Ayende @ Rahien

Mark Whitfeld commented on Can you hack this out?

Fri, 27 Nov 2009 07:39:06 GMT

Hmmm.... If this is possible, then I'm hoping that there are some pretty ground breaking improvements to Rhino Mocks in the near future :)

Arielr commented on Can you hack this out?

Thu, 26 Nov 2009 19:06:05 GMT

Oren, Yeah, I know. Fun, ain't it? :)

dexon commented on Can you hack this out?

Wed, 25 Nov 2009 20:15:40 GMT

Maybe something like this: var irunner = typeof(AssemblyRunner).GetInterface("IRunner"); .... TypeBuilder myType = myModule.DefineType("MyRunner", TypeAttributes.Public | TypeAttributes.Class, null, new Type[]{ irunner }); MethodBuilder exMethod = myType.DefineMethod("Execute", MethodAttributes.Public, typeof(void), new Type[]{}); ILGenerator ilgen = exMethod.GetILGenerator(); ilgen.EmitWriteLine("before executing"); // call to AssemblyRunner.Execute ilgen.EmitWriteLine("after executing"); Type finished = myType.CreateType(); Type[] typeArgs = {finished}; Type constructed = typeof(CompositeRunner<>).MakeGenericType(typeArgs); MethodInfo mi = constructed.GetMethod("Execute"); mi.Invoke(Activator.CreateInstance(constructed, null, null), null); It's allready passing through typeof(IRunner).IsAssignableFrom(typeof(T)) but failing on var runner = (IRunner)new T();

Ayende Rahien commented on Can you hack this out?

Tue, 24 Nov 2009 11:26:41 GMT

Arielr, That is pretty much cheating.

Arielr commented on Can you hack this out?

Tue, 24 Nov 2009 08:05:47 GMT

Change the System.Console.WriteLine() function in mscorlib, and do with it what you want. [www.blackhat.com/.../...agedCodeRootkits-PAPER.pdf](http://www.blackhat.com/presentations/bh-usa-09/METULA/BHUSA09-Metula-ManagedCodeRootkits-PAPER.pdf)

liviu commented on Can you hack this out?

Mon, 23 Nov 2009 11:28:17 GMT

I said resharper, i ment reflector... I think the challange is related either to EF or to L2S profiling...

hpower11 commented on Can you hack this out?

Mon, 23 Nov 2009 11:05:18 GMT

Ayende: You said "The real problem was a bit harder" And by far no one has manage to solve the "easier one" Can you please enlighten us with at list some hints. Also I am very curious about the real challenge you had.

Van commented on Can you hack this out?

Mon, 23 Nov 2009 07:45:25 GMT

Anthony Dewhirst: I think the cast can be handled with explicit operator. I still cannot figure out how to trick the typeof(T) to return the Type that I wanted.

Anthony Dewhirst commented on Can you hack this out?

Mon, 23 Nov 2009 06:56:56 GMT

David: if you do override IsAssignableFrom you still have to get past the cast on the next line. Ayende: Do you need to some how push the IRunner interface that you get using reflection into the RuntimeTypeCache for the new object or am I heading in the wrong direction?

Alex Simkin commented on Can you hack this out?

Mon, 23 Nov 2009 01:39:11 GMT

@liviu "resharper on L2S Profiler :--))" Did that, understand how he solved the task at hand, still cannot solve this one.

David commented on Can you hack this out?

Sun, 22 Nov 2009 23:53:06 GMT

I agree with Anthony, can we have some more hints, at work we are having fun in our lunch break on this one ;) @ Whut, how does you code look right now? I think to get round the IsAssignableFrom, you have to Inherit off the Type Class, override this function to return true and then use the System.Reflection.Emit to force the code to use your Type class. thing is I have yet to figure out how to do that @ Ayende, the class type you pass into the CompositeRunner does not inherit of IRunner? its just a class that has an execute function, and you make it always return true on the IsAssignableFrom?

liviu commented on Can you hack this out?

Sun, 22 Nov 2009 23:14:42 GMT

I think the solution can be found by using resharper on L2S Profiler :--))

Anthony Dewhirst commented on Can you hack this out?

Sun, 22 Nov 2009 22:27:17 GMT

Please Don't give the answer, maybe some hints so we can try to figure it out. (I might be the only fool asking for this though)

Alex Simkin commented on Can you hack this out?

Sun, 22 Nov 2009 22:15:14 GMT

@olcay şeker Apparently we didn't ask kindly enough.

olcay şeker commented on Can you hack this out?

Sun, 22 Nov 2009 13:44:11 GMT

@ayende will you unveil the answer???

Whut commented on Can you hack this out?

