Życzenia Świąteczne / Merry Christmas 2016

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

Kolejny rok minął jak z bicza strzelił. Dużo się w nim działo, a w 2016 przynajmniej u mnie będzie się działo jeszcze więcej i z pewnością będzie ciekawie. Zanim to jednak nastąpi czekają nas Święta Bożego Narodzenia, czas odpoczynku, spotkań w rodzinnym gronie... i z tej okazji życzę Wam i Waszym bliskim wszystkiego dobrego.

Wszystkiego dobrego,
Michał Komorowski

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Another year passed like a whip shot. Much has happened in 2015 but even more is going to happen in 2016, at least in my case;) But it is still the future and now Christmas is right around the corner. It is a time of rest, meetings with the family... and on this occasion I wish You and Your relatives all the best.

Best wishes,
Michał Komorowski

Murphy's law in practice

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The photo comes from MSI website

You must have heard about Murphy's law saying that Anything that can go wrong, will go wrong. We can also add ...at the least expected moment or ...at the worst possible time. Some time ago I had quite a busy evening i.e. I had to write some urgent e-mails etc. Everything was ok until suddenly my computer (MSI GE60 2OE, Windows 10) went crazy.

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Did you know that about HTTP?

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Titile: Chapel of the Emerald Buddha in Bangkok, Source: own resources, Authors: Agnieszka and Michał Komorowscy

Recently, when answering a question on stackoverflow.com, I've learned an interesting thing about HTTP protocol. Actually currently it seems to be obvious to me ;) What I'm talking about? Well, initially I thought that if you send GET HTTP request in order to download a specific URL, then in a response you will get an entire page/file. In other words I thought that it's not possible to read the specific part of a page/file. However, it turned out that it's quite easy.

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You will love it

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A screenshot comes from ShareLaTeX web site

Sometime ago I wrote that I was amazed when I found out that Nuget supports C++. Today, I was amazed even more, when I discovered ShareLaTeX web site. This site is simply great and I don't know how I've been living without it for such a long time.

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Nuget in C++ rulez

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

I haven't been programming in C++ for a very long time and I didn't expect that I would do it professionally in the foreseeable future. However, the life has different plans ;) Recently, I've joined an extremely interesting project in the area of the computer vision. In a while I'll try to write something about it.

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How to validate dynamic UI with JQuery?

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

One of the most interesting task I developed some time ago was a library responsible for the generation of dynamic UI based on XML description in ASP.NET MVC application. The task was not trivial. The UI had to change based on the selections made by a user. I had to support many different types of controls, relations between them e.g. if we select the checkbox A then the text box B should be disabled and of course validations. In order to perform the client side validations I used jQuery Unobtrusive Validation library. I thought that it'll work just like that but it turned out that a dynamic UI may cause problems. Here is what I did.

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3 reasons why I don't use strict mocks

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

The majority, if not all, of mocking frameworks provides 2 types of mocks i.e. strict & loose. The difference between them is that the strict mocks will throw an exception if an unexpected (not configured /set up) method was called. I prefer to use loose mocks because with strict ones unit tests are fragile. Even the small change in the code can cause that unit tests will start failing. Secondly, if you need to set up many methods a test becomes less readable. Now, I can see one more reason.

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Roslyn - How to create a custom debuggable scripting language 2?

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A screenshot comes from Visual Studio 2015

In the previous post I explained how to create a simple debuggable scripting language based on Roslyn compiler as a service. By debuggable I mean that it can be debugged in Visual Studio as any "normal" program for example written in C#.

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Roslyn - How to create a custom debuggable scripting language?

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A screenshot comes from Visual Studio 2015

Sometime ago I decided to play a little bit with Cakebuild. It's a build automation tool/system that allows you to write build scripts using C# domain specific language. What's more it is possible to debug these scripts in Visual Studio. It is interesting because Cake scripts are neither "normal" C# files nor are added to projects (csproj). I was curious how it was achieved and it is result of my analysis. I'll tell you how to create a simple debuggable scripting language. By debuggable I mean that it'll be possible to debug scripts in our language in Visual Studio almost as any "normal" program in C#. Cakebuild uses Roslyn i.e. a compiler as a service from Microsft and we'll do the same.

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.NET Developer Days 2016 - Grand finale

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The time has come to summary .NET Developer Days 2016. I think that each conference can be judged based on 3 main factors: organisation, presentations, networking so I'll write a few words about each of these topics.

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Do not forget about GO

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

Almost 4 years ago, I wrote a short post in Polish about problems that may occur if we forget about GO keyword in our scripts. I decided to write this post again, this time in English, because recently I helped to fixed exactly the same problem again. As a remainder, GO keyword instructs tools like SQL Management Studio, sqlcmd... to send the batch of T-SQL code to the server. Now, let's look at the following code that creates a stored procedure and tell me what is wrong here:

CREATE PROCEDURE dbo.pr_Fun
AS
BEGIN
    /*...*/
    RETURN
END

GRANT EXECUTE ON dbo.pr_Fun TO public
GO

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Report from the battlefield #6 - Auto-Property Initializers + a non-binary serialization

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Source: own resources, Authors: Agnieszka and Michał Komorowscy

I can bet that you've already heard about and used Auto-Property Initializers and that you love them. At least I do so ;) Here is a small example. In this case an Auto-Property Initializer was used to generate unique identifiers for instances of Entity class. Trivial, isn't it?

public class Entity
{
   public string Guid { get; } = System.Guid.NewGuid().ToString();
   /*...*/
}

What is important we have guaranteed that a given initializer will be executed only ONCE for an instance of a class. Otherwise it will have no sense! In other words our expectations is that if we create a new instance of Entity class it's identifier will not change. It is generally true, but there are some caveats.

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.NET Developer Days 2016 - Workshops

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In my previous post about .NET Developer Days 2016 I wrote generally about the conference and about presentations I'd like to see. This time I want to drop a few lines about pre-conference workshops (sessions). They will take place just a day before the actual conference (GoldenFloor, Millenium Plaza – Warsaw, Al. Jerozolimskie 123 a) and you could choose from:

• Dino Esposito - Modern Web Development with the ASP.NET MVC Stack
• Ted Neward - Busy .NET Developer’s Workshopon the CLR
• Adam Granicz - Functional Programming on .NET with F# – Become a Programming Jedi Now!
• Daniel Fisher - Resilience and cloud patterns TOGO: build useful stuff in JS and C#

The links above will lead you to the description of each session. However, I have a surprise for you. I contacted with experts who will conduct workshops and asked them a few questions. Here are additional information that I got. You'll not find them anywhere else.

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