How many times in your code do you need to parse strings to primitive values? I would guess pretty often. How often do you use
TryParse method, to avoid unnecessary exception handling? The same guess – probably pretty often. How many times did you wish that
TryParse didn’t use
out method parameter? Yes, the same answer again. But how many times did you think how to improve that scenario? Probably never. I think you should have done that! There is quite a lot of room for improvement here. Simple tricks that may make your parsing logic much simpler, cleaner and more verbatim.
In my previous post I wrote about solution-wide Rename Code Fix using Roslyn, which is supposed to analyze method declarations and suggest a fix when method marked with
async modifier does not have a name that ends with Async. The code I suggested works just fine, however there were some comments about improvements that can be made to make it work better. In this post I’m trying to address one of the suggestions, what results in seconds version of
Last time when I posted about Diagnostic with Code Fix using Microsoft .NET Compiler Platform, aka “Roslyn” the fix was completely local. This time, inspired by a tweet by Luke Sigler (@Schandlich) I decided to go for solution-wide rename.
I think everyone already knows that during //Build conference Anders Hejlsberg announced that Roslyn API (renamed to .NET Compiler Platform) is now an open source project (he actually clicked Public button live, on stage). It’s really a great news. But even though a lot of people think that main purpose of that move is to allow everyone to make his own version of C#, I don’t think that’s true. I think the main purpose of Roslyn project is still the same – to provide modern and open compiler infrastructure which will make extension development much easier, because extension code now knows exactly the same stuff compiler does. Because of that I decided to give it a try and write simple Diagnostic with Code Fix.
The release of new version of ASP.NET Identity – ASP.NET Identity 2.0.0 comes with new sample project, which shows how all the new features like email confirmation, password recovery and two-factor authentication can be used while creating web applications. However, the new sample follows an approach which sometime is not acceptable: it uses an email address as user name. In my case, I need these data to be separated, and that’s why I decided to modify sample project to allow that.
I’ve been working on a new feature for Visual F# Power Tools extension, which would creating and maintaining folder structure within F# projects. I have to admit, it was not a pleasure to dig into VS SDK and try to get it working. The most annoying part: part of SDK related to Solution Explorer still uses COM interfaces… Second most annoying part: Solution Explorer complaining about completely correct project structure…
But anyway. The more I dig into it, the more weird behaviors I experienced. And because I don’t think I’m the only one struggling with folders in F# projects – there are couple questions on StackOverflow about this (like here and here) – and because there is also a known workaround how to force VS to show folders in your project – just manually edit
.proj file – I decided to write about couple of problems you may run into trying to force F# project to contain folders.
I’ve been trying to learn F# for quite a long time now, but there was never a good way to do it. First of all, I need some way to evaluate my work. It’s really easy to learn new language, but you never know if you’re using it right. That’s even more likely to happen when not only language is new but also general idea behind that language is much different. That’s the case with my F# learning. Almost every programming language I’ve used so far can be classified as object-oriented-first language. F# is different. It’s functional-first language and because of that it’s more about learning how functional programming looks like, not how F# syntax looks like. But I think I found a way to learn F# right. And the answer is: Open Source.