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Tag: dotnet

346 posts · Page 13 of 35

2026-06-20 csharp dotnet async

What is ValueTask<T> and when is it worth it?

ValueTask and ValueTask<T> are structs that let an async method return a result without heap-allocating a Task when it completes synchronously. The win is one fewer allocation on hot paths that usually finish without awaiting. The cost is a strict await-once contract. Here is what the type actually is, how it works, and the narrow set of cases where it earns its keep.

2026-06-19 csharp dotnet dotnet-11

What is a source generator and when do I need one?

A plain-language guide to C# source generators: what they actually do, how the IIncrementalGenerator pipeline works, when they beat reflection or T4, and the cases where you should not reach for one. With runnable examples on .NET 11 and C# 14.

2026-06-19 csharp dotnet dotnet-11

What is IAsyncEnumerable<T> and when should I use it?

IAsyncEnumerable<T> is the interface for asynchronous streams: a sequence whose elements arrive over time and each one may require an await. Here is what it actually is, how await foreach and yield drive it, and the rule for when to reach for it over Task<List<T>>.

2026-06-19 dotnet native-aot performance

What is Native AOT and what does it cost you?

Native AOT compiles your .NET app to a single self-contained native binary with no JIT, buying fast startup and a small memory footprint. The price is a C toolchain at build time, slower publishes, per-RID builds, no reflection or Reflection.Emit, mandatory trimming, and no Dynamic PGO. Here is the full ledger.

2026-06-14 dotnet dotnet-11 ef-core

EF Core 11's New EF1004 Analyzer Catches a Silent Async Mistake

EF Core 11 Preview 5 ships the EF1004 analyzer. It flags ToAsyncEnumerable() on an IQueryable so you do not accidentally enumerate a database query synchronously inside an await foreach.

2026-06-14 comparison dotnet aspnetcore

HybridCache vs IMemoryCache vs IDistributedCache in .NET 11: which should you pick?

Default to HybridCache for new caching code in .NET 11. Reach for IMemoryCache only when you need raw single-server speed with no serialization, and IDistributedCache only as a backing store. Here is the decision matrix.

2026-06-13 errors dotnet httpclient

Fix: The SSL connection could not be established with HttpClient

The inner AuthenticationException tells you the real cause: an untrusted chain, a name mismatch, or a TLS version gap. Trust the cert, fix the host name, or align protocols. Do not blanket-disable validation.

2026-06-13 comparison llm ai-agents

Hangfire vs Quartz.NET vs IHostedService for scheduled LLM jobs

Use Quartz.NET when an LLM job must run on a real cron and never overlap itself, Hangfire when each run must survive a restart and retry on rate limits, and a plain BackgroundService only for a loose in-process loop. A decision matrix with the cron and concurrency gotchas that pick for you.

2026-06-12 errors aspnetcore dotnet

Fix: The antiforgery token could not be decrypted in ASP.NET Core

The error means Data Protection lost the key that signed the token. Persist keys to a shared, durable store and call SetApplicationName so every instance reads the same key ring.

2026-06-12 errors csharp dotnet

Fix: The entity type 'X' requires a primary key to be defined in EF Core 11

EF Core can't find a key for your type. Either name a property Id or {Type}Id, add [Key], call HasKey, or - if it is a view or raw SQL result - call HasNoKey.