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Tag: dotnet

442 posts · Page 6 of 45

2026-09-20 agent-framework dotnet ai-agents

Agent Framework 1.22: AsIChatClient Lets an AIAgent Pose as an IChatClient

Microsoft Agent Framework .NET 1.22.0 adds AIAgent.AsIChatClient(), closing the round trip with IChatClient.AsAIAgent(). Your agent, with its instructions and tools intact, now plugs into any API that takes an IChatClient.

2026-09-19 messagepack security signalr

MessagePack 3.1.9 and 2.5.303 Fix a 32 KiB Payload That Allocates 120 MiB

CVE-2026-92707: nested MessagePack array headers could reuse the same trailing bytes to pass the length check, so deserializing into object allocated thousands of times the payload size. The fix, a before/after probe, and why SignalR apps on .NET 8 through 11 RC 1 need a direct package pin.

2026-09-18 polly resilience dotnet

Polly 8.8 Reloads a Resilience Pipeline From Your Own IOptionsMonitor

Polly 8.8.0 adds EnableReloadsWithMonitor, so a resilience pipeline can hot-reload from a feature flag or remote config monitor that is not registered in DI. A probe shows the rebuild, and one trap: context.GetOptions still reads the DI monitor and returns defaults.

2026-09-17 comparison dotnet dotnet-11

Microsoft.Data.SqlClient vs System.Data.SqlClient in .NET 11

Use Microsoft.Data.SqlClient. System.Data.SqlClient is deprecated, already emits CS0618 on every type you touch, and loses its .NET assets when .NET 8 goes end of support on November 10, 2026, the same day .NET 11 ships. The measured feature gap, the Encrypt default that breaks the migration, and the 7.0 package split.

2026-09-17 mstest testing csharp

MSTest 4.4.1 Fixes the CS0121 Ambiguous Assert Calls That 4.4.0 Broke Below C# 14

MSTest 4.4.0 added Span<T> and ReadOnlySpan<T> overloads to Assert.Contains and Assert.DoesNotContain, which made ordinary array and string assertions fail with CS0121 on net8.0, net9.0, or any project below C# 14. MSTest 4.4.1, published on 2026-09-16, adds exact array overloads and constrained forwarders. Two explicit-generic call shapes still fail.

2026-09-17 comparison dotnet dotnet-11

Process.Run vs Process.Start in .NET 11: which should you use?

Use Process.Run when you start a tool and only care how it exited: one call, a timeout that kills the child, and a ProcessExitStatus with the signal. Keep Process.Start when you need the Process object: writing to stdin, reading output as it arrives, UseShellExecute, or killing a whole process tree.

2026-09-16 dotnet dotnet-11 jit

The .NET 11 JIT Devirtualizes Generic Virtual Methods, and the Allocation Goes With Them

Stephen Toub's Performance Improvements in .NET 11 post shows generic virtual method calls dropping from 6.7 ns and 24 bytes to 1.8 ns and zero allocation. Three RyuJIT pull requests unlocked inlining on the dispatch that used to be the most opaque one in .NET.

2026-09-16 errors dotnet dotnet-10

Fix: UIKitThreadAccessException from MediaPicker.PickPhotosAsync when selecting multiple photos in .NET MAUI iOS

Picking 2 or more photos on iOS throws UIKitThreadAccessException in MAUI 10.0.100 and 10.0.101. MAUI reads PHPickerResult.ItemProvider after an await, off the main thread. Pin 10.0.90, upgrade to 10.0.110, or use a PHPicker shim.

2026-09-15 dotnet ai microsoft-extensions-ai

Microsoft.Extensions.AI 10.10 Fails Evaluation Metrics the Judge Never Scored

Microsoft.Extensions.AI.Evaluation.Quality 10.10.0 now marks unparseable and out-of-range quality scores as failed, and Microsoft.Extensions.AI.OpenAI 10.10.0 drops the Assistants adapter. Measured before and after on 10.9.0.

2026-09-14 dapper dotnet csharp

Dapper 2.1.86 brings back DateOnly and TimeOnly, two years after pulling them

Dapper 2.1.86 re-enables built-in DateOnly and TimeOnly mapping for parameters, members, and scalars, with the column-offset and silent default(T) bugs fixed. What changed, what I measured, and what it means for your custom type handlers.