Activator uses reflection and is slower than direct new or compiled delegates. For performance-critical repeated instantiation, cache delegates or use FormatterServices.GetUninitializedObject (advanced scenarios).
With great flexibility comes significant responsibility. Unlike the new keyword, which catches constructor errors at compile time, Activator.CreateInstance defers these checks to runtime. If the type cannot be found, the constructor arguments do not match, or the type is abstract/static, the Activator will throw exceptions. c# activator
Real-world applications rarely consist solely of classes with parameterless constructors. The Activator class excels in its ability to handle constructors that require arguments. By passing an array of objects to the CreateInstance method, the runtime attempts to match the provided arguments to the most appropriate constructor overload. Activator uses reflection and is slower than direct
Activator is a static class in the System namespace used to create instances of types , when the type is not known at compile time. Unlike the new keyword, which catches constructor errors