// Entity Framework Classic

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

​

// @nuget: Z.EntityFramework.Classic

​

using System;

using System.Linq;

using System.Data.Entity;

​

public class Program

{

    public static int ApplicationTenantID = 1;

    public static void Main()

    {

        GenerateData();

​

        using (var context = new EntityContext())

        {

            // SELECT * FROM Customers WHERE TenantID = 1

            var list = context.Customers.ToList();

            FiddleHelper.WriteTable("Customers", list);         

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { TenantID = 1, Name = "Customer_A", Description = "Description" });

            context.Customers.Add(new Customer() { TenantID = 1, Name = "Customer_B", Description = "Description" });           

            context.Customers.Add(new Customer() { TenantID = 2, Name = "Customer_C", Description = "Description" });

            context.SaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

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

        {

            // Add your Global Query Filter here

            this.Configuration.QueryFilter.Filter<ITenant>(x => x.TenantID == ApplicationTenantID);

        }

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

    }

    public interface ITenant

    {

        int TenantID { get; set; }

    }

    public class Customer : ITenant

    {

        public int CustomerID { get; set; }

        public int TenantID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

    }

}