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

2026-10-11 csharp dotnet

How to tail a log file in C# while another process is still writing to it

Open the log with FileShare.ReadWrite | FileShare.Delete, seek to the end, poll for new bytes, decode them with your own UTF-8 Decoder instead of StreamReader, and handle truncation and rotation explicitly. A tested tail -F implementation for .NET 10 and .NET 11.

2026-10-26 dotnet csharp

How to use a different Serilog output template per log level from appsettings.json

outputTemplate is fixed per sink, so per-level formatting needs either an ExpressionTemplate with {#if @l ...} blocks or two Logger sub-loggers with ByIncludingOnly / ByExcluding filters. Both configured purely from appsettings.json, tested on Serilog 4.4, Serilog.Settings.Configuration 10.0.1 and Serilog.Expressions 5.0.

2026-10-04 dotnet dotnet-10

How to detect Windows session lock, unlock, logon and logoff events in a C# app

Use SystemEvents.SessionSwitch in a desktop or console app, override OnSessionChange in a Windows service, or hook WM_WTSSESSION_CHANGE yourself. Covers .NET 10 code for all three, the hidden '.NET System Events' thread, why services see logon but desktop apps do not, out-of-order notifications, and how to query the current lock state with WTSQuerySessionInformation.

2026-11-13 errors csharp dotnet

Fix: coverlet reports an uncovered branch on the closing brace of an async IAsyncEnumerable<T> method

The branch is the compiler's null check on the [EnumeratorCancellation] linked token source. coverlet before 10.0.0 misses it in generic iterators: upgrade.

2026-11-13 errors nuget dotnet

Fix: "Package 'X' is incompatible with 'all' frameworks in project" on dotnet add package

The message is a catch-all: dotnet add package prints it for any failed restore. Scroll up to the NU1101, NU1102, NU1202 or NU1301 line, and drop --source, which hides every other feed.

2026-11-13 cursor ai-agents cursor-agent-sdk

How to Scaffold, Eval and Replay a Cursor Agent SDK PR Bot

Use agent-sdk init, agent-sdk eval and agent-sdk github replay (@grok/agent-sdk 0.6.0) to build a pull request review bot, pin its behavior with evals, and test it against real PRs without pushing a commit.

2026-11-13 dotnet security aspnetcore

November 2026 .NET patch: two CVEs a runtime update does not fix

The November 10, 2026 servicing release (.NET 10.0.15, 9.0.23, 8.0.34) patches 25 CVEs. Two of them, the Identity scaffolding email bug and the System.Formats.Cbor hash flood, need package bumps and code changes, not just a new runtime.

2026-11-12 errors csharp dotnet

Fix: CS0277 'does not implement interface member Offset.set. Offset.set is not public' with a protected setter

A class can only implicitly implement an interface accessor with a public accessor. Declare the interface property get-only and put the protected setter on the class, or implement the property explicitly.

2026-11-12 errors dotnet dotnet-cli

Fix: solution folders missing when a dotnet new template generates a .slnx solution

In .slnx a solution folder is a path: Folder Name must start and end with '/', so write Name="/source/", not Name="source". Nest Project inside Folder; a SolutionFolder attribute is silently ignored. Verified with dotnet new on SDK 10.0.302 and 11.0.100.

2026-11-12 errors csharp dotnet

Fix: UnsafeAccessor field write has no effect on a struct

Declare the struct target as ref in the UnsafeAccessor signature and pass the real storage location, not a copy. A by-value target throws BadImageFormatException on .NET 8 to 11.

2026-11-12 flutter dart webassembly

Flutter 3.50 Opens WebAssembly to Safari and Firefox and Adds --web-content-hash

Flutter 3.50 and Dart 3.14 shipped on November 11, 2026. On the web, Safari 26.2+ and Firefox 147+ can now run the Wasm build behind an opt-in wasmAllowList, and flutter build web gets built-in content hashing for long-lived caching.

2026-11-12 ai-agents llm agent-skills

How to Manage Claude Managed Agents, Skills and Memory Stores as Code with ant apply

Keep Claude Managed Agents, skills, environments and memory stores in git and reconcile them with `ant apply` (anthropic-cli 1.30.0+, current 2.9.0). The file layout for each kind, what claude-lock.json records and why you must commit it, how drift, --force and --prune behave, why memory stores attach through deployments rather than agents, and a GitHub Actions workflow that applies on merge.

2026-11-11 dotnet dotnet-11 csharp-15

.NET 11 Is Generally Available: What to Change in Your Project Today

.NET 11.0.0 and SDK 11.0.100 shipped on November 10, 2026 as an STS release supported until November 14, 2028. The retarget steps, what C# 15 turns on by default, what is still preview, and the CPU baseline check to do first.

Page 1 of 115 Next ›

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

Featured

How to tail a log file in C# while another process is still writing to it

How to use a different Serilog output template per log level from appsettings.json

How to detect Windows session lock, unlock, logon and logoff events in a C# app

Latest

Fix: coverlet reports an uncovered branch on the closing brace of an async IAsyncEnumerable<T> method

Fix: "Package 'X' is incompatible with 'all' frameworks in project" on dotnet add package

How to Scaffold, Eval and Replay a Cursor Agent SDK PR Bot

November 2026 .NET patch: two CVEs a runtime update does not fix

Fix: CS0277 'does not implement interface member Offset.set. Offset.set is not public' with a protected setter

Fix: solution folders missing when a dotnet new template generates a .slnx solution

Fix: UnsafeAccessor field write has no effect on a struct

Flutter 3.50 Opens WebAssembly to Safari and Firefox and Adds --web-content-hash

How to Manage Claude Managed Agents, Skills and Memory Stores as Code with ant apply

.NET 11 Is Generally Available: What to Change in Your Project Today