// 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())

        {

            context.Filter<Customer>(MyEnum.EnumValue1, q => q.Where(x => x.IsActive), false);

​

            // SELECT * FROM Customer WHERE IsActive = true

            var list = context.Customers.Filter(MyEnum.EnumValue1).ToList();

            FiddleHelper.WriteTable("After Filtering", list);   

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name ="Customer_A", IsActive = false  });

            context.Customers.Add(new Customer() { Name ="Customer_B", IsActive = true });

            context.Customers.Add(new Customer() { Name ="Customer_C", IsActive = false });

​

            context.SaveChanges();  

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("Before Filtering", context.Customers.ToList());    

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

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

​

            base.OnConfiguring(optionsBuilder);

        }

        public DbSet<Customer> Customers { get; set; }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public Boolean IsActive { get; set; }

    }

    public enum MyEnum

    {

        EnumValue1,

        EnumValue2,

        EnumValue3

    }

}