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

On October 29, 2026 Microsoft announced Syncfusion as a Blazor contributor. The headline is Syncfusion.Blazor.Toolkit 2.0.1: 17 MIT-licensed components for net8.0, net9.0 and net10.0, free for commercial use with no license key. Here is what is in it, how to wire it up, and where the commercial line is drawn.

Claude Tag is Anthropic's shared Slack agent: one org-owned identity per channel scope, with channel memory, admin-granted connectors, a GitHub App for draft PRs, and a monthly spend limit. Here is what it is, how setup and pairing work, how it differs from the old Claude in Slack and Claude Code in Slack apps, and the data-retention and billing details to check before you turn it on.

[ModuleInitializer] makes the C# compiler emit a <Module> static constructor that calls your method once per assembly. When it runs is looser than most people think: on the JIT it can fire before a branch that never executes, under Native AOT it runs eagerly at startup or not at all. Why CA2255 warns libraries off it, the few cases where a library should still use it, and measured behaviour on .NET 10.

pubspec_overrides.yaml is a file next to pubspec.yaml that pub reads on top of it, limited to dependency_overrides, resolution and workspace. It replaces the whole dependency_overrides section, applies workspace-wide, and is left out of published archives. What it does, when to use it in a monorepo, and every edge case, verified on Dart 3.12.2.

Microsoft Agent Framework for .NET 1.27.0 makes DefaultHttpRequestHandler throw HttpRequestException when its client-provider callback returns a client for a redirect destination. Here is why that hole existed, what breaks, and how to rewrite the callback.

A coding agent loses its context every session, so a project that runs for days needs its memory in the repository. Make the coordinator a small script and a JSON ledger, run every worker as a fresh `claude -p` session in its own git worktree with a hard scope and budget, and have the coordinator verify and merge the work itself. Tested with a stub worker; flags pinned to Claude Code 2.1.310.

Replace the deprecated textScaleFactor on MediaQueryData, Text, RichText and TextPainter with TextScaler. What dart fix rewrites (3 of 9 call sites in our sample), why its output can quietly undo Android 14 nonlinear font scaling, how to cap text size with clamp and withClampedTextScaling, and the equality and test gotchas. Measured on Flutter 3.44.8 with Dart 3.12.2.

FileShare is what you let other handles do while yours is open, and Windows checks it in both directions against every open handle's FileAccess. Linux and macOS only emulate it with an advisory flock, so 56 of 144 open combinations behave differently. The rule, the defaults of every File.* helper, and measured results on .NET 10.

After SaveChangesAsync, EF Core 11 copies store-generated keys, defaults, computed columns and concurrency tokens back into your entities, fixes up foreign keys and navigations, and resets every entry to Unchanged. Here is exactly what gets written, when, what the SQL looks like, and four cases where the value on your entity is not what is in the database.

A tested migration from FluentAssertions 8.11 to AwesomeAssertions 9.6 on .NET 10: the two-hop path through AwesomeAssertions 8.2, the License.Accepted compile error, the namespace rename, companion packages, and the silent DLL clash that can put the Xceed-licensed assembly back in your test run.