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GeneratedKeysSamples.cs
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GeneratedKeysSamples.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;
namespace GeneratedKeys;
public static class GeneratedKeysSamples
{
public static void Simple_query_and_update_1()
{
Console.WriteLine($">>>> Sample: {nameof(Simple_query_and_update_1)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();
#region Simple_query_and_update_1
using var context = new BlogsContext();
var blog = context.Blogs.Include(e => e.Posts).First(e => e.Name == ".NET Blog");
blog.Name = ".NET Blog (Updated!)";
foreach (var post in blog.Posts.Where(e => !e.Title.Contains("5.0")))
{
post.Title = post.Title.Replace("5", "5.0");
}
context.SaveChanges();
#endregion
Console.WriteLine();
}
public static void Simple_query_and_update_2()
{
Console.WriteLine($">>>> Sample: {nameof(Simple_query_and_update_2)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();
using var context = new BlogsContext();
var blog = context.Blogs.Include(e => e.Posts).First(e => e.Name == ".NET Blog");
blog.Name = ".NET Blog (Updated!)";
foreach (var post in blog.Posts.Where(e => !e.Title.Contains("5.0")))
{
post.Title = post.Title.Replace("5", "5.0");
}
#region Simple_query_and_update_2
context.ChangeTracker.DetectChanges();
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
#endregion
context.SaveChanges();
Console.WriteLine();
}
public static void Query_then_insert_update_and_delete_1()
{
Console.WriteLine($">>>> Sample: {nameof(Query_then_insert_update_and_delete_1)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();
#region Query_then_insert_update_and_delete_1
using var context = new BlogsContext();
var blog = context.Blogs.Include(e => e.Posts).First(e => e.Name == ".NET Blog");
// Modify property values
blog.Name = ".NET Blog (Updated!)";
// Insert a new Post
blog.Posts.Add(
new Post
{
Title = "What’s next for System.Text.Json?", Content = ".NET 5.0 was released recently and has come with many..."
});
// Mark an existing Post as Deleted
var postToDelete = blog.Posts.Single(e => e.Title == "Announcing F# 5");
context.Remove(postToDelete);
context.ChangeTracker.DetectChanges();
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
context.SaveChanges();
#endregion
}
public static void Inserting_new_entities_3()
{
Console.WriteLine($">>>> Sample: {nameof(Inserting_new_entities_3)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
using var context = new BlogsContext();
#region Inserting_new_entities_3
context.Add(
new Blog
{
Name = ".NET Blog",
Posts =
{
new Post
{
Title = "Announcing the Release of EF Core 5.0",
Content = "Announcing the release of EF Core 5.0, a full featured cross-platform..."
},
new Post
{
Title = "Announcing F# 5",
Content = "F# 5 is the latest version of F#, the functional programming language..."
}
}
});
#endregion
Console.WriteLine("Before SaveChanges:");
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
context.SaveChanges();
Console.WriteLine("After SaveChanges:");
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
Console.WriteLine();
}
public static void Attaching_existing_entities_3()
{
Console.WriteLine($">>>> Sample: {nameof(Attaching_existing_entities_3)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();
using var context = new BlogsContext();
#region Attaching_existing_entities_3
context.Attach(
new Blog
{
Id = 1,
Name = ".NET Blog",
Posts =
{
new Post
{
Id = 1,
Title = "Announcing the Release of EF Core 5.0",
Content = "Announcing the release of EF Core 5.0, a full featured cross-platform..."
},
new Post
{
Id = 2,
Title = "Announcing F# 5",
Content = "F# 5 is the latest version of F#, the functional programming language..."
},
new Post
{
Title = "Announcing .NET 5.0",
Content = ".NET 5.0 includes many enhancements, including single file applications, more..."
