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

Claude Code 2.1.251 adds PreModelSwitch and PostModelSwitch hook events. The matcher fires on the canonical name of the model you are switching to, and exit code 2 cancels the switch.

A symlink swapped after the check, deny rules that stopped applying through a symlinked search path, a marketplace command pointing outside its plugin, and a workflow script read before approval. Four fixes in one release, all the same bug.

CA1070 fires on virtual field-like events. Drop the virtual, keep the event non-virtual, and let derived classes override a protected virtual OnXxx raiser instead.

The APK has no native library for the device's CPU. Since .NET 9 the default Android RuntimeIdentifiers are 64-bit only, so the fix is to set RuntimeIdentifiers explicitly. Covers ADB0020, XA0036, NETSDK1083, the ABI to RID mapping, the Play Console wording, and why the four-RID snippet everyone copies breaks on .NET 11.

BuildKit cannot read the manifest for your base image. Check the tag exists, repair the Docker credential helper, open both MCR endpoints, then pre-pull for offline builds.

A server that vanished from /mcp with no error is almost always an allowlist. Run claude mcp add on the same server: the add path prints the reason the load path swallows.

A thread shares memory with every other thread in the process. A Dart isolate does not: it owns its heap, runs one event loop, and talks to other isolates only by messages. Here is what that means at the VM level, where isolate groups blur the line, and how it plays out in Flutter, FFI, and on the web.

WithTerminal() gives a resource an interactive PTY session you can type into from the dashboard or attach to from your own shell. It is experimental, it detaches the debugger, and the Shell option you may have written against is gone.

MCP9005 is advisory, but MCP9004 crashes at startup and stateless mode makes SampleAsync throw. Here is what each diagnostic means and how to fix it properly.

Move every package version out of your csproj files into one Directory.Packages.props. Covers a generator script that reconciles conflicting versions with real semver ordering, the before/after dependency-graph diff that proves what moved, NU1008/NU1010/NU1013/NU1507, transitive pinning, GlobalPackageReference, VersionOverride, and why a nested Directory.Packages.props silently shadows the root one.