// 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 CurrentRoleId = 1; // admin

    public static void Main()

    {

        GenerateData();

​

        using (var context = new EntityContext())

        {

            var list = context.Customers.ToList();

            FiddleHelper.WriteTable("Customers", list);         

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Type = CustomerType.Employee, Name = "Customer_A", Description = "Description" });

            context.Customers.Add(new Customer() { Type = CustomerType.Web, Name = "Customer_B", Description = "Description", IsDeleted = true });          

            context.Customers.Add(new Customer() { Type = CustomerType.Web, Name = "Customer_C", Description = "Description" });

            context.SaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

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

        {

            this.Configuration.QueryFilter.Filter<ISoftDelete>(customer => !customer.IsDeleted || CurrentRoleId == 1);

            this.Configuration.QueryFilter.Filter<Customer>(customer => customer.Type == CustomerType.Web || CurrentRoleId == 1);

        }

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

    }

    public interface ISoftDelete

    {

        bool IsDeleted { get; set; }

    }

    public class Customer : ISoftDelete

    {

        public int CustomerID { get; set; }

        public CustomerType Type { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

        public bool IsDeleted { get; set; }

    }

    public enum CustomerType

    {

        Employee,

        Web

    }

}