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

Polly.Core 8.8.1 starts the circuit breaker's background loop under ExecutionContext.SuppressFlow, so a long-lived pipeline stops pinning the AsyncLocal values of whoever built it. A 15-line repro shows the leak on 8.8.0 and the fix on 8.8.1.

Use /fleet for a one-off parallel task in your terminal, a dynamic workflow when the same multi-agent process has to run the same way twice, and GitHub Agentic Workflows when that process runs unattended on repository events. Compared on Copilot CLI 1.0.103 and gh-aw v0.93.6: who plans the split, limits, resume, permissions, write safety and billing.

The October 25, 2026 out-of-band release (.NET 8.0.33, 9.0.22, 10.0.14, 11 RC3) fixes a Brotli buffer overflow, a Linux tarball ownership flaw, and two CVEs the October 13 patches did not fully close.

Pass --output-dir once per DbContext and EF Core keeps every later migration in that folder and namespace. Why the default layout is lopsided, the CS0111 collision you get from a shared folder, how to move existing migrations, and when to split the history table.

outputTemplate is fixed per sink, so per-level formatting needs either an ExpressionTemplate with {#if @l ...} blocks or two Logger sub-loggers with ByIncludingOnly / ByExcluding filters. Both configured purely from appsettings.json, tested on Serilog 4.4, Serilog.Settings.Configuration 10.0.1 and Serilog.Expressions 5.0.

Aspire 13.6.4 stops a single timed-out or HTTP 504 DCP create call from sending a resource to FailedToStart, and exposes three DcpPublisher timeouts you can raise on slow CI runners.

A plugin hook fails with "Failed to run: Plugin directory does not exist" when the directory your session loaded the plugin from is gone: an update past the 14-day orphan window, a claude.ai sync that moved the folder to .trash, or a --plugin-dir you moved. Run /reload-plugins, read its summary line, and know which cases need a restart. Checked against Claude Code 2.1.310.

Lock one Flutter route to landscape or portrait with SystemChrome.setPreferredOrientations without breaking the rest of the app: a stack-based lock that survives pushReplacement and restores on pop, why the empty list is the wrong reset, why iPad multitasking and Android 16 large screens ignore the lock, and what UIRequiresFullScreen means after iPadOS 26 and the iOS 27 SDK. Tested on Flutter 3.47.8 with Dart 3.13.7 and Xcode 27.1.

Calling remove inside a for-in loop or forEach throws ConcurrentModificationError. Use removeWhere for in-place filtering, build a new list with where or a collection-for, or loop backwards by index. Verified on Dart 3.13.7, with a benchmark of why removeAt in a loop is the slow option.

Put a discriminator field in the JSON, switch on it in a factory on the sealed base, and switch on the subtype to write it back. Three working versions on Dart 3.13.7: hand-written pattern matching, json_serializable 6.15.2, and Freezed 4.0.3 with unionKey and fallbackUnion, plus the gotchas each one hides.