Activators Dotnet 4.6.1

in .NET 4.6.1 are a core component of the System namespace, primarily centered around the System.Activator class. This class provides static methods to create instances of types locally or remotely, or to obtain references to existing objects.

This happens if you try to use CreateInstance on a class that does not have a public constructor matching the arguments you provided. activators dotnet 4.6.1

The biggest criticism of Activator.CreateInstance is . Reflection-based instantiation can be 30–50x slower than new . The biggest criticism of Activator

Type listType = typeof(List<>); Type elementType = typeof(Customer); // Determined at runtime Type elementType = typeof(Customer)

| Method | Speed | Constructor flexibility | Requires new() | |--------|-------|------------------------|------------------| | new T() | Fastest | Parameterless only | Yes | | Activator.CreateInstance<T> | Slow | Parameterless only | Yes | | Activator.CreateInstance(Type, object[]) | Slowest | Any public constructor | No | | ConstructorInfo.Invoke | Slow | Any constructor | No | | Compiled Lambda (Expression) | Fast (cached) | Any constructor | No |

return (T)_cache[t]();