},
}
});
#endregion
Console.WriteLine("Before SaveChanges:");
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
context.SaveChanges();
Console.WriteLine("After SaveChanges:");
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
Console.WriteLine();
}
public static void Updating_existing_entities_3()
{
Console.WriteLine($">>>> Sample: {nameof(Updating_existing_entities_3)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();
using var context = new BlogsContext();
#region Updating_existing_entities_3
context.Update(
new Blog
{
Id = 1,
Name = ".NET Blog",
Posts =
{
new Post
{
Id = 1,
Title = "Announcing the Release of EF Core 5.0",
Content = "Announcing the release of EF Core 5.0, a full featured cross-platform..."
},
new Post
{
Id = 2,
Title = "Announcing F# 5",
Content = "F# 5 is the latest version of F#, the functional programming language..."
},
new Post
{
Title = "Announcing .NET 5.0",
Content = ".NET 5.0 includes many enhancements, including single file applications, more..."
},
}
});
#endregion
Console.WriteLine("Before SaveChanges:");
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
context.SaveChanges();
Console.WriteLine("After SaveChanges:");
Console.WriteLine(context.ChangeTracker.DebugView.LongView);
Console.WriteLine();
}
public static void Custom_tracking_with_TrackGraph_1()
{
Console.WriteLine($">>>> Sample: {nameof(Custom_tracking_with_TrackGraph_1)}");
Console.WriteLine();
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();
using var context = new BlogsContext();
var blog = context.Blogs.AsNoTracking().Include(e => e.Posts).Single(e => e.Name == ".NET Blog");
#region Custom_tracking_with_TrackGraph_1a
blog.Posts.Add(
new Post
{
Title = "Announcing .NET 5.0",
Content = ".NET 5.0 includes many enhancements, including single file applications, more..."
}
);
var toDelete = blog.Posts.Single(e => e.Title == "Announcing F# 5");
toDelete.Id = -toDelete.Id;
#endregion
UpdateBlog(blog);
Console.WriteLine();
}
#region Custom_tracking_with_TrackGraph_1b
public static void UpdateBlog(Blog blog)
{
using var context = new BlogsContext();
context.ChangeTracker.TrackGraph(
blog, node =>
{
var propertyEntry = node.Entry.Property("Id");
var keyValue = (int)propertyEntry.CurrentValue;
if (keyValue == 0)
{
node.Entry.State = EntityState.Added;
}
else if (keyValue < 0)
{
propertyEntry.CurrentValue = -keyValue;
node.Entry.State = EntityState.Deleted;
}
else
{
node.Entry.State = EntityState.Modified;
}
Console.WriteLine($"Tracking {node.Entry.Metadata.DisplayName()} with key value {keyValue} as {node.Entry.State}");
});
context.SaveChanges();
}
#endregion
}
public static class Helpers
{
public static void RecreateCleanDatabase()
{
using var context = new BlogsContext(quiet: true);
context.Database.EnsureDeleted();
context.Database.EnsureCreated();
}
public static void PopulateDatabase()
{
using var context = new BlogsContext(quiet: true);
context.Add(
new Blog
{
Name = ".NET Blog",
Posts =
{
new Post
{
Title = "Announcing the Release of EF Core 5.0",
Content = "Announcing the release of EF Core 5.0, a full featured cross-platform..."
},
new Post
{
Title = "Announcing F# 5",
Content = "F# 5 is the latest version of F#, the functional programming language..."
},
}
});
context.SaveChanges();
}
}
#region Model
public class Blog
{
public int Id { get; set; }
public string Name { get; set; }
public IList<Post> Posts { get; } = new List<Post>();
}
public class Post
{
public int Id { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public int? BlogId { get; set; }
public Blog Blog { get; set; }
}
#endregion
public class BlogsContext : DbContext
{
private readonly bool _quiet;
public BlogsContext(bool quiet = false)
{
_quiet = quiet;
}
public DbSet<Blog> Blogs { get; set; }
public DbSet<Post> Posts { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder
.EnableSensitiveDataLogging()
.UseSqlite("DataSource=test.db");
if (!_quiet)
{
optionsBuilder.LogTo(Console.WriteLine, new[] { RelationalEventId.CommandExecuted });
}
}
}