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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.

2026-09-24 errors aspnet-core blazor

Fix: Conflicting assets with the same target path after upgrading to the .NET 10 SDK

On the .NET 10 SDK every Microsoft.NET.Sdk.Web project gets StaticWebAssetBasePath=/, so a web app referencing another web app collides. Set the base path on the referenced project. Disabling compression does not help.

2026-09-24 errors dotnet dotnet-10

Fix: HttpIOException: The response ended prematurely from HttpClient in .NET

HttpClient reuses a keep-alive connection the server just closed, or the server drops the connection mid-response. Lower PooledConnectionIdleTimeout below the server's idle timeout and retry only idempotent requests.

2026-09-24 errors blazor aspnetcore

Fix: Unable to find the required 'IAuthenticationService' service with [Authorize(Policy = ...)] in Blazor

A Blazor Web App page with [Authorize] becomes an endpoint the AuthorizationMiddleware checks, and a failed check calls ChallengeAsync, which needs AddAuthentication. Register a real scheme, or pass component endpoints through to AuthorizeRouteView.

2026-09-24 nuget dotnet security

Microsoft Is Rotating Its NuGet Author-Signing Certificate: Fix trustedSigners Before NU3034 Hits

Starting September 23, 2026, Microsoft packages on NuGet get author-signed with a new certificate (SHA-256 9A1B131B...). If your nuget.config pins Microsoft in trustedSigners, restores will fail with NU3034. Here is the fix, including the correct dotnet nuget trust command.

2026-09-24 migration cursor ai-agents

Migrate a Cursor Cloud Agent Workflow off GitHub to Cursor Origin (Early Beta, September 2026)

Move a repo, its Cursor cloud agents, automations, Bugbot, and CI from GitHub to Cursor Origin without a flag day: mirror first, rewire agents and CI while GitHub is still the source of truth, then cut over with Detach from GitHub or the reversible inbound_to_outbound mirror transition. Covers what breaks, the Origin CLI and API calls, a ref-parity check, and the rollback path.

2026-09-23 dotnet-10 httpclient resilience

Fix: custom DelegatingHandler does not run again on each retry with AddStandardResilienceHandler

A DelegatingHandler registered before AddStandardResilienceHandler runs once per logical request, not once per retry. Move it after the resilience handler, and make it idempotent, because the retry re-sends the same HttpRequestMessage. Measured on Microsoft.Extensions.Http.Resilience 10.10.0 and 8.10.0.

2026-09-23 dotnet-10 dotnet-11 configuration

Fix: IConfiguration.Bind does not populate an array or List<T> property from appsettings.json

The binder silently skips array properties without a public setter, get-only IReadOnlyList<T>, fields and init-only members under the source generator, and it appends to defaults instead of replacing them. Measured on .NET 10.0.12 and 11 RC 1.

2026-09-23 system-text-json csharp dotnet-10

How to serialize public fields like Vector3 and Quaternion with System.Text.Json

System.Text.Json writes Vector3 as {} and Quaternion as {"IsIdentity":false} because they store data in public fields. Here is how IncludeFields, a custom converter, a resolver modifier and source generation fix it, measured on .NET 10 and .NET 11 RC 1.

2026-09-23 migration agents-md ai-agents

Migrate .cursorrules, CLAUDE.md, and copilot-instructions.md to One AGENTS.md (Claude Code 2.1.277+)

Claude Code 2.1.277 reads AGENTS.md natively, so Cursor, Claude Code, and most Copilot surfaces can now share one instructions file. Here is the checklist for merging three drifted rule files into AGENTS.md, which bridge files to delete, the one Copilot file you still have to generate, and a CI check that keeps them from drifting again.

2026-09-23 redis stackexchange-redis dotnet

StackExchange.Redis 3.3 Moves Off a Redis Node Before the Server Drops You

StackExchange.Redis 3.3.0 adds opt-in maintenance notifications (smart client handoffs) for Redis Enterprise, Redis Cloud and Azure Managed Redis: relaxed timeouts during migrations, topology re-reads, and a proactive move before an endpoint goes away. Here is how to turn it on and the SER010 error you will hit first.

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