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Tag: dotnet-11

296 posts · Page 3 of 30

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.

2026-09-11 csharp csharp-15 dotnet-11

C# Unions in ASP.NET Core 11: Bodies, SignalR, and OpenAPI Work, Query Strings Do Not

The ASP.NET Core team mapped out where C# 15 union types flow through .NET 11: minimal API and MVC bodies, SignalR's JsonHubProtocol, Blazor, and OpenAPI anyOf schemas. Route, query, header, and form binding are not supported yet.

2026-09-10 dotnet-11 aspnetcore signalr

SignalR in .NET 11 RC 1 Swaps an Expiring Token Without Dropping the Connection

The SignalR authentication refresh APIs are finalized in .NET 11 RC 1, with renamed callbacks on HubConnection, a TypeScript client, and Blazor Server circuits that pick up the refreshed ClaimsPrincipal automatically.

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.

2026-09-07 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 ef-core ef-core-11 concurrency

How to use pessimistic locking with UPDLOCK and SELECT ... FOR UPDATE in EF Core 11

EF Core 11 still has no lock API. Here is how to take a real row lock with FromSql: WITH (UPDLOCK, ROWLOCK) on SQL Server, FOR UPDATE on PostgreSQL, the subquery trap that silently widens the lock, NOWAIT and SKIP LOCKED, deadlock retries, and what to do when the row does not exist yet.

2026-09-06 ef-core ef-core-11 value-converters

How to write an EF Core 11 value converter that maps a null in the database to a non-null value in code

EF Core never passes null to a value converter by default. Here is the internal convertsNulls constructor that changes that, the IsRequired(false) call it depends on, why it cannot work at all for enums and other value types, the WHERE col = NULL trap it creates, and the two patterns that do the job without an internal API.

2026-09-05 blazor aspnetcore dotnet-11

What is a Blazor render mode and which one runs my component?

A render mode decides where a Razor component executes and whether it is interactive. Here are the four modes in .NET 11, the propagation rules that decide what your component inherits, and the RendererInfo and AssignedRenderMode properties that tell you at runtime which one actually won.

2026-09-05 ef-core dotnet-11 csharp

What is an EF Core interceptor and when do I need one?

An EF Core interceptor is a class EF calls before and after operations like executing a command or SaveChanges, and it can modify or suppress them, not just observe. Here are the seven interception points in EF Core 11, the registration and lifetime rules, and the cases where a query filter or plain logging is the better answer.