A powershell script that will exclude files in a project from StyleCop analysis.

ExcludeProjectFromStyleCop.ps1

[CmdletBinding()]
Param(
  [Parameter(Mandatory=$True)]
	[string]$projectPath,
	[string]$filter='*.*',
	[switch]$useRegularExpression=$False,
	[switch]$undo=$False
)

$ErrorActionPreference = "Stop"

if(!(test-path (Resolve-Path $projectPath))){
	throw "Unable to locate project file"
}
else{
	$projectPath = Resolve-Path $projectPath
}

#Load the project file
$xml = New-Object XML
$xml.Load($projectPath)

#Update compiled files to add the <ExcludeFromStyleCop> element
$xml.GetElementsByTagName("Compile") | 
	where { 
		if($useRegularExpression){
			$_.Include -match $filter  
		} else{
			$_.Include -like $filter
		}
	} |% { 
		
		if($undo){
			Write-Host "Undoing exlusion for file '$($_.Include)'" -ForegroundColor 'Gray'
		
			if($_.ExcludeFromStyleCop){
				$parent = $_
				$items = @()
				
				$_.GetElementsByTagName("ExcludeFromStyleCop") |% {
					$items = $items + $_
				}
				
				$items |% {
					$parent.RemoveChild($_) | Out-Null
				}
			}
		} else{
			Write-Host "Ignoring file '$($_.Include)'" -ForegroundColor 'Gray'
			
			if($_.ExcludeFromStyleCop -eq $null){
				$elem = $xml.CreateElement("ExcludeFromStyleCop", $xml.Project.NamespaceURI)
				$elem.InnerText = "True"
				$_.AppendChild($elem) | Out-Null
			} else{
				$_.GetElementsByTagName("ExcludeFromStyleCop") |% {
					$_.InnerText = "True"
				}
			}
		}
	}

#Save File
$xml.Save($projectPath)

if($undo){
	Write-Host "Project file has been updated. Exclusions matching '$filter' have been undone"
} else{
	Write-Host "Project file has been updated to exclude all files matching '$filter' from StyleCop"
}

This script will allow you to exclude files in a project from StyleCop analysis by adding <ExcludeFromStyleCop>True</ExcludeFromStyleCop> for each <Compile> element that it matches.

To exclude all files

ExcludeProjectFromStyleCop.ps1 "c:\dev\awesome.csproj"

To exclude only files that match a filter

ExcludeProjectFromStyleCop.ps1 "c:\dev\awesome.csproj" "Admin*.cs"

To use a regular expression while filtering

ExcludeProjectFromStyleCop.ps1 "c:\dev\awesome.csproj" "Admin[0-9]{3}\.cs" -useRegularExpression

To undo changes

ExcludeProjectFromStyleCop.ps1 "c:\dev\awesome.csproj" -undo