This is the generic base repository class that handles data store operations with the Entity classes.

RepositoryBase.cs

using Newtonsoft.Json;
using RecordKeeper.Portable.Models;
using System.IO;
using System.Security.Principal;
using System.Threading;

namespace RecordKeeper.Data.Repositories
{
    public abstract class RepositoryBase<TEntity> where TEntity : EntityBase
    {
        protected readonly IIdentity Identity;
        protected readonly string ConnectionString;

        protected RepositoryBase()
        {
            ConnectionString = "Your Database Connection String Here";
            Identity = Thread.CurrentPrincipal.Identity;
        }

        public static TEntity FromJson(string json)
        {
            TEntity entity;
            JsonSerializer s = new JsonSerializer();
            StringReader sr = new StringReader(json);
            JsonTextReader r = new JsonTextReader(sr);
            entity = s.Deserialize<TEntity>(r);
            return entity;
        }
    }
}