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Tag: dotnet

439 posts · Page 7 of 44

2026-09-13 agent-framework dotnet ai-agents

Agent Framework 1.21: LocalCodeAct Stops Handing Your Host Environment to Model-Written Python

Microsoft Agent Framework .NET 1.21.0 ships Microsoft.Agents.AI.LocalCodeAct 1.21.0-preview.260911.1, which no longer lets the CodeAct Python subprocess inherit the parent environment when Environment is null. On 1.20, generated code could read every host variable, API keys included.

2026-09-12 dotnet-11 containers sdk

.NET 11 RC 1 Makes dotnet publish Container Images Reproducible

The .NET 11 RC 1 SDK honors SOURCE_DATE_EPOCH when publishing container images, strips the process id from layer tar headers, and skips blob uploads when the registry already has the manifest. Same commit in, same digest out.

2026-09-12 comparison csharp dotnet

Lookup<TKey, TElement> vs Dictionary<TKey, List<TValue>> for duplicate keys in C#

Use ToLookup when you group once and only read: it is immutable, returns an empty sequence for missing keys, accepts null keys and keeps first-seen order. Use Dictionary<TKey, List<TValue>> when the groups change after construction or cross a JSON boundary.

2026-09-09 dotnet-11 csharp process

.NET 11 RC 1 Lets You SIGTERM a Child Process Without P/Invoke

Signal, WaitForExitStatus, and ProcessExitStatus land directly on System.Diagnostics.Process in .NET 11 RC 1, so graceful shutdown of a child process no longer needs a kill P/Invoke or a SafeProcessHandle detour.

2026-09-08 errors ef-core ef-core-11

Fix: MissingMethodException 'AbstractionsStrings.ArgumentIsEmpty' after upgrading EF Core Tools

dotnet ef throws MissingMethodException on ArgumentIsEmpty because Tools 10.0.6 stopped pulling a matching Microsoft.EntityFrameworkCore.Design. Pin Design explicitly to your EF Core version.

2026-09-08 dotnet testing rider

Rider 2026.3 EAP: dotCover Finally Measures TUnit Coverage

The Rider 2026.3 Early Access Program opened on September 7, 2026. Buried under rainbow brackets is the one line that changes a build: dotCover now reports coverage for TUnit tests, given Microsoft.Testing.Platform 2.3.0 and one package reference.

2026-09-07 dotnet dotnet-11 csharp

How to consume an RFC 9457 ProblemDetails response from a typed HttpClient without referencing ASP.NET Core

The BCL has no ProblemDetails type, and adding a FrameworkReference to Microsoft.AspNetCore.App makes your client refuse to start on a runtime-only container. Here is the 20-line model that does the job, the DelegatingHandler that turns problem+json into a typed exception, and the content-type myth that most answers still repeat.

2026-09-07 dotnet dotnet-11 csharp

How to find the async void handlers causing ANRs in a .NET MAUI Android app

Play Console tells you your ANR rate is over 0.47% and hands you a native stack full of libcoreclr.so frames. Here is how to get from that useless trace to the exact async void event handler that blocked the main thread, using a Looper printer, a SynchronizationContext wrapper that names the state machine, and dotnet-trace over dsrouter.

2026-09-06 microsoft-agent-framework ai-agents llm

How to Give a Microsoft Agent Framework Agent Persistent Memory with Azure Cosmos DB

Agent Framework ships an in-memory chat history provider and nothing else for .NET. Here is a Cosmos DB backed ChatHistoryProvider that survives process restarts, the container design that keeps a 200-turn session cheap, and the second provider you need if you want semantic recall across sessions.

2026-09-04 mstest native-aot testing

MSTest 4.4 Graduates the Reflection Source Generator, and Native AOT Projects Get It Automatically

MSTest 4.4 moves MSTest.SourceGeneration out of experimental and aligns it with the MSTest version. Native AOT test projects pick it up with no opt-in, ReflectionFree mode can now skip runtime discovery for plain [TestMethod] and [DataRow], and five AOTSG diagnostics tell you which test shapes will not survive.