InvalidProgramException - 'Common Language Runtime detected an invalid program.' IIS Express only

gistfile1.cs

/* Generating a proxy of a Type and overriding a virtual property with this method blows up in IIs Express, but works fine in unit tests (nunit, resharper) and 
local IIS. This is using VS Community 2013 on Windows 8 */

public override T OverrideProperty<T>(string propertyName, Type attribute = null, Type [] constructorParams = null, object [] constructorValues = null)
{
    // [ML] - Default to an empty instance 

    constructorParams = constructorParams ?? Type.EmptyTypes;
    constructorValues = constructorValues ?? new object[] { null };

    var type = typeof(T);

    // [ML] - Proxy the class

    var proxyNamespace = new AssemblyName(this.GetType().Namespace + ".Proxied");
    var assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(proxyNamespace, AssemblyBuilderAccess.Run);
    var module = assembly.DefineDynamicModule(proxyNamespace.Name);
    var proxyType = module.DefineType(type.Name + "Proxy", TypeAttributes.Public, type);

    // [ML] - Override the virtual converted value

    var oldProp = type.GetProperty(propertyName);

    if (oldProp != null && oldProp.GetGetMethod().IsVirtual)
    {
        var newProp = proxyType.DefineProperty(oldProp.Name, oldProp.Attributes, oldProp.PropertyType, null);

        // [ML] - Add the custom attribute
        if (attribute != null)
        {
            var ctor = attribute.GetConstructor(constructorParams);

            if (ctor != null)
            {
                newProp.SetCustomAttribute(new CustomAttributeBuilder(ctor , constructorValues, new FieldInfo[0], new object[0]));
            }
        }

        // [ML] - Define a placeholder for a getter and setter of the new override property on the proxy class

        var attributes = MethodAttributes.Virtual | MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig;

        var pGet = proxyType.DefineMethod("get_" + oldProp.Name, attributes, oldProp.PropertyType,Type.EmptyTypes);
        var pSet = proxyType.DefineMethod("set_" + oldProp.Name, attributes, null, new[] {oldProp.PropertyType});

        // [ML] - Give the getter a method body

        ILGenerator pILGet = pGet.GetILGenerator();

        pILGet.Emit(OpCodes.Ldarg_0);
        pILGet.Emit(OpCodes.Call, oldProp.GetGetMethod());
        pILGet.Emit(OpCodes.Ret);

        // [ML] - Give the setter a method body

        ILGenerator pILSet = pSet.GetILGenerator();

        pILSet.Emit(OpCodes.Ldarg_0);
        pILSet.Emit(OpCodes.Ldarg_1);
        pILSet.Emit(OpCodes.Call, oldProp.GetSetMethod());
        pILSet.Emit(OpCodes.Ldarg_0);
        pILSet.Emit(OpCodes.Ldstr, oldProp.Name);

        // [ML] - Setter and getter for new overriden property on proxy class

        newProp.SetSetMethod(pSet);
        newProp.SetGetMethod(pGet);
    }

    // [ML] - Create and return a an instance

    var newType = proxyType.CreateType();

    return (T)Activator.CreateInstance(newType);
}

/* When I try to set the value of the overriden property using the code below, this blows up in IIS express with an InvalidProgramException
and the message 'Common Language Runtime detected an invalid program.'. Stack trace gives nothing away but pasted at bottom anyway */

...

var proxy = _emitter.OverrideProperty<T>("ConvertedValue", attribute, ctorParams, ctorValues);
var proxyType = proxy.GetType();

var proxyObject = JsonConvert.DeserializeObject("A json string", proxyType) as T;
var convertProperyInfo = proxyObject.GetType().GetProperty("ConvertedValue");

proxyObject.ConvertedValue = 1;

...

/* This may be my complete lack of fully understanding opcodes, but just seems weird it works in IIS and Unit tests, but not in IIS Express.
I think i remember reading somewhere that IIS doesnt propogate all exception regarding the JIT compiler, but have no evidence to back this up, feels like a bug with IIS Express.


[InvalidProgramException: Common Language Runtime detected an invalid program.]
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