c# - How to "EnforceConstraints" to avoid linq errors?

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I'm working on a sample
from the book I bought. And, for unknown reason, I get the following error message "
Could not find an implementation of the query pattern for source type
'System.Type'. 'Where' not found."

The VS2008 help says that I need to add
System.Linq and System.Collections namespaces to solve the issue. Unfortunatelly, I
still get the same error message. In MSDN forum, it said that I need to set
EnforceConstraints to true;

I would like to know
what's "EnforceConstraints" and how can I do
it.

Thanks.

/>

using System;

using System.Data;
using System.Configuration;
using
System.Linq;
using System.Web;
using
System.Web.Security;
using System.Web.UI;

using
System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using
System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using
System.Web.Mvc;
using Castle.Windsor;
using
Castle.Windsor.Configuration.Interpreters;
using
Castle.Core.Resource;
using System.Reflection;
using
Castle.Core;

using
System.Collections;

namespace
WebUI
{
public class WindsorControllerFactory :
DefaultControllerFactory
{
WindsorContainer
Container;

 public
            WindsorControllerFactory()
 {

 //Instatiate a container,
            taking configuration from web.conf
 Container = new
            WindsorContainer(
 new XmlInterpreter(new ConfigResource("Castle"))

            );

 //Also register all the controller types as
            transient
 var controllerTypes =
 from t in
            Assembly.GetExecutingAssembly().GetType()
 where
            typeof(IController).IsAssignableFrom(t)
 select t;


            foreach (Type t in controllerTypes)

            Container.AddComponentWithLifestyle(t.FullName, t, LifestyleType.Transient);

            }

 //Constructs the controller instance needed to service each
            request
 protected override IController GetControllerInstance(Type
            controllerType)
 {
 return
            (IController)Container.Resolve(controllerType);
 }
            


 }//The
            constructor
}

/>

The sample is on page
98.

the book is "Pro ASP.NET MVC
Framework"/Steven Sanderson/APress ISBN-13 (pbk): 978-1-4302-1007-8

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Answer

In the
line:

from t in
            Assembly.GetExecutingAssembly().GetType()

you
are missing a 's' at the end of GetTypes(). This should solve
the problem, as GetType() is returning a single
Type instance, whereas GetTypes()
returns an array of Type objects.