Start Debugging

EN

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

Start here › Tags Archive

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.

2026-09-22 flutter dart webview

How to block a Flutter WebView from navigating to external URLs with NavigationDelegate

Keep a Flutter WebView on your own domain with webview_flutter 4.14.1: parse the URL, compare Uri.host instead of startsWith, hand mailto: and tel: to url_launcher, and know what Android and iOS actually send to onNavigationRequest.

2026-09-22 aspnetcore dotnet-11 minimal-apis

How to disable antiforgery validation for a single minimal API form endpoint in ASP.NET Core 11

Call .DisableAntiforgery() on the one endpoint, or on a MapGroup. In ASP.NET Core 11 that opts out of both the token middleware and the new automatic CSRF check. Measured matrix, precedence traps, and narrower alternatives.

2026-09-22 flutter dart android

How to keep Flutter location tracking running in the background on Android 15

Run a Flutter location tracker that survives the Home button, a swipe from recents and a reboot on Android 15 and 16: a location-typed foreground service in its own Flutter engine, the exact permissions, and the SecurityException you get when the while-in-use rules bite. Tested with geolocator 14.0.3 and flutter_foreground_task 11.0.3.

2026-09-22 dotnet opentelemetry observability

OpenTelemetry .NET 1.19.1 fixes the wildcard NotSupportedException on net8.0

OpenTelemetry 1.19.0 switched its wildcard source regex to RegexOptions.NonBacktracking, which throws on net8.0 once you register enough sources. 1.19.1, released on September 21, 2026, goes back to a compiled regex with a match timeout.

2026-09-22 comparison ai-agents claude-code

Side Chats vs Subagents: When to Branch a Conversation and When to Delegate

A side chat branches off what the agent already knows; a subagent goes and finds out something new. Claude Code's /btw has no tools at all, Cursor's /btw opens a full agent, and a plain subagent sees none of your conversation. A decision guide for Claude Code 2.1.278 and Cursor 3.11+.

2026-09-21 aspire kafka dotnet

Aspire 13.5.4 Stops Kafka Health Checks From Leaking a Producer on Every Probe

Before Aspire 13.5.4, every AppHost health check on an AddKafka resource created a new Confluent producer that nobody disposed, so polling threads piled up and the AppHost burned CPU. The fix, and the HealthCheckRegistration.Factory trap behind it, applies to your own health checks too.

2026-09-21 aspnet-core dotnet-10 logging

How to add the current user id to every log entry in ASP.NET Core

A BeginScope middleware misses the exception handler's error log and the Request finished line. Register an ILogEnricher that reads the user from IHttpContextAccessor, open a scope only when work leaves the request, and watch out for Serilog's AddSerilog silently cancelling enrichment.

2026-09-21 ef-core ef-core-10 postgresql

How to atomically append to a PostgreSQL jsonb array with EF Core and Npgsql

Loading an entity, calling List.Add, and saving rewrites the whole jsonb document and silently loses concurrent appends. Push the append into one UPDATE with the jsonb || operator, either through ExecuteSqlAsync or a mapped function inside ExecuteUpdateAsync, and make it idempotent with a @> guard.

2026-09-21 ef-core ef-core-10 oracle

How to use an Oracle sequence to generate primary keys in EF Core

Map an EF Core key to an Oracle sequence with UseSequence in Oracle.EntityFrameworkCore 10: the DDL and INSERT SQL the provider really emits, how to point at an existing sequence or a legacy trigger, why quoting and HiLo trip people up, and how to move an identity column onto a sequence without ORA-00001.

2026-09-21 migration mcp oauth

Migrate a stdio MCP Server to a Remote OAuth-Protected HTTP Server (MCP 2026-07-28: CIMD First, DCR as Fallback)

Move a local stdio MCP server to a remote Streamable HTTP server behind OAuth on MCP spec 2026-07-28 and TypeScript SDK 2.0.0. Dynamic Client Registration is now deprecated, so use Client ID Metadata Documents first and keep DCR only as a fallback. Covers the steps, a measured CIMD/DCR test matrix, and the misleading error you get when the two sides disagree.

Page 1 of 91 Next ›