AutoMapper issue in IIS7 when using signed assemblies

Question

I am trying to use AutoMapper with a web application running on IIS 7. The intended use is to map the domain types defined in an external dll to view the models defined in the IIS application. This works great unless an external dll is called. Then I get the following error:

AutoMapper.AutoMapperMappingException was unhandled by user code
  Message="Trying to map TestLibrary.Source to WebApplication1.Destination.\nUsing mapping configuration for TestLibrary.Source to WebApplication1.Destination\nException of type 'AutoMapper.AutoMapperMappingException' was thrown."
  Source="AutoMapper"
  StackTrace:
       at AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context)
       at AutoMapper.MappingEngine.Map(Object source, Type sourceType, Type destinationType)
       at AutoMapper.MappingEngine.Map[TSource,TDestination](TSource source)
       at AutoMapper.Mapper.Map[TSource,TDestination](TSource source)
       at WebApplication1._Default.Page_Load(Object sender, EventArgs e)
       at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
       at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
       at System.Web.UI.Control.OnLoad(EventArgs e)
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException: AutoMapper.AutoMapperMappingException
       Message="Trying to map TestLibrary.Source to System.Object.\nUsing mapping configuration for TestLibrary.Source to WebApplication1.Destination\nDestination property: Value\nException of type 'AutoMapper.AutoMapperMappingException' was thrown."
       Source="AutoMapper"
       StackTrace:
            at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.MapPropertyValue(ResolutionContext context, IMappingEngineRunner mapper, Object mappedObject, PropertyMap propertyMap)
            at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.Map(ResolutionContext context, IMappingEngineRunner mapper)
            at AutoMapper.Mappers.TypeMapMapper.Map(ResolutionContext context, IMappingEngineRunner mapper)
            at AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context)
       InnerException: System.Security.SecurityException
            Message="Request failed."
            Source="Anonymously Hosted DynamicMethods Assembly"
            StackTrace:
                 at lambda_method(ExecutionScope , Object )
                 at AutoMapper.Internal.PropertyGetter.GetValue(Object source)
                 at AutoMapper.Internal.MemberGetter.Resolve(ResolutionResult source)
                 at AutoMapper.PropertyMap.ResolveValue(Object input)
                 at AutoMapper.Mappers.TypeMapObjectMapperRegistry.PropertyMapMappingStrategy.MapPropertyValue(ResolutionContext context, IMappingEngineRunner mapper, Object mappedObject, PropertyMap propertyMap)
            InnerException: 

Steps to reproduce the problem:

1) Create a new web application using Visual Studio 2008 on a computer with IIS 7. (We use windows 7).

2) Download AutoMapper.dll from http://www.codeplex.com/AutoMapper . (We are using version 0.4.xx) and add a link to this Dll in your web application.

3) :

using System;
using AutoMapper;
using TestLibrary;

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Mapper.CreateMap<Source, Destination>();
            Mapper.AssertConfigurationIsValid();

            var source = new Source {Value = "Automapper works!" };
            var destination = Mapper.Map<Source, Destination>(source);

            Response.Clear();
            Response.ContentType="text/plain";
            Response.Write(destination.Value);
            Response.End();
        }
    }

    public class Destination
    {
        public object Value { get; set; }
    }

4) "TestLibrary" Class1.cs Source.cs :

namespace TestLibrary
{
    public class Source
    {
        public object Value { get; set; }
    }
}

5) -.

6) , , "Automapper !" .

7) , .
 i) - IIS Visual Studio.  ii) TestLibrary.   , .

- , ? , IIS.

Answer 1

, lambda- . , Default.aspx.cs? - :

> expr =() = > 5;

do:

var func = expr.Compile();

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