// 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())

        {

            int myRoleID = 1;

​

            // CREATE filter by interface

            context.Filter<Post>(x => x.Where(q => q.RoleId >= myRoleID));

​

            // SELECT * FROM Posts WHERE RoleID >= 1

            var list = context.Posts.ToList();

        }

    }

​

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Roles.Add(new Role() { Name = "Administrator" });

            context.Roles.Add(new Role() { Name = "HR" });

            context.Roles.Add(new Role() { Name = "Media" });

​

            context.Posts.Add(new Post() { Name = "Post_A", RoleId = 1 });

            context.Posts.Add(new Post() { Name = "Post_B", RoleId = 2 });

            context.Posts.Add(new Post() { Name = "Post_C", RoleId = 0 });

            context.Posts.Add(new Post() { Name = "Post_D", RoleId = 0 });

​

            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<Post> Posts { get; set; }

        public DbSet<Role> Roles { get; set; }

    }

​

​

    public class Post

    {

        public int PostId { get; set; }

        public string Name { get; set; }

        public int RoleId { get; set; }

    }

​

    public class Role

    {

        public int RoleId { get; set; }

        public string Name { get; set; }

    }

}