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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.

2026-09-29 blazor dotnet-11 aspnet-core

Blazor Gets Agentic UI Components in .NET 11 RC1: ChatPage, UIAgent, and Tool Approvals

Microsoft.AspNetCore.Components.AI is an experimental Blazor package in .NET 11 RC1 that turns any IChatClient into a streaming chat UI with tool approvals, typed tool rendering, and shared state over AG-UI.

2026-09-29 errors dotnet dotnet-10

Fix: Android status bar icons become unreadable after enabling UseMaterial3 in .NET MAUI 10

MAUI 10.0.100 picks status bar icon colors from colorPrimary, which is the opposite brightness of the Material 3 surface, so you get white on white or black on black. Update Microsoft.Maui.Controls to 10.0.101 or later, or reset AppearanceLightStatusBars in MainActivity.

2026-09-29 errors efcore dotnet

Fix: EF Core `Contains` on a static readonly `IList<T>` or `ISet<T>` could not be translated

EF Core 8, 9 and 10 fail to translate Contains when the list is a static readonly field typed as IList, ICollection, ISet or IReadOnlySet. Call Enumerable.Contains explicitly, or upgrade to EF Core 11.

2026-09-29 ai-agents claude-code playwright

Self-Healing E2E Tests When a Coding Agent Renames Your Selectors

A coding agent refactors a component, renames a data-testid, and your Playwright suite goes red. Here is a three-layer setup, verified on Playwright 1.63.0 and Claude Code 2.1.197: locators that survive, a PreToolUse hook that blocks the rename, and a CI guard that lets the Playwright healer agent fix locators but never rewrite an assertion.

2026-09-28 errors dotnet dotnet-10

Fix: .NET MAUI Entry with Keyboard.Numeric shows a small numpad, then the full keyboard, on iPadOS 26

On iPadOS 26, MAUI maps Keyboard.Numeric to UIKeyboardType.DecimalPad, which now opens as a floating mini numpad. Append a mapper that switches iPad to NumbersAndPunctuation and filter input yourself.

2026-09-28 errors dotnet dotnet-10

Fix: MAUIR0001 MissingMethodException in .NET MAUI Resizetizer on an SVG with <filter> or <text>

MAUI 10.0.101 and 10.0.110 Resizetizer ship mismatched System.Memory references, so SVGs with filters or text fail. Pin Resizetizer 10.0.100 or strip the filter and text.

2026-09-28 llm ai-agents mcp

How to Measure an Agent's Fixed Token Overhead Before the First User Token

Every agent request pays for its system prompt, the provider's hidden tool-use preamble, and every tool schema before the user says anything. How to measure that fixed cost with differential count_tokens calls on the Anthropic API, the input_tokens endpoint on OpenAI, an MCP listTools probe, and /context in Claude Code, anchored to claude-opus-5-5, claude-sonnet-5, and @modelcontextprotocol/client 2.1.0.

2026-09-28 quartz-net dotnet csharp

Quartz.NET 4.2 Turns Bad Cron Expressions into Build Errors

Quartz.NET 4.2.0 ships a Roslyn analyzer that rejects unparseable cron literals as QZ0001 at compile time, plus a source generator that turns [QuartzJob] and [CronTrigger] attributes into an AddDeclaredJobs() registration. Here is what it checks, what the generated code looks like, and how to opt out.

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.

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