FrameworkVersion.cs

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using Microsoft.Win32;
using ReLogic.OS;
using System;
using System.Reflection;
 
namespace Terraria.ModLoader
{
    public enum Framework
    {
        NetFramework,
        Mono,
        Unknown
    }
 
    public static class FrameworkVersion
    {
        public static readonly Framework Framework;
        public static readonly Version Version;
 
        static FrameworkVersion() {
            var monoRuntimeType = Type.GetType("Mono.Runtime");
            if (monoRuntimeType != null) {
                string displayName = (string)monoRuntimeType.GetMethod("GetDisplayName", BindingFlags.NonPublic | BindingFlags.Static).Invoke(null, null);
                Framework = Framework.Mono;
                Version = new Version(displayName.Substring(0, displayName.IndexOf(' ')));
                return;
            }
 
            if (!Platform.IsWindows)
                Framework = Framework.Unknown;
 
            Framework = Framework.NetFramework;
 
            const string subkey = @"SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\";
            using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey))
                if (ndpKey != null && ndpKey.GetValue("Release") is int releaseKey)
                    Version = CheckFor45PlusVersion(releaseKey);
 
            if (Version == null)
                Version = new Version(4, 0);
        }
 
        // Checking the version using >= will enable forward compatibility.
        private static Version CheckFor45PlusVersion(int releaseKey) {
            if (releaseKey >= 528040)
                return new Version("4.8");
            if (releaseKey >= 461808)
                return new Version("4.7.2");
            if (releaseKey >= 461308)
                return new Version("4.7.1");
            if (releaseKey >= 460798)
                return new Version("4.7");
            if (releaseKey >= 394802)
                return new Version("4.6.2");
            if (releaseKey >= 394254)
                return new Version("4.6.1");
            if (releaseKey >= 393295)
                return new Version("4.6");
            if (releaseKey >= 379893)
                return new Version("4.5.2");
            if (releaseKey >= 378675)
                return new Version("4.5.1");
            if (releaseKey >= 378389)
                return new Version("4.5");
 
            throw new Exception("No 4.5 or later version detected");
        }
    }
}