Monthly Archives: September 2015

Using Roslyn and unit tests to enforce coding guidelines and more

Last year, during a few of my Roslyn talks, I was presenting a cool idea of leveraging Roslyn in unit tests to enforce a certain style in code, and in general inspect the consistency of the code in various ways.

It’s a really powerful concept, and something I wanted to blog about, but of course forgot – until I was reminded of that yesterday on Twitter.

Let’s have a look.

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Running a C# REPL in a DNX application with scriptcs

One of the cool things that scriptcs allows you to do, is that you can embed it into your application and allow execution of C# scripts. There are even some great resources on that out there, like this awesome post by Mads.

The same applies to the REPL functionality – you don’t have to use scriptcs.exe to access the REPL – you can use the scriptcs Nuget packages to create a REPL inside your app.

And because there aren’t that many resources (if any) on how to host a scriptcs REPL, today I wanted to show you just that. But for a more interesting twist, we’ll do that inside a DNX application.

There are many reasons why DNX is awesome, and why you’d want to use it, but especially because, through the project.json project system, it has a much improved way of referencing and loading dependencies and Nuget packages – and we can leverage that mechanism to feed assemblies into our REPL.

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Hacking DNX to run C# scripts

Because of my considerable community involvement in promoting C# scripting (i.e. here or here), I thought the other day, why not attempt to run C# scripts using DNX?

While out of the box, DNX only compiles proper, traditional C# only, thanks to the compilation hooks it exposes, it is possible to intercept the compilation object prior to it being actually emitted, which allows you to do just about anything – including run C# scripts.

Let’s explore more.

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