Question

For a given repository interface IRepository<T> where T: Base and a bunch of classes that inherit Base (for instance, Text) how do you create instances of a provider that implements IRepository, for instance JsonRepository<T> with Text as T (JsonRepository<Text>) and run methods on it?

I’d like to use reflection with a for or foreach to create instances of repositories for all the classes inheriting Base and perform some data management functions on them.

What I want to avoid – if you had 100 classes inheriting Base class you obviously wouldn’t go creating instances manually in code and then running it?

Answer 1

You can use Activator.CreateInstance

See an example here:

Modified to your example:

var d1 = typeof(JsonRepository<>);
Type[] typeArgs = { typeof(Text) };
var makeme = d1.MakeGenericType(typeArgs);
object o = Activator.CreateInstance(makeme);