// Entity Framework Plus

// Doc: https://entityframework-plus.net/query-filter

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

// @nuget: Z.EntityFramework.Plus.EFCore

​

using System;

using System.Linq;

using Z.EntityFramework.Plus;

using Microsoft.EntityFrameworkCore;

using Microsoft.Data.SqlClient;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        GenerateData();

​

        using (var context = new EntityContext())

        {

            // CREATE filter by inheritance

            context.Filter<BaseDog>(q => q.Where(x => !x.IsDangerous));

​

            // CREATE filter by interface

            context.Filter<IAnimal>(q => q.Where(x => x.IsDomestic));

​

            // SELECT * FROM Cat WHERE IsDomestic = true

            var cats = context.Cats.ToList();

​

            // SELECT * FROM Dog WHERE IsDomestic = true AND IsDangerous = false

            var dogs = context.Dogs.ToList();

            FiddleHelper.WriteTable("Cats", cats);

            FiddleHelper.WriteTable("Dogs", dogs);

        }

    }

​

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Dogs.Add(new Dog() { Name = "Dog_A", Age = 3, IsDangerous = true, IsDomestic = true });

            context.Dogs.Add(new Dog() { Name = "Dog_B", Age = 7, IsDangerous = false, IsDomestic = true });

            context.Dogs.Add(new Dog() { Name = "Dog_C", Age = 4, IsDangerous = true, IsDomestic = false });

​

            context.Cats.Add(new Cat() { Name = "Cat_A", Age = 1, IsDomestic = true });

            context.Cats.Add(new Cat() { Name = "Cat_B", Age = 2, IsDomestic = true });

            context.Cats.Add(new Cat() { Name = "Cat_C", Age = 1, IsDomestic = false });

​

            context.SaveChanges();

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

​

            base.OnConfiguring(optionsBuilder);

        }

        public DbSet<Dog> Dogs { get; set; }

        public DbSet<Cat> Cats { get; set; }

    }

​

    interface IAnimal

    {

        string Name { get; set; }

        int Age { get; set; }

        bool IsDomestic { get; set; }

    }

​

    public class BaseDog : IAnimal

    {

        public int DogId { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public bool IsDomestic { get; set; }

        public bool IsDangerous { get; set; }

    }

​

    public class Dog : BaseDog

    { }

​

    public class Cat : IAnimal

    {

        public int CatId { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public bool IsDomestic { get; set; }

    }

}