A method that returns IReadOnlyList<T> tells the caller it cannot write, but says nothing about whether the data is an independent copy, a live view or a fixed report. The article separates the declared capability from the ownership and lifetime contract, then evaluates each collection return shape against both layers.
A C# walkthrough of Gauss-Legendre quadrature that computes Legendre polynomial roots and weights at runtime instead of shipping precomputed tables. Bonnet's recurrence keeps the polynomial evaluation stable past degree 15, and Newton's method finds each root to about 1e-10 in a few iterations.
This article explains the difference between delegates and events in C#, the subscription boundary an event creates, and how multicast invocation behaves when a handler throws. It also covers what notification does not guarantee: completion of every subscriber, async handling and subscription lifetime. Read it to design event-based notifications with clearer contracts.
A Russian developer built Leaflet, a Windows Markdown notes app in C# on Avalonia 12 with AvaloniaEdit, without WebView or Electron. Notes stay as plain .md files with wiki-style links and backlinks, and the app starts in under a second. The write-up covers live preview, browser-free PDF export and the rough edges of window decorations, caret placement and file-conflict safety.
C# 15 lets you declare indexers inside extension blocks, so types you don't own can support square-bracket access. Adding Count and Slice also unlocks index-from-end, ranges, and list patterns. The feature was tested on the .NET 11 RC 1 SDK, and the article lists its gotchas: real indexers win silently, arrays and strings are excluded, and expression trees reject it.
Valve's Achievement Sets beta lets Steam games group achievements by base game, DLC and other sets. Steam refuses unlocks for DLC the account doesn't own or for archived sets, and one rejected item can fail an entire batch write. A C# developer maintaining an achievement manager explains the schema changes, the parsing code and the ownership-check fix.
Metalama 2027.0 introduces call-site interceptors that rewrite selected method calls at build time, so a method from a NuGet package or the .NET libraries can be wrapped without touching its source. The post walks through a retry example built from a T# template, a hand-written audit redirect, and the scoping rules. The feature is in preview from 2027.0.4-preview.
A new dotnetpro series walks through building a Game Boy emulator in C#. Part one covers the 16-bit address bus, the 64 KB memory map, CPU registers modeled as C# fields and properties, and the flag register. It also shows how opcodes are dispatched in a switch loop and how cycle counting keeps components in sync.
Khalid Abuhakmeh compares every practical way to loop through a List<T> in C#, from foreach and for to List.ForEach, Index() and spans, and benchmarks them on .NET 10 and .NET 11 RC 1. The post also covers safe removal during iteration and async loops. It is a useful reference for choosing the right loop in everyday and hot-path code.
Switching from a regular constructor to a primary constructor can change when fields get their values. The difference matters when a base constructor calls a virtual member. Steven Giesel shows the difference by looking at the code the compiler generates.
Željko Perić benchmarks his custom multi-column sort extensions for 2D and jagged arrays against the standard LINQ OrderBy/ThenBy pipeline using BenchmarkDotNet. The results show how memory layout and sorting algorithm change speed and allocations on datasets up to one million rows. It is a practical reference for developers who care about GC pressure in data-heavy code.
The new FullJoin method in .NET 11 returns matched pairs plus unmatched rows from both sides as (Outer, Inner) tuples. Join, LeftJoin, RightJoin and GroupJoin also gain overloads without a result selector. The feature is in .NET 11 RC2, so details may still change before the final release.