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Creating MVC Controller Factories with Windsor


You can setup dependency injection just by implementing the IControllerFactory interface or inheriting from DefaultControllerFactory. Default controller factory is preferred as it takes care of providing you more than just a controller name like Customer. Doing this manually is not great as you can see from the example below.

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Web.Mvc;
using System.Web.Routing;
using System.Linq;

namespace MVCSamples.Infrastructure
{
    public class WindsorControllerFactory : IControllerFactory
    {

        private IEnumerable<Type> _controllerTypes;

        public IController CreateController(RequestContext requestContext, string controllerName)
        {
            BuildDefaultControllerTypes();
            return IoC.Resolve(GetTypeNameForController(controllerName)) as IController;
        }

        public void BuildDefaultControllerTypes()
        {
            if (_controllerTypes == null || !_controllerTypes.Any())
                _controllerTypes = Assembly.GetExecutingAssembly().GetTypes().Where(x => x.Name.EndsWith("Controller")).ToList();
        }

        public string GetTypeNameForController(string controllername)
        {
            return _controllerTypes.First(x => x.Name == String.Format("{0}Controller", controllername)).FullName;
        }

        public void ReleaseController(IController controller)
        {
            var disposablecontroller = controller as IDisposable;
            if (disposablecontroller != null) disposablecontroller.Dispose();
            IoC.Release(controller);
        }
    }
}

The second implementation below is not so naive. The DefaultControllerFactory takes care of finding the controller type for you. Just override the GetControllerInstance Method.

using System;
using System.Web.Mvc;

namespace MVCSamples.Infrastructure
{
    public class WindsorControllerFactory : DefaultControllerFactory
    {

        protected override IController GetControllerInstance(Type controllerType)
        {
            return IoC.Resolve(controllerType) as IController;
        }

        public override void ReleaseController(IController controller)
        {
            var disposablecontroller = controller as IDisposable;
            if (disposablecontroller != null) disposablecontroller.Dispose();
            IoC.Release(controller);
        }
    }
}

Blair

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