Early DI frameworks or custom containers used Activator.CreateInstance to resolve services dynamically.
From a software development perspective, an "activator" in .NET 4.6.1 refers to the System.Activator class. This class contains methods to create types of objects locally or remotely, or to obtain references to existing remote objects. This is highly utilized in reflection, plugin architectures, and dynamic dependency injection frameworks. Key Methods in System.Activator
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The DefaultControllerFactory in MVC 5 (running on .NET 4.6.1) used Activator.CreateInstance to instantiate controllers.
Always wrap activation in try-catch blocks. Activator.CreateInstance can throw a variety of exceptions, including MissingMethodException , ArgumentException , and TargetInvocationException (if the constructor throws an exception). Early DI frameworks or custom containers used Activator
While Activator is convenient, for high-performance scenarios (e.g., creating millions of objects), you should cache a delegate.
Note: Under the hood in .NET 4.6.1, new T() still uses a variation of the activator mechanism, but the compiler optimizes it where possible. 2. Compiled Expression Trees (The Fastest Approach) This is highly utilized in reflection, plugin architectures,
.NET Framework 4.6.1 still supports Code Access Security (CAS) in legacy scenarios. The Activator class has specific demands: