// Entity Framework Plus

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

​

// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Plus.EF6

​

using System;

using System.Linq;

using System.Data.Entity;

using System.Collections.Generic;

using Z.EntityFramework.Plus;

​

public class Program

{

    public static void Main()

    {

        GenerateData();

​

        using (var context = new EntityContext())

        {

            int myApplicationID = 9;

            int myCustomerID = 2;

​

            // CREATE filter by interface

            context.Filter<IApplication>(q => q.Where(x => x.ApplicationId == myApplicationID));

​

            // SELECT * FROM Invoice WHERE ApplicationID = 9 and CustomerID = 2

            var list = context.Invoices.Where(x => x.CustomerId == myCustomerID).ToList();

            FiddleHelper.WriteTable(list);

        }

    }

​

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name = "Customer_A", ApplicationId = 3 });

            context.Customers.Add(new Customer() { Name = "Customer_B", ApplicationId = 9 });

            context.Customers.Add(new Customer() { Name = "Customer_B", ApplicationId = 5 });

​

            context.Invoices.Add(new Invoice() { Date = DateTime.Now.AddDays(-3), CustomerId = 1 });

            context.Invoices.Add(new Invoice() { Date = DateTime.Now.AddDays(4), CustomerId = 2 });

            context.Invoices.Add(new Invoice() { Date = DateTime.Now.AddDays(1), CustomerId = 2 });

            context.Invoices.Add(new Invoice() { Date = DateTime.Now.AddDays(1), CustomerId = 3 });

​

            context.SaveChanges();

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

​

        }

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

        public DbSet<Invoice> Invoices { get; set; }

    }

​

    public interface IApplication

    {

        int ApplicationId { get; set; }

    }

​

    public class Customer : IApplication

    {

        public int CustomerId { get; set; }

        public string Name { get; set; }

        public int ApplicationId { get; set; }

        public List<Invoice> Invoices { get; set; }

    }

​

    public class Invoice

    {

        public int InvoiceId { get; set; }

        public DateTime Date { get; set; }

        public int CustomerId { get; set; }

    }

}