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374 posts · Page 4 of 38

2026-10-13 errors dotnet dotnet-10

Fix: FileInfo.Length returns a stale size for a file that is still being written on Windows

FileInfo caches its size, enumeration reads NTFS's lazily updated directory entry, and the writer may still hold bytes in its own buffers. Refresh(), or better, read the length from a shared handle with RandomAccess.GetLength.

2026-10-12 fluentvalidation native-aot dotnet

FluentValidation 12.2 fixes IsInEnum() crashing native AOT apps on [Flags] enums

FluentValidation 12.2.0, released October 10, 2026, swaps Enum.GetValues for Enum.GetValuesAsUnderlyingType inside EnumValidator, so IsInEnum() on a [Flags] enum no longer throws NotSupportedException in a native AOT binary.

2026-10-12 csharp dotnet-10 console

How to discard buffered keypresses before Console.ReadKey in a C# console game loop

Drain the console input buffer with while (Console.KeyAvailable) Console.ReadKey(true) before you wait for a fresh key, and drain it every frame in a game loop so key repeat cannot pile up. How the buffer works on Windows and Unix in .NET 10, why held keys lag, the Unix echo trap, and FlushConsoleInputBuffer.

2026-10-11 ef-core dotnet-10 csharp

How to check whether an entity is already tracked by the DbContext before attaching it in EF Core

Use DbSet.Local.FindEntry(key) to ask the change tracker whether an entity with a given key is tracked, without a database round trip or a scan. Why Entry(entity).State lies for this question, why Find queries, and a tested AttachOrMerge helper for EF Core 10.

2026-10-11 csharp dotnet file-io

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.

2026-10-11 quartz-net dotnet csharp

Quartz.NET 4.4: Jobs Report What They Achieved, and a Health Check Notices When They Stop

Quartz.NET 4.4.0 lets a job set context.Result to a JobRunReport (Succeeded, Failed, Cancelled or Skipped, with a summary and metrics), keeps that per job in the execution history, and adds RequireSuccessWithin health checks that degrade when a nightly job stops succeeding.

2026-10-10 dotnet dotnet-11 csharp

How to Match Nested Parentheses and Balanced Tags with Balancing Groups in .NET Regex

Balancing groups (?<name>) and (?<-name>) turn a .NET regex capture group into a stack, so one pattern can match arbitrarily nested parentheses or <div> tags. The full pattern, how the stack works, inner-content capture with (?<inner-open>), and the gotchas verified on .NET 11 RC1: the empty-stack check, catastrophic backtracking, NonBacktracking, and mixed bracket types.

2026-10-10 dotnet-11 csharp interop

What Is Transparent Struct Layout, and Why Does a Single-Field Wrapper Struct Change the Calling Convention in .NET?

A transparent struct is one the ABI treats exactly like its only field. .NET 11 has no such guarantee: a struct wrapping a double is passed in RCX on Windows x64 but in XMM0 on Linux and macOS. Here is the disassembly from the .NET 11 JIT on three ABIs, the P/Invoke bugs it causes, and how to write wrapper types that are safe at every boundary.

2026-10-09 dotnet semantic-kernel ai-agents

Semantic Kernel 1.81 Stops FileIOPlugin From Leaking Files Outside AllowedFolders

Semantic Kernel .NET 1.81.0 fixes a FileIOPlugin oracle: WriteAsync told the model a file outside AllowedFolders existed, was read-only, and where it lived. Measured before and after.

2026-10-07 vs-code csharp dotnet-11

C# Dev Kit 11.0 Collapses Six Processes Into One Native AOT Binary

C# Dev Kit 11.0 pre-release replaces six managed processes with a single Native AOT CSDevKit process and a persistent project cache. A 407-project Aspire solution is ready in 3.0s instead of 84.1s, using 316 MB instead of 2,072 MB.