Add SQLite value generation documentation and samples

Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

Author: Copilot

entity-framework/core/providers/sqlite/index.md

@@ -34,3 +34,7 @@ Install-Package Microsoft.EntityFrameworkCore.Sqlite
 ## Limitations
 
 See [SQLite Limitations](xref:core/providers/sqlite/limitations) for some important limitations of the SQLite provider.
+
+## Additional Resources
+
+* [SQLite Value Generation](xref:core/providers/sqlite/value-generation) - Information about SQLite AUTOINCREMENT and value generation patterns.

entity-framework/core/providers/sqlite/value-generation.md

@@ -0,0 +1,92 @@
+---
+title: SQLite Database Provider - Value Generation - EF Core
+description: Value Generation Patterns Specific to the SQLite Entity Framework Core Database Provider
+author: AndriySvyryd
+ms.date: 09/26/2025
+uid: core/providers/sqlite/value-generation
+---
+# SQLite Value Generation
+
+This page details value generation configuration and patterns that are specific to the SQLite provider. It's recommended to first read [the general page on value generation](xref:core/modeling/generated-properties).
+
+## AUTOINCREMENT columns
+
+By convention, numeric primary key columns that are configured to have their values generated on add are set up with SQLite's AUTOINCREMENT feature. Starting with EF Core 10, SQLite AUTOINCREMENT is a first-class feature with full support through conventions and the Fluent API.
+
+### Configuring AUTOINCREMENT
+
+Starting with EF Core 10, you can explicitly configure a property to use SQLite AUTOINCREMENT using the new Fluent API:
+
+```csharp
+protected override void OnModelCreating(ModelBuilder modelBuilder)
+{
+    modelBuilder.Entity<Blog>()
+        .Property(b => b.Id)
+        .UseAutoincrement();
+}
+```
+
+You can also configure AUTOINCREMENT using the annotation API:
+
+[!code-csharp[Main](../../../../samples/core/Sqlite/ValueGeneration/SqliteAutoincrement.cs?name=SqliteAutoincrement&highlight=5)]
+
+This is equivalent to using the more general value generation API:
+
+```csharp
+protected override void OnModelCreating(ModelBuilder modelBuilder)
+{
+    modelBuilder.Entity<Blog>()
+        .Property(b => b.Id)
+        .ValueGeneratedOnAdd();
+}
+```
+
+By convention, integer primary keys are automatically configured with AUTOINCREMENT when they don't have an explicitly assigned value.
+
+### Working with value converters
+
+Starting with EF Core 10, SQLite AUTOINCREMENT works properly with value converters. Previously, properties with value converters weren't able to configure AUTOINCREMENT. For example:
+
+[!code-csharp[Main](../../../../samples/core/Sqlite/ValueGeneration/SqliteAutoincrementWithValueConverter.cs?name=SqliteAutoincrementWithValueConverter&highlight=6)]
+
+In earlier versions of EF Core, this scenario would not work correctly and migrations would keep regenerating the same AlterColumn operation even without model changes.
+
+## Disabling AUTOINCREMENT for default SQLite value generation
+
+In some cases, you may want to disable AUTOINCREMENT and use SQLite's default value generation behavior instead. You can do this using the Metadata API:
+
+[!code-csharp[Main](../../../../samples/core/Sqlite/ValueGeneration/SqliteValueGenerationStrategyNone.cs?name=SqliteValueGenerationStrategyNone&highlight=5)]
+
+Alternatively, you can disable value generation entirely:
+
+```csharp
+protected override void OnModelCreating(ModelBuilder modelBuilder)
+{
+    modelBuilder.Entity<Blog>()
+        .Property(b => b.Id)
+        .ValueGeneratedNever();
+}
+```
+
+This means that it's up to the application to supply a value for the property before saving to the database.
+
+## Migration behavior
+
+When EF Core generates migrations for SQLite AUTOINCREMENT columns, the generated migration will include the `Sqlite:Autoincrement` annotation:
+
+```csharp
+migrationBuilder.CreateTable(
+    name: "Blogs",
+    columns: table => new
+    {
+        Id = table.Column<int>(type: "INTEGER", nullable: false)
+            .Annotation("Sqlite:Autoincrement", true),
+        Title = table.Column<string>(type: "TEXT", nullable: true)
+    },
+    constraints: table =>
+    {
+        table.PrimaryKey("PK_Blogs", x => x.Id);
+    });
+```
+
+This ensures that the AUTOINCREMENT feature is properly applied when the migration is executed against the SQLite database.

samples/core/Sqlite/ValueGeneration/Program.cs

@@ -0,0 +1,2 @@
+// This file is for documentation samples only.
+// The actual implementation code is in the individual sample files.

samples/core/Sqlite/ValueGeneration/SqliteAutoincrement.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace EFCore.Sqlite.ValueGeneration;
+
+internal class SqliteAutoincrementContext : DbContext
+{
+    public DbSet<Blog> Blogs { get; set; }
+
+    #region SqliteAutoincrement
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Blog>()
+            .Property(b => b.Id)
+            .HasAnnotation("Sqlite:Autoincrement", true);
+    }
+    #endregion
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        => optionsBuilder.UseSqlite("Data Source=sample.db");
+}
+
+public class Blog
+{
+    public int Id { get; set; }
+    public string Title { get; set; }
+}

samples/core/Sqlite/ValueGeneration/SqliteAutoincrementWithValueConverter.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace EFCore.Sqlite.ValueGeneration;
+
+public readonly struct BlogId
+{
+    public BlogId(int value) => Value = value;
+    public int Value { get; }
+    
+    public static implicit operator int(BlogId id) => id.Value;
+    public static implicit operator BlogId(int value) => new(value);
+}
+
+internal class SqliteAutoincrementWithValueConverterContext : DbContext
+{
+    public DbSet<BlogPost> Blogs { get; set; }
+
+    #region SqliteAutoincrementWithValueConverter
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<BlogPost>()
+            .Property(b => b.Id)
+            .HasConversion<int>()
+            .HasAnnotation("Sqlite:Autoincrement", true);
+    }
+    #endregion
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        => optionsBuilder.UseSqlite("Data Source=sample.db");
+}
+
+public class BlogPost
+{
+    public BlogId Id { get; set; }
+    public string Title { get; set; }
+}

samples/core/Sqlite/ValueGeneration/SqliteValueGeneration.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>disable</Nullable>
+    <OutputType>Library</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.0" />
+  </ItemGroup>
+
+</Project>

samples/core/Sqlite/ValueGeneration/SqliteValueGenerationStrategyNone.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace EFCore.Sqlite.ValueGeneration;
+
+internal class SqliteValueGenerationStrategyNoneContext : DbContext
+{
+    public DbSet<Post> Posts { get; set; }
+
+    #region SqliteValueGenerationStrategyNone
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Post>()
+            .Property(p => p.Id)
+            .HasAnnotation("Sqlite:ValueGenerationStrategy", "None");
+    }
+    #endregion
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        => optionsBuilder.UseSqlite("Data Source=sample.db");
+}
+
+public class Post
+{
+    public int Id { get; set; }
+    public string Content { get; set; }
+}