Start Debugging

Tag: dotnet

442 posts · Page 14 of 45

2026-08-02 csharp dotnet dotnet-11

How to replace new Regex(...) with the [GeneratedRegex] source generator in .NET 11

A complete guide to converting new Regex(pattern, RegexOptions.Compiled) into [GeneratedRegex] in .NET 11: the mechanical rewrite, partial methods vs partial properties, measured startup and throughput numbers, the SYSLIB1040-1045 diagnostics, and the two patterns where the generator silently falls back to a cached Regex.

2026-08-02 csharp dotnet dotnet-11

How to run CPU-bound work in a Blazor WebAssembly app with Web Workers in .NET 11

A complete guide to offloading CPU-bound work off the Blazor WebAssembly UI thread in .NET 11: why Task.Run does not help, the new blazorwebworker template, the WebWorkerClient API with cancellation and timeouts, the JSExport marshalling limits, and the second-runtime cost you pay per worker.

2026-08-02 visual-studio dotnet ai-agents

Visual Studio 18.8 Ships .NET Agent Skills Built In, Then Turns Them All Off

Visual Studio 2026 18.8 puts expert-authored .NET and Azure agent skills in the tool picker under a Built-in category, disabled by default. The default is the interesting part.

2026-08-01 dotnet ai-agents testing

The New .NET Unit-Test Agent's Best Idea Is Not Writing Tests

On 2026-07-31 Microsoft shipped a polyglot unit-test agent in dotnet/skills. The interesting part is the mandatory pre-completion gate that pseudo-mutates your assertions before the agent is allowed to say it is done.

2026-08-01 comparison csharp dotnet

IOptions<T> vs IOptionsSnapshot<T> vs IOptionsMonitor<T> in .NET 11

Default to IOptions<T>. Use IOptionsMonitor<T> when a singleton has to see config reloads, and IOptionsSnapshot<T> only when a scoped consumer wants a value that is stable for one request. The deciding axis is the lifetime of the consumer, not the shape of the settings.

2026-07-30 errors blazor dotnet

Fix: JavaScript interop calls cannot be issued at this time (Blazor prerendering)

Prerendering runs your component on the server with no browser attached, so IJSRuntime throws. Move the call into OnAfterRenderAsync, gate it on RendererInfo.IsInteractive, or disable prerendering.

2026-07-30 errors ef-core ef-core-11

Fix: Your startup project doesn't reference Microsoft.EntityFrameworkCore.Design

Add Microsoft.EntityFrameworkCore.Design to the startup project that dotnet ef builds, not the project holding your DbContext, and pass -s in layered solutions.

2026-07-30 visual-studio ai-agents dotnet

Visual Studio 18.9 Lets You Set Thinking Effort Per Model

Visual Studio 18.9 Insiders 2 adds a per-model thinking effort control with Low through Max levels, exposing the same reasoning-effort dial the underlying model APIs take.

2026-07-29 errors dotnet docker

Fix: Couldn't find a valid ICU package installed on the system in a .NET container

Your base image has no ICU. Either install icu-libs and icu-data-full, switch to an -extra image variant, or set InvariantGlobalization=true and accept ordinal-only string behavior.

2026-07-29 errors csharp dotnet

Fix: Reflection-based serialization has been disabled for this application

This InvalidOperationException means PublishTrimmed or PublishAot flipped JsonSerializerIsReflectionEnabledByDefault to false. Fix it with a source-generated JsonSerializerContext.