ModContentManager.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using Terraria.ModLoader;

namespace Loot.Api.ModContent
{
    public class ModContentManager
    {
        private IDictionary<string, TextureModContent> _contents;
        private IEnumerable<TextureModContent> _modContents => _contents.Select(x => x.Value);

        public T GetContent<T>() where T : TextureModContent
            => (T) _modContents.FirstOrDefault(x => x.GetType() == typeof(T));

        public TextureModContent GetContent(Type type)
            => _modContents.FirstOrDefault(x => x.GetType() == type);

        public TextureModContent GetContent(string key)
            => _contents.TryGetValue(key, out var modContent) ? modContent : null;

        public void AddContent(string key, TextureModContent textureModContent)
        {
            if (_contents.ContainsKey(key))
            {
                throw new Exception($"Key '{key}' already present in ContentManager");
            }

            if (_contents.Values.Contains(textureModContent))
            {
                Loot.Logger.WarnFormat("ModContent with registry key {0} was already present", textureModContent.GetRegistryKey());
            }

            textureModContent._Initialize();
            _contents.Add(key, textureModContent);
        }

        internal void Initialize(Mod mod)
        {
            _contents = new Dictionary<string, TextureModContent>();
            var assembly = mod.Code;
            var modContents = assembly.GetTypes().Where(x => x.BaseType == typeof(TextureModContent) && !x.IsAbstract);
            foreach (var modContent in modContents)
            {
                TextureModContent obj = (TextureModContent) Activator.CreateInstance(modContent);
                AddContent(obj.GetRegistryKey(), obj);
            }
        }

        internal void Load()
        {
            foreach (var content in _modContents)
            {
                content._Load();
            }
        }

        internal void Unload()
        {
            foreach (var content in _modContents)
            {
                content._Unload();
            }

            _contents = null;
        }
    }
}