using System;

using System.Globalization;

using System.Linq;

using NuGet.Versioning;

​

public class Program

{

        private static string GetRuntimeVersion(NuGetVersion version)

        {

            if (version.IsPrerelease)

            {

                var buildNumberString = version.ReleaseLabels.Last();

                if (uint.TryParse(buildNumberString, out _))

                {

                    var normalizedVersion = version.ToNormalizedString();

                    // HACK: Remove the build number from pre-release versions, such as "6.0.0-test.21315".

                    // May cause unexpected behaviour if build number is no longer included in the future.

                    return normalizedVersion.Substring(0, normalizedVersion.LastIndexOf('.'));

                }

​

                return version.ToNormalizedString();

            }

​

            return string.Format(CultureInfo.InvariantCulture, "{0}.{1}", version.Major, version.Minor);

        }

    public static void Main()

    {       

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("1.0.0")));

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("1.2.3")));

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("2.3.4-test")));

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("3.0.0-test.12345")));

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("3.0.0-unix-timestamp.1652942155")));

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("3.0.0-test.12345.qwe")));

        Console.WriteLine(GetRuntimeVersion(new NuGetVersion("3.0.0-test.12345.asd.456")));

    }

}