Sat, 21 Nov 2009 12:54:36 GMT

Using remoting, message sinks and some reflection hacks I'm able to run those lines: var runner = (IRunner)new T(); runner.Execute(); Still I can't crack this if(!typeof(IRunner).IsAssignableFrom(typeof(T))) But I will find it;)

Gian Maria commented on Can you hack this out?

Sat, 21 Nov 2009 07:57:30 GMT

I spent this morning 30 minutes thinking to a solution, it is really a thought question :). Ayende, it is somewhat related to creating a dynamic class with reflection.Emit and changing manually the TypeToken, setting with reflection the m_tdType field of the TypeBuilder? when the compositeRunner checks if T implements IRunner uses typeof(T) that in MSIL generates a call to GetTypeFromHandle using the TypeToken of T... Alk

Vadi commented on Can you hack this out?

Sat, 21 Nov 2009 07:35:05 GMT

I think, the story comes from here .. [gyrate.wordpress.com/.../context-bound-object-p...](http://gyrate.wordpress.com/2008/09/09/context-bound-object-part-ii/)

Mags commented on Can you hack this out?

Sat, 21 Nov 2009 07:21:40 GMT

Care to post the solution?

anon commented on Can you hack this out?

Sat, 21 Nov 2009 06:34:53 GMT

[msdn.microsoft.com/en-us/magazine/cc164165.aspx](http://msdn.microsoft.com/en-us/magazine/cc164165.aspx) Again, sorry for pollution, but I can't edit the comment previous.

anon commented on Can you hack this out?

Sat, 21 Nov 2009 06:32:45 GMT

Found 2 links about something like this. Sorry for polluting your comments section :) [stackoverflow.com/.../how-do-i-intercept-a-meth...](http://stackoverflow.com/questions/25803/how-do-i-intercept-a-method-call-in-c) [www.developerfusion.com/.../3/](http://www.developerfusion.com/article/5307/aspect-oriented-programming-using-net/3/)

anon commented on Can you hack this out?

Sat, 21 Nov 2009 06:27:43 GMT

No clue how :) But, can this somehow be used to provide a undo/redo facility that is transparent to the objects? Somehow catching the get/set of a property and also enhancing any property in a object with Undo() and Redo() methods?

Martinho Fernandes commented on Can you hack this out?

Sat, 21 Nov 2009 01:42:33 GMT

So, you're not gonna tell us?

Alex Simkin commented on Can you hack this out?

Fri, 20 Nov 2009 15:43:26 GMT

@Whut Transparent proxy is an object not a type. If you want its type, use GetType(), but I do not see what it gives you.

Whut commented on Can you hack this out?

Fri, 20 Nov 2009 15:32:51 GMT

I haven't done any remoting or COM, so I'm just fooling around. I'm trying to use proxy of Type class and using it as generic argument to CompositeRunner, but I can't just cast transparent proxy to Type;)

Alkampfer commented on Can you hack this out?

Fri, 20 Nov 2009 11:08:39 GMT

If you do not use another appDomain, probably a possibility is to inherit from Type, override the ISAssignableFrom(Type) method and return true, this fools the Runner and makes the following test pass if(!typeof(IRunner).IsAssignableFrom(typeof(T))) throw new InvalidOperationException("invalid type"); then maybe it is possible with reflection.emit, to create a new class, and use your custom Type as type, so when the runner call typeof(T) it gets your MyType that return true when it ask for IsAssignableFrom, and it gets fooled. But actually you still have another problem, because the IRunner is internal interface, and even with reflection Emit you cannot create a class that implements it, so you can make this class inherits from ContextBoundObject and use the standard IMessage AOP technique to intercept calls and redirect to a real AsseemblyRunner object, and now you can inject code before and after the call :) I wish to have some time to check this path and verify where it leads :) Alk.

SeeR commented on Can you hack this out?

Fri, 20 Nov 2009 10:05:31 GMT

Hmm. I'm guessing that now, you know also the way to mock static methoda with Rhino Mocks :-)

SeeR commented on Can you hack this out?

Fri, 20 Nov 2009 08:39:05 GMT

I remember your tweets about AppDomain.AssemblyResolve and hacking LINQ2SQL IProvider. The best was "how to override System.RuntimeType at runtime using Reflection.Emit " I guess this is it :-)

Dennis commented on Can you hack this out?

Fri, 20 Nov 2009 07:30:41 GMT

[http://netasm.codeplex.com/](http://netasm.codeplex.com/) Atleast similar

Dennis commented on Can you hack this out?

Fri, 20 Nov 2009 07:18:52 GMT

I saw an article the other day about hooking into the JIT and hijacking the jump table. But I cannot find the reference again :(