Start Debugging

Tag: csharp

346 posts · Page 2 of 35

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 vscode 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.

2026-10-04 dotnet dotnet-10 csharp

How to add a strong-named assembly's full public key to InternalsVisibleTo in an SDK-style project

A signed assembly must name its friend by the full 320-character public key, not the token, or the build fails with CS1726 or CS0281. Get the key with sn -p and sn -tp, or with a cross-platform .NET script, then put it in the Key metadata of an InternalsVisibleTo item in the .csproj. Covers the PublicKey property fallback, Moq's DynamicProxyGenAssembly2 key, and the line-break trap.

2026-10-04 dotnet dotnet-10 csharp

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.

2026-10-04 nunit testing dotnet

NUnit 5: Assert.ThrowsAsync Now Returns a Task, and an Unawaited One Passes Silently

NUnit 5.0.0 makes Assert.ThrowsAsync, CatchAsync and DoesNotThrowAsync truly asynchronous. Forget the await and the assertion never runs. Here is what breaks, what the NUnit.Analyzers NUnit2059 rule catches, and the other NUnit 5 changes to check before upgrading.

2026-10-03 csharp dotnet async

How to wait for a ValueTask synchronously in a non-async method without allocating

Check IsCompleted first and read the result through GetAwaiter().GetResult(), which costs 0 bytes. Only fall back to blocking when the ValueTask is still pending, and do that with a cached event and UnsafeOnCompleted instead of AsTask(), which allocates 72 to 208 bytes per call. Measured on .NET 10 and .NET 11 RC1.

2026-10-02 comparison csharp dotnet

Volatile.Read vs Volatile.ReadBarrier in .NET 10

Volatile.Read is an acquire load of one location. Volatile.ReadBarrier, new in .NET 10, is a fence that gives every earlier read acquire semantics. Use Volatile.Read for flags and published references, and ReadBarrier when you need a batch of plain or non-atomic reads to complete before the next memory access, as in a seqlock.

2026-10-01 errors csharp csharp-15

Fix: CS8509 or CS0161 on a switch that is exhaustive over a C# 15 union type

Switch on the union value, not .Value, and use a switch expression or add case null to a switch statement. Statements need null coverage that expressions only warn about.

2026-09-29 errors dotnet dotnet-10

Fix: Android status bar icons become unreadable after enabling UseMaterial3 in .NET MAUI 10

MAUI 10.0.100 picks status bar icon colors from colorPrimary, which is the opposite brightness of the Material 3 surface, so you get white on white or black on black. Update Microsoft.Maui.Controls to 10.0.101 or later, or reset AppearanceLightStatusBars in MainActivity.

2026-09-28 errors dotnet dotnet-10

Fix: .NET MAUI Entry with Keyboard.Numeric shows a small numpad, then the full keyboard, on iPadOS 26

On iPadOS 26, MAUI maps Keyboard.Numeric to UIKeyboardType.DecimalPad, which now opens as a floating mini numpad. Append a mapper that switches iPad to NumbersAndPunctuation and filter input yourself.