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

A widget asked for height: double.infinity inside a parent with no height limit, like a Column or ListView. Use Expanded, a finite height, LimitedBox, or SliverFillRemaining instead.

The manifest's .MainActivity resolves against the Gradle namespace, and no class with that name is in the APK. Make namespace, the Kotlin package line, and the manifest agree.

EF Core wraps a scalar SqlQuery<T> in a subquery and selects a column named Value as soon as you add First, Where, Max or Single. Alias your SQL column AS Value, or materialize first.

After you delete the Migrations folder and scaffold a new InitialCreate, EF Core does not know your tables exist. Drop a dev database, or record the new migration in __EFMigrationsHistory without running it.

MSTest.Sdk 4.5 and Microsoft.Testing.Platform 2.5 make the UWP or WinUI 3 app the test host itself. [UITestMethod] runs each test on the real dispatcher, packaged and AppContainer apps are activated by AUMID through a sidecar controller, and unpackaged WinUI finally works.

A context window is everything the model can see in one request: system prompt, tool definitions, history, tool results, thinking and the reply. Here is what counts, what happens at the limit on claude-opus-5-5 and friends, and the six techniques agents use to work past it: deferred tools, context editing, compaction, memory, subagents and output filtering.

Another Gradle process holds ~/.gradle/caches/journal-1 and cannot hand it over. Find the Owner PID, kill that daemon, and stop deleting .lock files: that only moves the error.

The official google_mobile_ads sample renders nothing until onAdLoaded, so your content jumps by 150 dp seconds after the screen appears. Ask for the anchored adaptive size first, reserve it with a SizedBox, persist the height across launches, and only then load the ad. Measured on Flutter 3.44.8 with google_mobile_ads 9.1.0.

Orleans 10.4.0 adds StreamSubscriptionStartPosition.EarliestAvailable, so a new stream subscriber can replay what is still in the pulling agent's queue cache. The release also changes RPC argument wire IDs, request-latency metrics, and SQLite persistence scripts.

Tool calling is a protocol, not magic: the model emits a structured request matching a JSON Schema you supplied, your code runs it, and the result goes back as a message. The schema and its descriptions are rendered into the model's prompt and, with strict mode, into a decoding grammar, so they shape behaviour more reliably than any system-prompt instruction. Here is how it works on claude-sonnet-5-5 and OpenAI strict mode, with schema patterns that make invalid calls impossible.