What are the .NET 8 features?

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**.NET 8 features** — improvements for developers. **1. Primary constructors (C# 12):** ```csharp public class Person(string name, int age) { } ``` **2. Collection expressions (C# 12):** ```csharp List numbers = [1, 2, 3]; int[] array = [..numbers, 4, 5]; ``` **3. Frozen collections:** ```csharp var frozen = dict.ToFrozenDictionary(); ``` **4. SearchValues:** ```csharp var values = SearchValues.Create("aeiou"); bool hasVowel = "hello".AsSpan().IndexOfAny(values) >= 0; ``` **5. Priority queue:** ```csharp var queue = new PriorityQueue(); queue.Enqueue("low", 3); queue.Enqueue("high", 1); ``` **6. Lock type:** ```csharp private readonly Lock _lock = new Lock(); ``` **7. Time abstraction:** ```csharp builder.Services.AddTimeProvider(); ``` **Performance improvements:** - Faster JSON serialization. - Reduced allocations. - Better JIT optimizations.

C#: What are the .NET 8 features?