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.

2026-11-12 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 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 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 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.

2026-11-11 errors csharp csharp-14

Fix: CS8620 "Argument of type 'string' cannot be used for parameter ... due to differences in the nullability" on a params method in a C# 14 extension block

CS8620 on a params member inside a C# 14 extension block is a Roslyn bug in the .NET SDK 10.0.1xx band. Move to SDK 10.0.200+ or 11.0.100, or pass an array until you can.

2026-11-11 errors dotnet-10 dotnet-11

Fix: .NET 10 configuration binding silently drops records whose nullable constructor parameters are null

A JSON null now reaches the binder as a real null, and binder 10.0.x treats it as missing config for a constructor parameter. Upgrade the binder package to 11.0.0, or give the parameter a default value.

2026-11-11 flutter dart testing

How to call the real path_provider in a Flutter test instead of getting MissingPluginException

flutter test never runs the Dart plugin registrant, so getTemporaryDirectory() hits the MethodChannel default and throws MissingPluginException. On a macOS, Windows or Linux host you can register the host implementation (PathProviderFoundation 2.6.0+ is FFI, not a channel), use a temp-dir PathProviderPlatform fake, or run integration_test on desktop. Checked on Flutter 3.44.8 with path_provider 2.1.6.

2026-11-11 llm ai-agents anthropic-sdk

How to Trace Anthropic SDK Calls With the Built-In OpenTelemetry Export

The Anthropic Python and TypeScript SDKs now emit OpenTelemetry spans on their own: register a tracer provider before the first call and every messages.create becomes an anthropic.messages.create CLIENT span with gen_ai.* token, model and stop-reason attributes. Content mode, conversation IDs, user.id baggage, linking to the Claude Platform's server-side spans, streaming and tool runner behavior, and the env-var override trap, checked against anthropic 2.8.0.

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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: 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

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

Fix: UnsafeAccessor field write has no effect on a struct

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

Fix: CS8620 "Argument of type 'string' cannot be used for parameter ... due to differences in the nullability" on a params method in a C# 14 extension block

Fix: .NET 10 configuration binding silently drops records whose nullable constructor parameters are null

How to call the real path_provider in a Flutter test instead of getting MissingPluginException

How to Trace Anthropic SDK Calls With the Built-In OpenTelemetry Export