List all the classes that implement a specific interface

Question

My requirement is something as below: I need a method which takes a parameter as an Interface name and the return type should be list of all the classes that implement the interface using reflection.

Vulpes · Answer

First create a class library, mydll2.dll, from the code below: public interface IFace {} public class ClassA : IFace {} public class ClassB : IFace {} public class ClassC : ClassA {} public class ClassD : IFace {} public class ClassE {} Now create a console app from the following code and place the dll in the executable's folder: using System; using System.Reflection; using System.Collections.Generic; class Test { static Assembly assembly; static void Main() { assembly = Assembly.LoadFrom("mydll2.dll"); IList list = GetAllImplementingTypes("IFace"); foreach(string typeName in list) Console.WriteLine(typeName); Console.ReadKey(); } static IList GetAllImplementingTypes(string interfaceName) { List list = new List (); foreach(Type t in assembly.GetTypes()) { if (t.GetInterface(interfaceName) != null) list.Add(t.FullName); } return list; } } The output should be: ClassA ClassB ClassC ClassD Notice that ClassC is returned because it implements IFace by virtue of deriving from ClassA.

Akkiraju Ivaturi · Answer

Thanks for the code and it gives me answer to my question. Appreciate your time for this.