Groovy script for Jenkins that returns the assembly version from a .NET project (SolutionInfo.cs file) and the build time as YYY-MM-DD HH:SS. Can be used to inject variables into the Jenkins build.

jenkins_get_assembly_version.groovy

import hudson.*
import hudson.model.*
import hudson.remoting.*
import hudson.FilePath;
import hudson.FilePath.FileCallable;
import jenkins.*
import jenkins.model.*
import org.jenkinsci.remoting.*;


def isDebugMode = true
  def currentBuild

if(isDebugMode)
{
  // for testing, use last build or specific build number
  currentBuild = Jenkins.instance.getJob("My_project_name").getLastSuccessfulBuild()
}
else
{
  // work with current build
  currentBuild = Thread.currentThread()?.executable
}
if(currentBuild == null)
{
  throw new Exception('Current build is null!')
  return
}

if(currentBuild != null && currentBuild.workspace == null)
{
  throw new Exception('Current build workspace is null!')
  return
}

println currentBuild.workspace

class FileParser
{
  static class FileSearch extends MasterToSlaveFileCallable<String> {
    @Override
    public String invoke(File f, VirtualChannel channel) throws IOException, InterruptedException {
      def line
      def tokens
      def ver
      
      // f and file represent the same thing
      f.withReader { reader ->
        while ((line = reader.readLine())!=null) {
            if(line.contains('AssemblyVersion'))
            {
              tokens = line.tokenize('"')
              ver = tokens[1]
              break;
            }
        }
      }
        
      return ver
    }
  }
}

def searchKey = 'AssemblyVersion'
def version
FilePath file
if(currentBuild.workspace.isRemote())
{
    channel = currentBuild.workspace.channel;
    file = new FilePath(channel, currentBuild.workspace.toString() + "/Src/SolutionInfo.cs")
} else {
    file = new FilePath(new File(currentBuild.workspace.toString() + "/Src/SolutionInfo.cs"))
}
version = file.act(new FileParser.FileSearch())

def map = [:]
map["BUILD_TIMESTAMP"] = currentBuild.getTime().format("YYYY-MMM-DD HH:MM:SS")
map["PRJ_VERSION"] = version
           
println(map)

return map