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Daily notes on .NET, C#, EF Core, MAUI, Blazor, and Flutter - for developers who ship.

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2026-04-13 dotnet-11 ef-core

EF Core 11 Adds Native SQL Server Vector Search with DiskANN Indexes

EF Core 11 Preview 2 supports SQL Server 2025 VECTOR_SEARCH() and DiskANN vector indexes directly from LINQ. Here is how to set up the index, run approximate queries, and what changes from the EF Core 10 VectorDistance approach.

2026-04-08 csharp dotnet

C# 15 Union Types Are Here: Type Unions Ship in .NET 11 Preview 2

C# 15 introduces the union keyword for type unions with exhaustive pattern matching and implicit conversions. Available now in .NET 11 Preview 2.

2026-04-06 dotnet-11 csharp

.NET 11 Runtime Async Replaces State Machines with Cleaner Stack Traces

Runtime Async in .NET 11 moves async/await handling from compiler-generated state machines into the runtime itself, producing readable stack traces, correct breakpoints, and fewer heap allocations.

2026-10-09 migration flutter ios

Migrate a Flutter iOS App from CocoaPods to Swift Package Manager (Flutter 3.44 to 3.47)

Flutter 3.44 made Swift Package Manager the default for iOS and macOS, but an existing app keeps CocoaPods until you remove it. How to check which plugins are SwiftPM-ready, let the tool migrate the Xcode project, delete the Podfile safely, handle pods-only plugins and custom Podfile logic, and roll back if you need to.

2026-10-09 dotnet semantic-kernel ai-agents

Semantic Kernel 1.81 Stops FileIOPlugin From Leaking Files Outside AllowedFolders

Semantic Kernel .NET 1.81.0 fixes a FileIOPlugin oracle: WriteAsync told the model a file outside AllowedFolders existed, was read-only, and where it lived. Measured before and after.

2026-10-09 ef-core ef-core-11 dotnet-11

What Is a Shadow Property in EF Core 11, and Why Did One Show Up in My Migration?

A shadow property is a column EF Core tracks without a matching CLR property. Here is why EF Core 11 creates them (missing FK properties, misnamed FKs, type mismatches, split relationships), how to spot the BlogId1 kind in a migration, how to fix each cause, and how to use shadow properties on purpose.

2026-10-09 github-copilot copilot-sdk ai-agents

What Is the GitHub Copilot SDK, and What Can You Build With It?

The GitHub Copilot SDK (1.0.18, October 8, 2026) is a thin client for the Copilot CLI runtime: your app speaks JSON-RPC to the same agent loop that powers Copilot CLI, with built-in file and shell tools, MCP, sub-agents, hooks, and BYOK. How it is wired, four things you can build with it, and the defaults that will bite you in production.

2026-10-08 comparison ef-core dotnet

AddDbContextPool vs AddDbContextFactory for running EF Core queries in parallel

AddDbContextPool hands out one scoped DbContext per DI scope, so it cannot run two queries at once. AddDbContextFactory and AddPooledDbContextFactory give you a context per call, which is what parallel queries need. Measured on EF Core 11 RC 1: the pooled factory creates a context in 342 ns and 40 B versus 17 us and 44 KB.

2026-10-08 agent-framework dotnet anthropic

Agent Framework 1.24: The Anthropic Agent Package Is Stable, Except for Beta Services

Microsoft.Agents.AI.Anthropic 1.24.0 drops the preview suffix and depends on Anthropic 12.53.0. Agents built from IAnthropicClient are now stable API, while the client.Beta extensions are marked experimental under MAAIANTHROPIC001, which extension-method calls do not trigger.

2026-10-08 migration flutter impeller

Migrate a Flutter Windows or Linux desktop app to Impeller (Flutter 3.47)

Flutter 3.47 makes Impeller the default renderer on Windows and Linux. What actually changes underneath (it is still OpenGL ES, not Vulkan), how to A/B test against Skia on a built binary, a per-machine kill switch for release builds, and why your golden tests will not notice.

2026-10-08 migration flutter dart

Migrate custom page transitions after the Flutter page transition builders reorganization (Flutter 3.44 to 3.47)

Flutter moved PageTransitionsBuilder and two built-in builders into the widgets layer and CupertinoPageTransitionsBuilder out of Material. What actually breaks (one import, with a misleading 'Not a constant expression' error), what dart fix does and gets wrong for material_ui projects, and how to rewrite custom builders and routes so they no longer depend on Material at all.

2026-10-08 ai-agents github-copilot claude-code

What Is GitHub Agentic Workflows, and How Is It Different From GitHub Actions?

GitHub Agentic Workflows (gh-aw v0.91.5) compiles a Markdown file into a hardened GitHub Actions .lock.yml that runs Copilot, Claude Code, Codex, Gemini or Pi in a read-only, firewalled job and applies writes through safe-outputs. What it adds on top of Actions, the jobs it generates, and when a plain workflow with claude-code-action is still the better tool.

2026-10-07 vscode csharp dotnet-11

C# Dev Kit 11.0 Collapses Six Processes Into One Native AOT Binary

C# Dev Kit 11.0 pre-release replaces six managed processes with a single Native AOT CSDevKit process and a persistent project cache. A 407-project Aspire solution is ready in 3.0s instead of 84.1s, using 316 MB instead of 2,072 MB.

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