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using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
#pragma warning disable 169
namespace Samples
{
public class Program
{
private static void Main()
{
SetupDatabase();
using (var db = new BloggingContext("Diego"))
{
var blogs = db.Blogs
.Include(b => b.Posts)
.ToList();
foreach (var blog in blogs)
{
Console.WriteLine(
$"{blog.Url.PadRight(33)} [Tenant: {db.Entry(blog).Property("TenantId").CurrentValue}]");
foreach (var post in blog.Posts)
{
Console.WriteLine($" - {post.Title.PadRight(30)} [IsDeleted: {post.IsDeleted}]");
}
Console.WriteLine();
}
#region IgnoreFilters
blogs = db.Blogs
.Include(b => b.Posts)
.IgnoreQueryFilters()
.ToList();
#endregion
foreach (var blog in blogs)
{
Console.WriteLine(
$"{blog.Url.PadRight(33)} [Tenant: {db.Entry(blog).Property("TenantId").CurrentValue}]");
foreach (var post in blog.Posts)
{
Console.WriteLine($" - {post.Title.PadRight(30)} [IsDeleted: {post.IsDeleted}]");
}
Console.WriteLine();
}
}
}
private static void SetupDatabase()
{
using (var db = new BloggingContext("diego"))
{
if (db.Database.EnsureCreated())
{
db.Blogs.Add(
new Blog
{
Url = "http://sample.com/blogs/fish",
Posts = new List<Post>
{
new Post { Title = "Fish care 101" },
new Post { Title = "Caring for tropical fish" },
new Post { Title = "Types of ornamental fish" }
}
});
db.Blogs.Add(
new Blog
{
Url = "http://sample.com/blogs/cats",
Posts = new List<Post>
{
new Post { Title = "Cat care 101" },
new Post { Title = "Caring for tropical cats" },
new Post { Title = "Types of ornamental cats" }
}
});
db.SaveChanges();
using (var andrewDb = new BloggingContext("andrew"))
{
andrewDb.Blogs.Add(
new Blog
{
Url = "http://sample.com/blogs/catfish",
Posts = new List<Post>
{
new Post { Title = "Catfish care 101" },
new Post { Title = "History of the catfish name" }
}
});
andrewDb.SaveChanges();
}
db.Posts
.Where(
p => p.Title == "Caring for tropical fish"
|| p.Title == "Cat care 101")
.ToList()
.ForEach(p => db.Posts.Remove(p));
db.SaveChanges();
}
}
}
}
public class BloggingContext : DbContext
{
private readonly string _tenantId;
public BloggingContext(string tenant)
{
_tenantId = tenant;
}
public DbSet<Blog> Blogs { get; set; }
public DbSet<Post> Posts { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder
.UseSqlServer(
@"Server=(localdb)\mssqllocaldb;Database=Demo.QueryFilters;Trusted_Connection=True;ConnectRetryCount=0;")
.UseLoggerFactory(new LoggerFactory().AddConsole((s, l) => l == LogLevel.Information && !s.EndsWith("Connection")));
}
#region Configuration
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Blog>().Property<string>("TenantId").HasField("_tenantId");
// Configure entity filters
modelBuilder.Entity<Blog>().HasQueryFilter(b => EF.Property<string>(b, "TenantId") == _tenantId);
modelBuilder.Entity<Post>().HasQueryFilter(p => !p.IsDeleted);
}
#endregion
public override int SaveChanges()
{
ChangeTracker.DetectChanges();
foreach (var item in ChangeTracker.Entries().Where(
e =>
e.State == EntityState.Added && e.Metadata.GetProperties().Any(p => p.Name == "TenantId")))
{
item.CurrentValues["TenantId"] = _tenantId;
}
foreach (var item in ChangeTracker.Entries<Post>().Where(e => e.State == EntityState.Deleted))
{
item.State = EntityState.Modified;
item.CurrentValues["IsDeleted"] = true;
}
return base.SaveChanges();
}
}
#region Entities
public class Blog
{
private string _tenantId;
public int BlogId { get; set; }
public string Name { get; set; }
public string Url { get; set; }
public List<Post> Posts { get; set; }
}
public class Post
{
public int PostId { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public bool IsDeleted { get; set; }
public int BlogId { get; set; }
public Blog Blog { get; set; }
}
#endregion
}