dotnet-csharp-type-design-performance

What problem does it solve?

This Skill addresses critical upfront type design choices in .NET that significantly impact application performance and maintainability throughout their lifecycle.

Core Features & Use Cases

• Struct vs. Class Decision Matrix: Guides the selection between struct and class based on size, lifetime, and identity.
• readonly struct: Eliminates defensive copies for immutable value types.
• ref struct and Span<T>/Memory<T>: Optimizes memory access for stack-allocated or contiguous data.
• Collection Type Selection: Recommends FrozenDictionary, ImmutableDictionary, ConcurrentDictionary, and Dictionary based on usage patterns.
• Use Case: When designing a new data structure for high-frequency calculations, this Skill helps determine if a readonly struct or a class is more appropriate, considering memory allocation and copy costs.

Quick Start

Use the dotnet-csharp-type-design-performance skill to understand when to use a struct versus a class for a new data type.