Question

I have got some code to load an assembly and get all types, which implement a certain interface, like this (assume asm is a valid and loaded assembly).

var results = from type in asm.GetTypes()   where typeof(IServiceJob).IsAssignableFrom(type)   select type; 

Now I’m stuck: I need to create instances of these objects and invoke methods and properties on the object. And I need to store the references to the created objects in an array for later usage.

Answer 1

Oh wow – I only blogged about this a few days ago. Here’s my method to return instances of all the types that implement a given interface:

private static IEnumerable<T> InstancesOf<T>() where T : class {     var type = typeof(T);     return from t in type.Assembly.GetExportedTypes()            where t.IsClass                && type.IsAssignableFrom(t)                && t.GetConstructor(new Type[0]) != null            select (T)Activator.CreateInstance(t); } 

If you refactor this to accept an assembly parameter rather than using the interface’s assembly, it becomes flexible enough to suit your need.