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

Microsoft.Extensions.Telemetry 10.11.0, released October 15, 2026, adds an experimental IncludeScopes option to global and per-request log buffering, so OrderId and TenantId from BeginScope survive a Flush() instead of being silently dropped.

Wire Cursor Rollouts (launched September 23, 2026) to your CI and to Datadog so every PR, including the ones a cloud agent wrote, gets a rollout plan before merge and per-environment checks at deploy, 20 minutes, 1 hour, 1 day and 3 days. Covers the DeploymentsService API, a GitHub Actions job, the Datadog MCP data source, and the gotchas that leave changes stuck in Pending.

The EF Core version of the SQL Server provider in your startup project decides it: EF Core 7 and earlier scaffold date as DateTime, EF Core 8 through 11 scaffold it as DateOnly. Here is the type mapping that makes the call, measured output from EF Core 7, 8, 10, and 11 RC 2, and the two ways to get DateTime back without silently remapping the column to datetime2.

A with expression calls the record's compiler-generated <Clone>$ method, which runs a copy constructor that copies every instance field and skips all initializers. That is why properties initialized from other properties, cached values, and Guid IDs come out stale. Measured on .NET 10 with C# 14, with the fixes that actually work.

dotnetup went to public preview on October 15, 2026. Run dotnetup sdk install in a repo and it reads global.json, maps rollForward to an update channel, and can even write newer patch versions back to the file.

A one-time, crash-safe import of existing Hive boxes into a drift SQLite database on the user's device: schema design, the import function, idempotency, deleting the boxes, and the two gotchas that silently corrupt data (DateTime precision and class-name collisions). Tested on Flutter 3.44.8 with hive_ce 2.22.0 and drift 2.35.2.

Upgrading a Blazor Web App whose pages live in a Razor class library or a .Client project from .NET 8 to .NET 10: what stays the same (both AdditionalAssemblies registrations), and the four things that break, from a 404 on blazor.web.js in thin hosts to NotFoundPage pages that render blank. Measured on ASP.NET Core 8.0.32 and 10.0.10.

A practical setup for Cursor Projects: prepare the repo so every worker starts warm, seed the Project's shared Context with a plan, conventions and a slice ledger, cut the work into disjoint PR-sized slices, and let subscriptions keep it moving. Covers Cursor 3.24, plan and admin gates, and the gotchas of a Context that lives outside git.

ref-safe-context is the scope in which a reference to a variable stays valid. Here are the four contexts, the rule that fixes a ref local's context at its initializer, why ref reassignment can never widen or narrow it, and the CS8157, CS8168, CS8374 and CS9079 errors that fall out of it, with compiler output from C# 14 on .NET 10 and .NET 11 RC1.

System.Formats.Cbor 11.0.0-rc.2 adds isFinalBlock, NeedsMoreData, and SlideData to CborReader, so you can decode CBOR straight off a stream without buffering the whole document. Verified on SDK 11.0.100-rc.2.