CheckForDotNet45, patched to make it work on windows server core

gistfile1.cs

using Microsoft.Win32;
using System;
using System.Diagnostics;

// originally from https://github.com/shanselman/SmallestDotNet/tree/master/CheckForDotNet45
// patched to work even on windows server core
namespace CheckForDotNet45
{
	internal class Program
	{
		private const string site = "http://smallestdotnet.com/?realversion={0}";

		public Program()
		{
		}

		private static string Get45or451FromRegistry()
		{
			string str;
			RegistryKey registryKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full\\");
			try
			{
				int value = (int)registryKey.GetValue("Release");
				if (value == 378389)
				{
					str = "4.5";
				}
				else if (!(value == 378758 ? false : value != 378675))
				{
					str = "4.5.1";
				}
				else if (value != 379893)
				{
					str = "4.5";
					return str;
				}
				else
				{
					str = "4.5.2";
				}
			}
			finally
			{
				if (registryKey != null)
				{
					((IDisposable)registryKey).Dispose();
				}
			}
			return str;
		}

		public static bool IsNet45OrNewer()
		{
			return Type.GetType("System.Reflection.ReflectionContext", false) != null;
		}

		private static void Main(string[] args)
		{
			Console.Write("Checking .NET version...");
			if (!Program.IsNet45OrNewer())
			{
				Console.WriteLine(Environment.Version.ToString());
			}
			else
			{
				Console.WriteLine(Program.Get45or451FromRegistry());
			}
		}
	}
}