props/Props/Services/Content/CachedContentManager.cs

using System.IO;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json.Linq;
using Props.Options;

namespace Props.Services.Content
{
    public class CachedContentManager<TPage> : IContentManager<TPage>
    {
        private dynamic data;
        private readonly ContentOptions options;
        private readonly string fileName;

        dynamic IContentManager<TPage>.Json
        {
            get
            {
                if (data == null) data = JValue.Parse(File.ReadAllText(Path.Combine(options.Dir, fileName)));
                return data;
            }
        }

        public CachedContentManager(IConfiguration configuration)
        {
            this.options = configuration.GetSection(ContentOptions.Content).Get<ContentOptions>();
            this.fileName = typeof(TPage).Name.Replace("Model", "") + ".json";
        }
    }
}