Powershell script for generating a version number and inserting it into the csproj

SetCsProjVersion.ps1

param(
    [Parameter(Mandatory = $true)]
    [string] $csprojPath,

    [Parameter(Mandatory = $true)]
    [string] $newVersion
)

Write-Host "Starting process of generating new version number for the csproj"

foreach ($filePath in (Get-ChildItem -Path $csprojPath -Recurse)) {

    Write-Host "Setting version of $filePath..."

    $splitNumber = $newVersion.Split(".")
    if ( $splitNumber.Count -eq 4 ) {
        $majorNumber = $splitNumber[0]
        $minorNumber = $splitNumber[1]
        $revisionNumber = $splitNumber[3]
	
        # I need to keep my build number under the 65K int limit, hence this hack of a method
        $myBuildNumber = (Get-Date).Year + ((Get-Date).Month * 31) + (Get-Date).Day
        $myBuildNumber = $majorNumber + "." + $minorNumber + "." + $myBuildNumber + "." + $revisionNumber
 
        $xml = New-Object XML
        $xml.Load($filePath)
        $xml.Project.PropertyGroup.Version = $myBuildNumber
        $xml.Save($filePath)

        Write-Host "Updated csproj "$csprojPath" and set to version "$myBuildNumber
    }
    else {
        Write-Host "ERROR: Something was wrong with the build number"
    }
}

Added params and support for multiple projects to update.