A comprehensive guide to C# reflection in .NET 10 covering core APIs (Type, Assembly, PropertyInfo, MethodInfo, ConstructorInfo, Activator.CreateInstance), BindingFlags usage, and performance patterns. Explains how to cache reflection results using ConcurrentDictionary and FrozenDictionary, and when to avoid reflection entirely. Covers alternatives including expression trees for compiled delegates, source generators, UnsafeAccessor (.NET 8+), and interface-based design. Also addresses AOT/trimming considerations with DynamicallyAccessedMembers and security risks of accessing private members dynamically.
Table of contents
What Is C# Reflection?Core Reflection TypesActivator.CreateInstance -- The Quick Instantiation PathBindingFlags -- Controlling Member DiscoveryPerformance in .NET 10 -- The Real StoryWhen NOT to Use ReflectionAlternatives to ReflectionPractical Example -- A Simple Property MapperFAQSummary258 Impressions