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

Microsoft Agent Framework .NET 1.23.0 honors assignments to FunctionInvocationContext.Function, so middleware can redirect a tool call to a different AIFunction. A new WrapWithPendingMiddleware helper keeps the rest of the chain in the loop.

EF.Constant inlines a captured value as a SQL literal, EF.Parameter turns a literal into a SQL parameter. Keep EF Core's defaults, use EF.Parameter to stop dynamically built expression trees from recompiling on every call, and use EF.Constant only for a value with a handful of distinct values whose data is skewed enough to need its own plan.

material_ui 1.3.0 and cupertino_ui 1.1.0 use an annotation Flutter 3.44 does not export. Both are retracted, but a lockfile keeps them. Downgrade, then upgrade, to land on 1.2.0 and 1.0.2.

Volatile.Read is an acquire load of one location. Volatile.ReadBarrier, new in .NET 10, is a fence that gives every earlier read acquire semantics. Use Volatile.Read for flags and published references, and ReadBarrier when you need a batch of plain or non-atomic reads to complete before the next memory access, as in a seqlock.

An agent skill is a folder with a SKILL.md file that the agent loads on demand: only its name and description sit in the system prompt, the instructions arrive when a task matches, and bundled scripts run without ever entering context. Here is how that differs from a system prompt in cost, scope, invocation and trust, with the exact limits from the Agent Skills spec and Claude Code.

Switch on the union value, not .Value, and use a switch expression or add case null to a switch statement. Statements need null coverage that expressions only warn about.

Exit code 5 means MTP rejected a command-line option, not that tests are missing. Run the test exe directly to see the real error, then add the extension package or route the option per project.

MAUI 10.0.110 ships six leak fixes for BackButtonBehavior, SwipeItemView, ListView.RefreshCommand, IndicatorView, GeometryGroup and TableView. Most were filed and patched by gh-aw workflows, and they matter most if you use RelayCommand from CommunityToolkit.Mvvm.

Aspire 13.6.0 makes the dashboard persistent: resource snapshots and telemetry go into a SQLite database, the AppHost keeps up to ten runs per application, and completed runs stay browsable read-only. Here is how the Run, Resume, and None modes work and how to configure the standalone dashboard.

Dart 3.13 removed the VM's built-in fallback root certificates. Put a CA bundle in the runtime image: COPY /runtime/ from dart:stable or install ca-certificates.