Setting Build Version Using AppVeyor and ASP.Net Core

AppVeyor has support for setting the version of a binary during a build. However - this deals with the classic ASP.Net world of AssemblyInfo. I didn't find any reference to support for doing the same with dot net core. Remember, dot net core relies upon a <Version> or a <VersionPrefix> setting in the .csproj file. Personally, <Version> is my jam.

However, coming up with your own bit of powershell that stamps the version during the build is a doddle; here we go:

Param($projectFile, $buildNum)

$content = [IO.File]::ReadAllText($projectFile)

$regex = new-object System.Text.RegularExpressions.Regex ('()([\d]+.[\d]+.[\d]+)(.[\d]+)(<\/Version>)', 
         [System.Text.RegularExpressions.RegexOptions]::MultiLine)

$version = $null
$match = $regex.Match($content)
if($match.Success) {
    # from "1.0.0.0" this will extract "1.0.0"
    $version = $match.groups[2].value
}

# suffix build number onto $version. eg "1.0.0.15"
$version = "$version.$buildNum"

# update "1.0.0.0" to "$version"
$content = $regex.Replace($content, '${1}' + $version + '${4}')

# update csproj file
[IO.File]::WriteAllText($projectFile, $content)

# update AppVeyor build
Update-AppveyorBuild -Version $version

You can invoke this script as part of the build process in AppVeyor by adding something like this to your appveyor.yml.

before_build:
- ps: .\ModifyVersion.ps1 $env:APPVEYOR_BUILD_FOLDER\src\Proverb.Web\Proverb.Web.csproj $env:APPVEYOR_BUILD_NUMBER

It will keep the first 3 parts of the version in your .csproj (eg "1.0.0") and suffix on the build number supplied by AppVeyor.