C#でOSのバージョンやフレームワークの情報を取得する【Mono|.NET Framework】

using System;
using System.Reflection;
using System.Runtime.InteropServices;
/*
コンパイル
mcs OSVer.cs -out:OSVer.exe
*/
class Prog
{
    static void Main()
    {
        var os = System.Environment.OSVersion;
        Console.WriteLine("Version:{0}", os.VersionString);
        Console.WriteLine("MajorVer:{0}", os.Version.Major);
        Console.WriteLine("PlatformID:{0}", os.Platform);
        Console.WriteLine("ServicePack:{0}", os.ServicePack);

        Console.WriteLine("Framework:{0}", RuntimeInformation.FrameworkDescription);
        Console.WriteLine("OSArchitecture:{0}", RuntimeInformation.OSArchitecture);
        Console.WriteLine("OSDescription:{0}", RuntimeInformation.OSDescription);
        Console.WriteLine("ProcessArchitecture:{0}", RuntimeInformation.ProcessArchitecture);
    }
}//class