Entity Framework + SQLite

Нужно же еще с нугет подтянуть библиотечки для работы EF c SQLite, конкретно System.Data.SQLite.

Лично я так делал, немного не по хипстерски, зато работает.

        private static SQLiteConnection CreateConnection(string path)
        {
            var builder = (SQLiteConnectionStringBuilder)SQLiteProviderFactory.Instance.CreateConnectionStringBuilder();
            if (builder == null) return null;
            builder.DataSource = path;
            builder.FailIfMissing = false;
            return new SQLiteConnection(builder.ToString());
        }
        /// <summary>
        /// Контекст для создания БД
        /// </summary>
        private sealed class AppDbContext : DbContext
        {
            public AppDbContext() : base(CreateConnection(DataBaseConnectionString), false)
            {
            }
            public DbSet<Account> Accounts { get; set; }
            public DbSet<Group> Groups { get; set; }
            public DbSet<TaskBase> Tasks { get; set; }
            protected override void OnModelCreating(DbModelBuilder modelBuilder)
            {
                if (!File.Exists(DataBaseConnectionString))
                {
                    var initializer = new SQLite.CodeFirst.SqliteDropCreateDatabaseAlways<AppDbContext>(modelBuilder);
                    Database.SetInitializer(initializer);
                    base.OnModelCreating(modelBuilder);
                }
            }

В App.config (или Web.config в случае ASP)

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
  </startup>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="System.Data.SQLite" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
      <provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
    </providers>
  </entityFramework>
<system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SQLite.EF6" />
      <add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".NET Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" />
    <remove invariant="System.Data.SQLite" /><add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".NET Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" /></DbProviderFactories>
  </system.data></configuration>