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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.

2026-05-13 dotnet-11 maui dotnet-watch

dotnet watch finally reaches MAUI on Android and iOS in .NET 11 Preview 4

.NET 11 Preview 4 turns on dotnet watch for Android devices, Android emulators, and the iOS Simulator. Edit, save, and the running app updates without a manual rebuild. One csproj gotcha applies to iOS.

2026-05-13 errors csharp dotnet

Fix: System.Text.Json.JsonException: The JSON value could not be converted

System.Text.Json throws this when the incoming JSON token doesn't match the CLR target type. Match the JSON to the type, or register a JsonConverter or JsonSerializerOption that bridges them.

2026-05-13 claude-code ai-agents agent-skills

How to Structure a Monorepo So Claude Code's Context Stays Small

A 2026 playbook for keeping Claude Code's 200k token context lean in a monorepo: launch from the subtree you are touching, split CLAUDE.md into nested files that load on demand, push path-scoped rules into .claude/rules/, use skills and subagents for the noisy reads, and exclude other teams' files with claudeMdExcludes. Anchored to Claude Code 2.1.x, claude-sonnet-4-6, and claude-opus-4-7.

2026-05-12 cursor bugbot ai-agents

Cursor Bugbot Adds Default, High, and Custom Effort Levels

On May 11, 2026, Cursor shipped effort levels for Bugbot. Default finds 0.7 bugs per review, High pushes it to 0.95, and Custom lets you describe in plain English when each mode should kick in.

2026-05-12 errors csharp dotnet

Fix: System.IO.FileNotFoundException: Could not load file or assembly in a published app

Runs fine with dotnet run, throws after dotnet publish. The DLL is usually missing from the publish folder, not the runtime. Check deps.json, ProjectReference Private, and trimming.

2026-05-12 errors csharp dotnet

Fix: InvalidOperationException: Synchronous operations are disallowed

Replace the Stream.Read or Write call with ReadAsync/WriteAsync. As a last resort, set AllowSynchronousIO on Kestrel, IIS, or per-request via IHttpBodyControlFeature.

2026-05-12 errors csharp dotnet

Fix: RZ10012: Found markup element with unexpected name in Blazor

Blazor's Razor compiler emits RZ10012 when a PascalCase tag has no matching component type in scope. Add @using for the component's namespace in _Imports.razor, or @namespace in the component, then rebuild.

2026-05-12 llm ai-agents claude-code

How to Cache Multi-Turn Claude Conversations Across API Calls

Place rolling cache_control breakpoints across messages, respect the 20-block lookback, and refresh the 5-minute TTL automatically so a 50-turn agent loop pays the prefix once, not fifty times. Verified against anthropic 0.42 (Python) and @anthropic-ai/sdk 0.30 (Node) in May 2026.

2026-05-11 cursor ai-agents pull-requests

Cursor 3.3 Adds Build in Parallel, Split PRs, and a Unified PR Review

Cursor 3.3 (May 7, 2026) ships async subagents that work on independent steps of a plan at the same time, a quick action that splits one chat into multiple pull requests, and a redesigned PR workflow that keeps reviews, commits, and changes in one place.

2026-05-11 errors csharp dotnet

Fix: dotnet ef migrations add fails with 'Unable to create an object of type DbContext'

EF Core's design-time tools could not instantiate your DbContext. Either expose a host via WebApplication.CreateBuilder, point to the right startup project, or implement IDesignTimeDbContextFactory.

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