.NET news, Wednesday, October 21, 2026

.NET 11

Shell calls without deadlock

DVDEV Community: #csharp JKC Oct 21

.NET 11 Process.RunAndCaptureText avoids the classic stdout/stderr deadlock

.NET 11 RC2 adds Process.RunAndCaptureText, which runs an external command, drains stdout and stderr together and returns both strings with the exit code. It removes the deadlock that the classic redirect-and-ReadToEnd pattern can hit on noisy tools. Anyone who shells out to git, ffmpeg or internal CLIs will want to know the new helpers and their timeout behavior.

csharp performance runtime 6 min

MCP C# SDK 2.3

ServerInfo is now nullable

MCMCP C# SDK releases jeffhandley Oct 21

MCP C# SDK 2.3.0 released: ServerInfo is now nullable

MCP C# SDK 2.3.0 brings improvements to HTTP discovery, OAuth, stdio shutdown and the ordering of server tools, prompts and resources. It also includes a source-compatibility change: McpClient.ServerInfo is now nullable. Projects that read this property may see new nullable warnings or fail warnings-as-errors builds.

ai breaking-change csharp 3 min

Aspire 13.6.2

MessagePack security patch

ASmicrosoft/aspire releases aspire-repo-bot[bot] Oct 21

Aspire 13.6.2 released with MessagePack pinned for security fixes

Microsoft has released Aspire 13.6.2, a patch on the 13.6 line. The main change pins the MessagePack dependency to 2.5.307 to pick up security fixes. Because the release is maintenance-focused, it is a low-effort upgrade for Aspire developers, but the dependency pin is worth checking in your own projects.

aspire security 1 min

Unity

Native plugin threading

DVDEV Community: #csharp Nabeel Hassan Oct 21

Unity native plugin bugs: threading, not the calls

A practical guide to Unity native plugins on Android and iOS, arguing that the hard part is not the native calls but threading, build configuration and release stripping. It covers a single C# interface with an editor fake, marshalling callbacks to the main thread, and CI checks for both platforms.

csharp mobile unity 8 min

SQLite, EF Core 10

Same file back out

DVDEV Community: #dotnet Son Tran Oct 20

Round-tripping SQLite schemas: what a diagram lost and what was fixed

Schemity, a desktop ERD tool, read two real SQLite schemas, Campfire on Rails 8 and Jellyfin on EF Core 10, and rebuilt database files from the SQL it wrote. Before the fixes, declared column types, partial and expression indexes and AUTOINCREMENT settings were lost. The post is a useful case study for anyone who edits or migrates SQLite schemas with a tool.

efcore sqlite tooling 15 min

.NET 10

Compact binary data

ALAndrew Lock | .NET Escapades Andrew Lock Oct 20

CBOR in .NET with System.Formats.Cbor: an introduction

Andrew Lock introduces CBOR, a binary serialization format positioned as a more compact alternative to JSON, and shows how to use the System.Formats.Cbor package. The post walks through writing and reading CBOR with CborWriter and CborReader and explains the conformance modes that control the output.

csharp performance runtime 15 min

ASP.NET Core

Skip cancelled request logs

HBHabr C# (ru) alexeysp11 Oct 20

Suppressing logs for cancelled HTTP requests with Scrutor

A Habr author describes how their ASP.NET Core team stopped logging OperationCanceledException when a client aborts an HTTP request. NLog filters and middleware catches fell short. The working approach decorates ILoggerProvider with Scrutor and checks HttpContext.RequestAborted before writing the entry.

architecture aspnetcore logging 14 min

C# 15

Closed class hierarchies

NPNimblePros Blog Oct 20

Closed hierarchies in C# 15: exhaustive pattern matching for class types

C# 15 adds the closed modifier, which limits derived types of a base class to the same assembly. The compiler then knows the full list of subtypes and can flag switch expressions that miss a case. This helps .NET developers catch new cases at build time instead of finding silent runtime bugs in game logic or domain rules.

architecture csharp performance 12 min

ASP.NET Core 10

Limit requests per client

ADAnton DevTips Anton Martyniuk Oct 20

Rate Limiting in ASP.NET Core: Four Algorithms Compared

A guide to the four built-in rate limiting algorithms in ASP.NET Core: fixed window, sliding window, token bucket and concurrency limiter. It shows how each one behaves under the same traffic and when to pick it for a given endpoint. Useful for any .NET developer who needs to protect an API from abusive or buggy clients.

aspnetcore performance security 18 min

NET 10 JSON

Read JSON from a pipe

ELelmah.io Blog Ali Hamza Ansari Oct 20

Reading large JSON with PipeReader in .NET 10 System.Text.Json

Ali Hamza Ansari compares the PipeReader overload that .NET 10 adds to System.Text.Json with reading the same large JSON payload from a Stream. He measures execution time, allocated memory and GC collection counts on a file with one million records. The results matter if your high-traffic endpoints deserialize big request bodies.

aspnetcore csharp performance 6 min

Bobcat

Trustworthy test automation

JXJasperFx (Critter Stack) Blog Jeremy Miller Oct 20

Succeeding with test automation using Bobcat

The Critter Stack team has described the test automation strategy behind Bobcat, its new spec-driven integration testing framework for .NET. The post, written by Jeremy Miller, lays out practices for tests that ship confidence, are cheap to write, run fast, stay reliable and explain their failures. It is a useful reference for .NET teams who want their CI results to be trusted as a merge gate.

ci testing tooling 28 min

SharpLsp 0.30

C# in .razor files

SLSharpLSP Blog SharpLsp Team Oct 20

SharpLsp adds Razor support: C# tooling inside .razor and .cshtml files

SharpLsp 0.30 adds Razor support to its VS Code C# extension. Blazor .razor components and Razor Pages or MVC .cshtml views now get Roslyn hover, completion, diagnostics, go to definition, references and rename. For Blazor work in VS Code, this closes much of the editing gap with Visual Studio.

aspnetcore blazor tooling 7 min 1

OrmLite v10.4

Typed complex queries

SSServiceStack Blog [email protected] (Demis) Oct 20

OrmLite v10.4 adds typed recursive, window and combined queries

ServiceStack v10.4 brings typed support to OrmLite for recursive hierarchies, named sub queries, window functions, set operations and keyset paging. These queries used to need hand-written SQL, and now they stay parameterized and composable with your existing filters and joins. The post walks through each feature with examples and the SQL they generate.

csharp efcore performance 11 min

ASP.NET Core 11

Validation messages translated

KAKhalid Abuhakmeh Khalid Abuhakmeh Oct 20

Localize Minimal API validation messages in .NET 11

ASP.NET Core 11 adds built-in localization for validation messages and display names in Minimal APIs and Blazor. Registering AddValidation and AddLocalization, plus culture-specific resx files, is enough to return 400 responses in the caller's language. The author shows a working sample and an integration test across four cultures.

aspnetcore csharp minimal-api 7 min

SDK Containers

Images without Dockerfile

BABenjamin Abt BEN ABT Oct 20

Containerizing .NET in 2026 Without a Dockerfile

Benjamin Abt explains how the .NET SDK's PublishContainer target can build an OCI image for ASP.NET Core services without a Dockerfile and deliver it to a registry, an archive or a local runtime. The article offers a practical rule for when SDK publishing fits and when a Dockerfile still makes sense.

aspnetcore cloud tooling 10 min

Wednesday, October 21, 2026
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