source: binary-improvements/7dtd-server-fixes/src/Mods.cs@ 226

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using UnityEngine;

namespace AllocsFixes
{
        public static class Mods {
                public class ModData {
                        public Assembly assembly;
                        public string name;
                        public string version;
                        public ModAPI apiInstance;
                }

                private static readonly string MOD_PATH = Application.dataPath + "/../Mods";
                private static Dictionary<string, ModData> loadedMods = new Dictionary<string, ModData> ();

                public static void LoadMods () {
                        if (Directory.Exists (MOD_PATH)) {
                                Log.Out ("Loading mods");

                                foreach (string modDir in Directory.GetDirectories (MOD_PATH)) {
                                        foreach (string modDll in Directory.GetFiles (modDir, "*.dll")) {
                                                try {
                                                        Assembly assemblyInstance = Assembly.LoadFrom (modDll);

                                                        ModData md = new ModData ();
                                                        md.assembly = assemblyInstance;

                                                        md.apiInstance = CreateApiInstance (md);
                                                        if (md.apiInstance == null) {
                                                                Log.Warning ("DLL does not declare a class of type ModAPI, ignoring");
                                                                continue;
                                                        }
                                                        if (string.IsNullOrEmpty (md.apiInstance.ModName ())) {
                                                                Log.Warning ("DLL's ModAPI does not override ModName(), ignoring");
                                                                continue;
                                                        }
                                                        if (loadedMods.ContainsKey (md.apiInstance.ModName ())) {
                                                                Log.Warning ("DLL's ModAPI.ModName() returns name that's already loaded, ignoring");
                                                                continue;
                                                        }
                                                        md.name = md.apiInstance.ModName ();
                                                        md.version = md.apiInstance.ModVersion ();

                                                        loadedMods.Add (md.name, md);

                                                        Log.Out ("Loaded mod: " + md.name + " (" + md.version + ")");
                                                } catch (Exception e) {
                                                        Log.Error ("Failed loading DLL");
                                                        Log.Exception (e);
                                                }
                                        }
                                }

                                Log.Out ("Loading mods done");
                        } else {
                                Log.Out ("No mods folder found");
                        }
                }

                public static bool ModLoaded (string _modName) {
                        return loadedMods.ContainsKey (_modName);
                }

                public static Assembly GetModAssembly (string _modName) {
                        if (ModLoaded (_modName)) {
                                return loadedMods [_modName].assembly;
                        }
                        return null;
                }

                public static List<ModData> LoadedMods () {
                        List<ModData> res = new List<ModData> ();
                        foreach (ModData md in loadedMods.Values) {
                                res.Add (md);
                        }
                        return res;
                }

                private static ModAPI CreateApiInstance (ModData _md) {
                        Type modApiType = typeof (ModAPI);
                        foreach (Type t in _md.assembly.GetTypes ()) {
                                if (modApiType.IsAssignableFrom (t)) {
                                        Log.Out ("Found ModAPI");

                                        return Activator.CreateInstance(t) as ModAPI;
                                }
                        }
                        return null;
                }

                public static void CallGameAwake () {
                        foreach (ModData md in loadedMods.Values) {
                                if (md.apiInstance != null) {
                                        md.apiInstance.GameAwake ();
                                }
                        }
                }

                public static void CallGameShutdown () {
                        foreach (ModData md in loadedMods.Values) {
                                if (md.apiInstance != null) {
                                        md.apiInstance.GameShutdown ();
                                }
                        }
                }

                public static void CallSavePlayerData (int _clientId, PlayerDataFile _playerDataFile) {
                        foreach (ModData md in loadedMods.Values) {
                                if (md.apiInstance != null) {
                                        md.apiInstance.SavePlayerData (_clientId, _playerDataFile);
                                }
                        }
                }

                public static void CallRequestToSpawnPlayer (int _clientId, string _name, int _chunkViewDim, PlayerProfile _playerProfile) {
                        foreach (ModData md in loadedMods.Values) {
                                if (md.apiInstance != null) {
                                        md.apiInstance.RequestToSpawnPlayer (_clientId, _name, _chunkViewDim, _playerProfile);
                                }
                        }
                }

                public static void CallPlayerDisconnected (ClientInfo _cInfo, bool _bShutdown) {
                        foreach (ModData md in loadedMods.Values) {
                                if (md.apiInstance != null) {
                                        md.apiInstance.PlayerDisconnected (_cInfo, _bShutdown);
                                }
                        }
                }

                public static void CallCalcMapColors (Chunk _chunk) {
                        foreach (ModData md in loadedMods.Values) {
                                if (md.apiInstance != null) {
                                        md.apiInstance.CalcMapColors (_chunk);
                                }
                        }
                }

        
        }
}