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• Recent resources on Entity Framework 4

  - by Eric Nelson

  I just posted on the bits you need to install to explore all the features of Entity Framework 4 with the Visual Studio 2010 RC. I’ve also had a quick look (March 12th 2010) to see what new resources are out there on EF4. They appear a little thin on the ground – but there are some gems. The following all caught my attention: Julie Lerman has published 2 How-to-videos on EF4 on pluralsight.com. You need to create a free guest pass to watch them. Getting Started with Entity Framework 4.0 – Session given at Cairo CodeCamp 2010 . This includes ppt and demos. Entity Framework 4 providers – read through the comments What’s new with Entity Framework in Visual Studio 2010 RC Extending the design surface of EF4 using the Extension Starter Kit Persistence Ignorance and EF4 on geekSpeak on channel 9 (poor audio IMHO – I gave up) First of a series of posts on EF4 How to stop your dba having a heart attack with EF4 from Simon Sabin in the UK. This includes ppt and demos. And the biggy. You no longer have to depend on SQL Profiler to keep an eye on the generated SQL. There is now a commercial profiler for Entity Framework.  I am yet to try it – but I listened to a .NET rocks podcast which made it sound great. It is “hidden” in a session on DSLs in Boo –> Oren Eini on creating DSLs in Boo. This is a much richer experience than you would get from SQL Profiler – matching the SQL to the .NET code. And finally a momentous #fail to … drum roll… the Visual Studio 2010 and .NET Framework 4 Training Kit Feb release. This just contains one ppt on EF4 – and it is not even a good one. Real shame. P.S. I will update the 101 EF4 Resources with the above … but post devweek in case I find some more goodies. Related Links 101 EF4 Resources

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• How to make 2 executables communicate in both directions in Windows

  - by user302099

  Hello. I have 2 Windows console applications, reading from standard input and writing to standard output. I'd like to assume I don't have the source code to any of them (actually I usually have the source code of one of them). I want to direct the standard output of one to the standard input of the other and vice versa, thus allowing communication (the goal is to allow two programs playing a certain game to play one against the other). How can this be done? I'm willing to do some C/C++ programming or anything else required. Oren.

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• Using Unit of Work design pattern / NHibernate Sessions in an MVVM WPF

  - by Echiban

  I think I am stuck in the paralysis of analysis. Please help! I currently have a project that Uses NHibernate on SQLite Implements Repository and Unit of Work pattern: http://blogs.hibernatingrhinos.com/nhibernate/archive/2008/04/10/nhibernate-and-the-unit-of-work-pattern.aspx MVVM strategy in a WPF app Unit of Work implementation in my case supports one NHibernate session at a time. I thought at the time that this makes sense; it hides inner workings of NHibernate session from ViewModel. Now, according to Oren Eini (Ayende): http://msdn.microsoft.com/en-us/magazine/ee819139.aspx He convinces the audience that NHibernate sessions should be created / disposed when the view associated with the presenter / viewmodel is disposed. He presents issues why you don't want one session per windows app, nor do you want a session to be created / disposed per transaction. This unfortunately poses a problem because my UI can easily have 10+ view/viewmodels present in an app. He is presenting using a MVP strategy, but does his advice translate to MVVM? Does this mean that I should scrap the unit of work and have viewmodel create NHibernate sessions directly? Should a WPF app only have one working session at a time? If that is true, when should I create / dispose a NHibernate session? And I still haven't considered how NHibernate Stateless sessions fit into all this! My brain is going to explode. Please help!

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• Is HttpContextWrapper all that....useful?

  - by bakasan

  I've been going through the process of cleaning up our controller code to make each action as testable. Generally speaking, this hasn't been too difficult--where we have opportunity to use a fixed object, like say FormsAuthentication, we generally introduce some form of wrapper as appropriate and be on our merry way. For reasons not particularly germaine to this conversation, when it came to dealing with usage of HttpContext, we decided to use the newly created HttpContextWrapper class rather than inventing something homegrown. One thing we did introduce was the ability to swap in a HttpContextWrapper (like say, for unit testing). This was wholly inspired by the way Oren Eini handles unit testing with DateTimes (see article, a pattern we also use) public static class FooHttpContext { public static Func<HttpContextWrapper> Current = () => new HttpContextWrapper(HttpContext.Current); public static void Reset() { Current = () => new HttpContextWrapper(HttpContext.Current); } } Nothing particularly fancy. And it works just fine in our controller code. The kicker came when we go to write unit tests. We're using Moq as our mocking framework, but alas var context = new Mock<HttpContextWrapper>() breaks since HttpContextWrapper doesn't have a parameterless ctor. And what does it take as a ctor parameter? A HttpContext object. So I find myself in a catch 22. I'm using the prescribed way to decouple HttpContext--but I can't mock a value in because the original HttpContext object was sealed and therefore difficult to test. I can map HttpContextBase, which both derive from--but that doesn't really get me what I'm after. Am I just missing the point somewhere with regard to HttpContextWrapper? I can find ways to work around the issue, but we are kind of fond of remaining consistent in decoupling using the Function delegate pattern--but it seems like we're not fully grokking intent of the wrapper.

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