// Entity Framework Plus

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

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

        using (var context = new EntityContext())

        {

            // LOAD blogs and related active posts and comments.

            var list = context.Blogs.IncludeFilter(x => x.Posts.Where(y => !y.IsSoftDeleted))

                .IncludeFilter(x => x.Posts.Where(y => !y.IsSoftDeleted)

                    .SelectMany(y => y.Comments.Where(z => !z.IsSoftDeleted)))

                .ToList();

​

            foreach (var blog in list)

            {

                Console.WriteLine("Active posts in {0}: {1}", blog.Title, blog.Posts.Count());

​

                foreach (var post in blog.Posts)

                {

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

                }

            }

​

            int i = 0;

​

            //FiddleHelper.WriteTable("After Filtering", list);

        }

    }

​

    public static void GenerateData()

    {

​

        using (var context = new EntityContext())

        {

            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 });

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

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

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

​

            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<Blog> Blogs { get; set; }

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

        public DbSet<Comment> Comments { 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 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; }

    }

}