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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.

2026-09-27 ag-ui dotnet ai-agents

AG-UI .NET SDK 1.0: AGUI.Server and AGUI.Client Move the Protocol Out of Agent Framework

The AG-UI protocol now has a standalone .NET SDK: AGUI.Server 1.0.0 streams any IChatClient as AG-UI events over SSE, and AGUIChatClient consumes an AG-UI endpoint as an IChatClient, down to .NET Framework 4.7.2. Agent Framework users get renamed APIs.

2026-09-27 errors dotnet dotnet-10

Fix: MediaPicker.CapturePhotoAsync returns a PNG instead of a JPEG in .NET MAUI 10

On iOS, MAUI 10 re-encodes camera photos as PNG whenever CompressionQuality is 90 or higher and no MaximumWidth/Height is set, which includes the default. Set CompressionQuality to 89 or lower, or add a MaximumWidth on iOS only.

2026-09-27 ef-core ef-core-11 sql-server

How to add a unique index on a JSON-mapped property in EF Core 11 (SQL Server and SQLite)

HasIndex(...).IsUnique() on a ToJson() member does not enforce uniqueness in EF Core 11 RC 1: SQL Server drops IsUnique and SQLite indexes the whole document. Expose the JSON value as a computed column and put the unique index on that instead.

2026-09-27 dart flutter vs-code

How to speed up a slow Dart analysis server in VS Code for a large Flutter monorepo

A monorepo with dozens of pubspec.yaml files makes the Dart analysis server build one analysis context per package, which is where the memory and the minute-long startup go. Convert to a pub workspace, exclude generated code in analysis_options.yaml, drop legacy analyzer plugins, and use the Insights page to prove it. Measured on Dart 3.12.2: 2.3x less peak memory and half the cold analysis time.

2026-09-27 ai-agents claude-code security

How to Run a Coding Agent in a Disposable VM or Container Instead of on Your Laptop

Dev containers, Docker Sandboxes microVMs, Lima VMs, and hosted cloud sandboxes all move Claude Code, Codex, or Copilot CLI off your host. What each one actually isolates, the exact commands to make it throwaway, and the two things none of them protect: your writable workspace and your git hooks.

2026-09-26 errors flutter flutter-web

Fix: Flutter debugger jumps into binding.dart on hot reload with no error shown

A dwds bug in Flutter 3.35 web sent a fake pause on every hot reload. Upgrade to Flutter 3.38+, or switch VS Code back to 'Debug my code' so package frames are skipped.

2026-09-26 errors flutter webview

Fix: YouTube embed shows "Video unavailable" (Error 152 / 153) in Flutter with youtube_player_iframe

Error 153 means YouTube got no Referer; 152 means the page claims to be youtube.com. Upgrade youtube_player_iframe to 6.0.2 and set origin to https://<your app id>, or use youtube-nocookie on 5.x.

2026-09-26 dotnet ai microsoft-extensions-ai

Microsoft.Extensions.AI.OpenAI 10.10.1 Fixes the OpenAI 2.14 TypeLoadException

OpenAI 2.14.0 renamed GlobalMcpToolCallApprovalPolicy, which broke every tool-carrying Responses call through Microsoft.Extensions.AI.OpenAI 10.10.0. Version 10.10.1 moves to OpenAI 2.14.0 and also picks up the null reasoning status fix for OpenAI-compatible endpoints.

2026-09-25 errors aspnetcore dotnet-10

Fix: ASP.NET Core returns 400 "The X field is required" for a non-nullable string property

With <Nullable>enable</Nullable>, MVC treats every non-nullable reference type as [Required(AllowEmptyStrings = true)]. Mark optional properties as string?, give them a default, or set SuppressImplicitRequiredAttributeForNonNullableReferenceTypes.

2026-09-25 errors flutter android

Fix: e: Daemon compilation failed: null in a Flutter Android Gradle build

On Windows, Kotlin incremental compilation fails when the Flutter project and the pub cache sit on different drives. Move PUB_CACHE to the project's drive or turn off IC for pub-cache plugins.

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