Question

I’m trying to find an IOC container that will allow me to have mapping data for a field stored in a database and resolve the interface or object that needs resolved via a string value pulled from the database.

Most of the examples I have seen are using interfaces hard coded in code, I want the interface that needs to be resolved to be dynamic.

This is what I usually see:

var taskController = container.Resolve<ITaskController>();

This is what I would like to see:

var strTaskController = "ITaskController";
var taskController = container.Resolve(strTaskController);

I’m sure I could look through the documentation for all the IOC containers but I am hoping this is an easy question for someone with more IOC experience.

Answer 1

Using Unity you can do what you’re looking for. Basically, if you know the full type name, you can do this first:

var type = Type.GetType("Fully.Qualified.Type.Name");
var resolvedInstance = container.Resolve(type);

EDIT: Based on the comment, here’s another approach:

string typeName = "MyTypeName";
var type = container.Registrations.FirstOrDefault(r => r.RegisteredType.Name == typeName);
if(type != null)
{
    var resolvedInstance = container.Resolve(type.RegisteredType);
}