Monday, 23 May 2011

Turn on "Warnings as Errors" for all projects in a solution

It's a habit of mine to always try to address any compiler warnings, as more often than not a warning is an indication that something is wrong with your code (even though it is still may be compilable). One way to ensure this is to make warnings cause a build to fail (just like errors do).

For a single project, you can turn this on within the Build tab of the Project Properties page:

Treat warnings as errors in Project Properties

If you have a large solution with lots of existing projects, this can be a bit tedious so I wrote a PowerShell script to automate the process. It finds all C# projects, and for each .csprof file updates every configuration block found and adds a new <TreatWarningsAsErrors> element. (If you don't use TFS then just comment out the line that calls TF.EXE)


Get-ChildItem -Recurse -Filter "*.*csproj" | % {
    Write-Host $_.Name
    $filename = $_.Fullname
    $proj = [xml]( Get-Content $_.Fullname )

    $xmlNameSpace = new-object System.Xml.XmlNamespaceManager($proj.NameTable)

    $xmlNameSpace.AddNamespace("p", "")
    $nodes = $proj.SelectNodes("/p:Project/p:PropertyGroup[@Condition and not (p:TreatWarningsAsErrors)]", $xmlNameSpace)
    $touched = $false
    $nodes | ForEach-Object -Process { 
        $e = $proj.CreateElement("TreatWarningsAsErrors", "")
        $_.AppendChild($e) | Out-Null
        $touched = $true
    if ($touched) {
        Write-Host "Checkout $filename"
        & "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\TF.exe" checkout $filename | Out-Null
        $proj.Save("$($filename)") | Out-Null


Anonymous said...

Thanks Dave - exactly what I was looking for! My client has a 120+ project solution (a whole other problem) in a nested folder structure and this worked a treat!

Kerem said...