Start Debugging

Tag: dotnet

442 posts · Page 3 of 45

2026-10-07 comparison redis aspnetcore

Redis key prefix vs separate database vs separate instance for multi-tenant caching in ASP.NET Core

Use a tenant key prefix on one shared Redis for almost every multi-tenant ASP.NET Core app, move only tenants with contractual isolation or noisy workloads to their own instance, and skip numbered databases: Redis Cluster, Azure Managed Redis and Redis Cloud only have database 0.

2026-10-07 microsoft-agent-framework ai-agents llm

What Is the Agent Harness in Microsoft Agent Framework

The Agent Harness is Microsoft Agent Framework's batteries-included runtime: one call (AsHarnessAgent in .NET, create_harness_agent in Python) wraps any chat client in a tool loop with todos, plan/execute modes, file memory, tool approval, compaction and OpenTelemetry. Here is what it actually sends to the model on Microsoft.Agents.AI.Harness 1.23.0, what it costs per call, and how to trim it.

2026-10-06 errors efcore ef-core-11

Fix: Invalid column name 'Value' when using SqlQueryRaw<T> for a scalar result in EF Core

EF Core wraps a scalar SqlQuery<T> in a subquery and selects a column named Value as soon as you add First, Where, Max or Single. Alias your SQL column AS Value, or materialize first.

2026-10-06 errors ef-core ef-core-10

Fix: There is already an object named 'X' in the database after resetting EF Core migrations

After you delete the Migrations folder and scaffold a new InitialCreate, EF Core does not know your tables exist. Drop a dev database, or record the new migration in __EFMigrationsHistory without running it.

2026-10-06 mstest winui uwp

MSTest 4.5 Runs UWP and WinUI 3 UI Tests Without VSTest

MSTest.Sdk 4.5 and Microsoft.Testing.Platform 2.5 make the UWP or WinUI 3 app the test host itself. [UITestMethod] runs each test on the real dispatcher, packaged and AppContainer apps are activated by AUMID through a sidecar controller, and unpackaged WinUI finally works.

2026-10-05 orleans dotnet streaming

Orleans 10.4: Stream Subscriptions Can Now Start From the Oldest Cached Message

Orleans 10.4.0 adds StreamSubscriptionStartPosition.EarliestAvailable, so a new stream subscriber can replay what is still in the pulling agent's queue cache. The release also changes RPC argument wire IDs, request-latency metrics, and SQLite persistence scripts.

2026-10-04 dotnet dotnet-10 csharp

How to add a strong-named assembly's full public key to InternalsVisibleTo in an SDK-style project

A signed assembly must name its friend by the full 320-character public key, not the token, or the build fails with CS1726 or CS0281. Get the key with sn -p and sn -tp, or with a cross-platform .NET script, then put it in the Key metadata of an InternalsVisibleTo item in the .csproj. Covers the PublicKey property fallback, Moq's DynamicProxyGenAssembly2 key, and the line-break trap.

2026-10-04 dotnet dotnet-10 csharp

How to detect Windows session lock, unlock, logon and logoff events in a C# app

Use SystemEvents.SessionSwitch in a desktop or console app, override OnSessionChange in a Windows service, or hook WM_WTSSESSION_CHANGE yourself. Covers .NET 10 code for all three, the hidden '.NET System Events' thread, why services see logon but desktop apps do not, out-of-order notifications, and how to query the current lock state with WTSQuerySessionInformation.

2026-10-04 nunit testing dotnet

NUnit 5: Assert.ThrowsAsync Now Returns a Task, and an Unawaited One Passes Silently

NUnit 5.0.0 makes Assert.ThrowsAsync, CatchAsync and DoesNotThrowAsync truly asynchronous. Forget the await and the assertion never runs. Here is what breaks, what the NUnit.Analyzers NUnit2059 rule catches, and the other NUnit 5 changes to check before upgrading.

2026-10-03 csharp dotnet async

How to wait for a ValueTask synchronously in a non-async method without allocating

Check IsCompleted first and read the result through GetAwaiter().GetResult(), which costs 0 bytes. Only fall back to blocking when the ValueTask is still pending, and do that with a cached event and UnsafeOnCompleted instead of AsTask(), which allocates 72 to 208 bytes per call. Measured on .NET 10 and .NET 11 RC1.