C# Activator ^new^ Jun 2026

The System.Activator class in C# is a powerful utility within the System namespace that provides methods to create instances of types locally or remotely. It is a cornerstone of , allowing developers to instantiate objects when the specific type is only known at runtime, such as in plugin architectures or dynamic factory patterns. Core Functionality: Activator.CreateInstance

However, the Activator is optimized. While slower than the new keyword, Activator.CreateInstance is generally significantly faster than the older, more general MethodInfo.Invoke method used for constructor invocation. For most applications, the performance hit is negligible. However, in high-performance loops (e.g., creating millions of objects per second), relying on Activator can become a bottleneck. In such critical paths, developers often turn to compiled expression trees or System.Reflection.Emit to generate factories at runtime, caching the delegate for speed. c# activator

Activator is a static class in the System namespace used to create instances of types , when the type is not known at compile time. The System

: While most modern DI containers like Microsoft.Extensions.DependencyInjection handle this, Activator is often the underlying mechanism for manual service resolution. While slower than the new keyword, Activator

The simplest usage involves creating an instance of a known type dynamically:

Common exceptions include TypeLoadException , MissingMethodException (if no matching constructor is found), and TargetInvocationException (if the constructor itself throws an exception). Robust error handling is mandatory when using the Activator . A developer must wrap dynamic instantiation in try-catch blocks or validate the type information rigorously before attempting creation to prevent application crashes.

using System;