps',
		
		[Parameter()]
		[ValidateNotNullOrEmpty()]
		[Microsoft.TeamFoundation.Client.TfsTeamProjectCollection]$ProjectCollection = (Get-TfsProjectCollection -Uri 'http://tfs:8080/tfs')
	)
	DynamicParam
	{
		
		$RuntimeParamDic = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary
		
		$workItemStore = $ProjectCollection.GetService([Microsoft.TeamFoundation.WorkItemTracking.Client.workitemstore])
		$project = $workItemStore.Projects[$ProjectName]

		$dynParams = @(
			@{
				'Name' = 'IterationPath'
				'Mandatory' = $true
				'ValidateSetOptions' = $project.IterationRootNodes.foreach({ $_.Path; if ($_.HasChildNodes) { $_.ChildNodes.Path } })
			},
			@{
				'Name' = 'Type'
				'Mandatory' = $true
				'ValidateSetOptions' = $project.WorkItemTypes.Name
			},
			@{
				'Name' = 'AreaPath'
				'Mandatory' = $true
				'ValidateSetOptions' = $project.AreaRootNodes.foreach({ $_.Path; if ($_.HasChildNodes) { $_.ChildNodes.Path } })
			}
		)
		
		@($dynParams).foreach({
			$RuntimeParam = New-DynamicParameter @_
			$RuntimeParamDic.Add($_.Name, $RuntimeParam)
		})
		
		$RuntimeParamDic
	}
	begin {
		Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState
		Write-Log -Source $MyInvocation.MyCommand -Message "$($MyInvocation.MyCommand) : Entering"
		$ErrorActionPreference = 'Stop'
		$PsBoundParameters.GetEnumerator() | foreach { New-Variable -Name $_.Key -Value $_.Value -ea 'SilentlyContinue' }
	}
	process {
		try
		{
			$workItemType = $project.WorkItemTypes[$PSBoundParameters.Type]

			$workItem = New-Object -TypeName 'Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItem' -ArgumentList $workItemType
			$workItem['Priority'] = $Priority
			$workItem['Assigned To'] = $AssignedTo
			$workItem['Area Path'] = $AreaPath
			$workItem['Iteration Path'] = $IterationPath
			$workItem['Title'] = $Title
			
			$workItem.Save()
		}
		catch
		{
			Write-Log -Source $MyInvocation.MyCommand -EventId 1003 -EntryType 'Error' -Message ($_ | Resolve-Error)
		}
	}
	end {
		Write-Log -Source $MyInvocation.MyCommand -Message ('{0}: Exiting' -f $MyInvocation.MyCommand)
		$ErrorActionPreference = 'Continue'
	}
}

function New-DynamicParameter
{
	[CmdletBinding()]
	[OutputType('System.Management.Automation.RuntimeDefinedParameter')]
	param (
		[Parameter(Mandatory)]
		[ValidateNotNullOrEmpty()]
		[string]$Name,
		
		[ValidateNotNullOrEmpty()]
		[Parameter()]
		[array]$ValidateSetOptions,
		
		[Parameter()]
		[switch]$Mandatory = $false,
		
		[Parameter()]
		[string]$ParameterSetName = '__AllParameterSets',
		
		[Parameter()]
		[switch]$ValueFromPipeline = $false,
		
		[Parameter()]
		[switch]$ValueFromPipelineByPropertyName = $false
	)
	
	$AttribColl = New-Object System.Collections.ObjectModel.Collection[System.Attribute]
	$ParamAttrib = New-Object System.Management.Automation.ParameterAttribute
	$ParamAttrib.Mandatory = $Mandatory.IsPresent
	$ParamAttrib.ParameterSetName = $ParameterSetName
	$ParamAttrib.ValueFromPipeline = $ValueFromPipeline.IsPresent
	$ParamAttrib.ValueFromPipelineByPropertyName = $ValueFromPipelineByPropertyName.IsPresent
	$AttribColl.Add($ParamAttrib)
	if ($PSBoundParameters.ContainsKey('ValidateSetOptions'))
	{
		$AttribColl.Add((New-Object System.Management.Automation.ValidateSetAttribute($ValidateSetOptions)))
	}
	$RuntimeParam = New-Object System.Management.Automation.RuntimeDefinedParameter($Name, [string], $AttribColl)
	$RuntimeParam
	
}
#endregion function New-TfsWorkItem