// Entity Framework Plus

// Doc: https://entityframework-plus.net/query-include-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();

​

        // Update: UPDATE all rows from the database using a LINQ Query without loading entities in the context.

        using (var context = new EntityContext())

        {

            int myRoleID = 1;

            // LOAD posts and available comments for the role level.

            var list = context.Posts.IncludeFilter(x => x.Comments.Where(y => y.RoleId >= myRoleID))

                                .ToList();

​

            foreach (var post in list)

            {

                Console.WriteLine("{0} : Active comments ({1})", post.Content, post.Comments.Count);

            }

        }

    }

​

    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 = "User" });

​

            context.Blogs.Add(new Blog() { Title = "Blog_A", IsSoftDeleted = true });

            context.Blogs.Add(new Blog() { Title = "Blog_B", IsSoftDeleted = true });

​

            context.SaveChanges();

​

            context.Posts.Add(new Post() { Content = "Post 1 in Blog_A", Date = DateTime.Now.AddDays(-4), IsSoftDeleted = false, Price = 35, BlogId = 1 });

            context.Posts.Add(new Post() { Content = "Post 2 in Blog_A", Date = DateTime.Now.AddDays(-4), IsSoftDeleted = true, Price = 22, BlogId = 1 });

            context.Posts.Add(new Post() { Content = "Post 1 in Blog_B", Date = DateTime.Now.AddDays(-5), IsSoftDeleted = false, Price = 37, BlogId = 2 });

            context.Posts.Add(new Post() { Content = "Post 2 in Blog_B", Date = DateTime.Now.AddDays(-5), IsSoftDeleted = false, Price = 7, BlogId = 2 });

​

            context.SaveChanges();

​

            context.Comments.Add(new Comment() { Text = "Comment 1 in post 1", IsSoftDeleted = false, PostId = 1, RoleId = 1 });

            context.Comments.Add(new Comment() { Text = "Comment 2 in post 1", IsSoftDeleted = false, PostId = 1, RoleId = 3 });

            context.Comments.Add(new Comment() { Text = "Comment 3 in post 1", IsSoftDeleted = false, PostId = 2, RoleId = 0 });

            context.Comments.Add(new Comment() { Text = "Comment 1 in post 3", IsSoftDeleted = false, PostId = 3, RoleId = 3 });

            context.Comments.Add(new Comment() { Text = "Comment 2 in post 3", IsSoftDeleted = false, PostId = 4, RoleId = 1 });

            context.Comments.Add(new Comment() { Text = "Comment 3 in post 3", IsSoftDeleted = false, PostId = 4, RoleId = 1 });

​

            context.SaveChanges();

        }

    }

​

​

​

    public class EntityContext : DbContext

    {

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

        {

​

        }

        public DbSet<Blog> Blogs { get; set; }

        public DbSet<Post> Posts { get; set; }

        public DbSet<Comment> Comments { get; set; }

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

    }

​

    public class Blog

    {

        public int BlogId { get; set; }

        public string Title { get; set; }

        public bool IsSoftDeleted { get; set; }

        public List<Post> Posts { get; set; }

    }

​

    public class Post

    {

        public int PostId { get; set; }

        public string Content { get; set; }

        public DateTime Date { get; set; }

        public bool IsSoftDeleted { get; set; }

        public int Price { get; set; }

        public int BlogId { get; set; }

        public int RoleId { get; set; }

        public List<Comment> Comments { get; set; }

    }

​

    public class Comment

    {

        public int CommentId { get; set; }

        public string Text { get; set; }

        public bool IsSoftDeleted { get; set; }

        public int PostId { get; set; }

        public int RoleId { get; set; }

    }

​

    public class Role

    {

        public int RoleId { get; set; }

        public string Name { get; set; }

    }

}