In a previous article, we refactored a unit test in two ways. The builder and fixture patterns encapsulated an object’s creation, which simplified the arrange phase of a unit test. These two patterns produced a lot of boiler-plate code. It would be nice to never have to create an arrange phase in the first place. AutoFixture tries to produce unit tests with no arrange phase. As the AutoFixture GitHub page describes:...
In a previous post, I dived into view results, and how the razor view engine executes a razor view. Part of the post discussed a feature called view location expanders. An expander does what its name describes. It expands on locating a view within your application, that is, a way to change how your .cshtml files are located. View Localisation A good example of a view location expander, is the built-in LanguageViewLocationExpander....
The New MSBuild MSBuild is the build engine for .NET and Visual Studio. It is written in such a way to be composable, allowing you to combine project files. If you have ever used Visual Studio, then you have indirectly used MSBuild. When you open Visual Studio, it is using MSBuild to restore, build, and manage your projects. Recently, a new version of MSBuild has hit the streets. This came out along with Visual Studio 2017, and has changed design....
In This Series ASP.NET Core MVC - Repository Overview: Model Binding ASP.NET MVC Core - Repository Overview: Value Providers ASP.NET Core 2.0 - Repository Overview: Action Discovery ASP.NET Core 2.0 - Repository Overview: Action Selection ASP.NET Core 2.0 - Repository Overview: Razor Pages ASP.NET Core 2.0 - Repository Overview: Action Results Contents Introduction What is the View Result Returning a view result Executing a view result The Executor Finding and Compiling your View View Location Expanders View Locator Cache Generating an IRazorView Cache Invalidation Rendering the Razor Page Creating a Custom Action Result Summary Introduction This series tries to explain the underlying mechanisms of ASP....
Over the past 20 years, testing has become a cornerstone of software development. To turn software development into a true profession, we need to create robust, secure, safe, and efficient systems. The simplest tool in our toolbox starts us on this road: the unit test. Like an accountant, the unit test is a fantastic way for us to perform double-entry bookkeeping. The unit test double checks our work is correct, and makes sure we keep it from morphing into something we did not want....
Programmers are lazy. We love tools that automate our lives. Why not automate data? A time-consuming but necessary part of a programmers job is seeding data into a database. Demonstrations, load performance, styling, testing, all need a way to generate data. A rudimentary way of doing this is by hand. Spending days, sometimes weeks, inputting data into a system until it represents a realistic go-live scenario. Once you begin to realise doing it by hand is inefficient, you decide to create a seeding application that does it for you....
Previously in this Series ASP.NET Core MVC - Repository Overview: Model Binding ASP.NET MVC Core - Repository Overview: Value Providers ASP.NET Core 2.0 - Repository Overview: Action Discovery ASP.NET Core 2.0 - Repository Overview: Action Selection Contents Introduction What is Razor Pages? How to setup Razor Pages Creating your first Razor Page The RazorProjectPageRouteModelProvider Class Razor Pages and Forms The code-behind file The Razor Page Application Model Dealing with Multiple Handlers Getting rid of the handler query parameter Summary Introduction This article is the fifth in a series I’m dedicating to reviewing the code and design of the ASP....
Previously in this Series ASP.NET Core MVC - Repository Overview: Model Binding ASP.NET MVC Core - Repository Overview: Value Providers ASP.NET Core 2.0 - Repository Overview: Action Discovery Contents Introduction The ActionSelector Class Dependencies The Route Value Cache Conventional Routing A Note on Cache Efficiency Attribute Routing Attribute Routing with Route Templates Selecting the Best Candidate Evaluating the Constraints Summary Introduction This article is the fourth in a series I’m dedicating to reviewing the code and design of the ASP....
Previously in this Series ASP.NET Core MVC - Repository Overview: Model Binding ASP.NET MVC Core - Repository Overview: Value Providers Contents Introduction Registering Actions Finding Controller Actions The Controller Feature Provider The Default Application Model Provider Customising Controller Action Discovery Finding Razor Pages The Razor Project PageRouteModel Provider The Compiled PageRouteModel Provider Razor Pages Route Template Summary Introduction This article is the third in a series I’m dedicating to reviewing the code and design of the ASP....
In the current age of microservices, we have communication between different processes across a wide variety of hosts and platforms. At other times, we integrate with 3rd party libraries, downloading information and metadata that may be necessary for our current application. On some of those occasions, we need to interact with a REST API. Wouldn’t it be nice if when interacting with REST APIs, we could allow the compiler to help us out?...
Value providers are part of the model binding ecosystem, and so if you want a more general overview, please see the first post within this series. Contents Introduction What is a value provider? How it all works MvcOptions Value Provider Factories The Controller Context The Composite Value Provider Binding Sources Why? Creating your own Value Provider Summary Introduction This is the second installment of blog posts that I will be sharing over the coming weeks that discuss the ASP....
I think that the best way to learn how to code, is to read code. That is why I think the number one tool out there for an aspiring developer is GitHub. When I found out that the ASP.NET Core team at Microsoft were going to open source their platforms, I was ecstatic. Not just because of the open source movement, but because it would be my chance to learn the techniques used at Microsoft, and how they provide such a wonderful framework to work in....
This post will describe how to share controllers and views across ASP.NET Core applications, shared via an ASP.NET Core library. Best practices within the model-view-controller (MVC) world dictate that we should keep our controllers as thin as possible. Controllers should be extracted away from business logic, operational logic, and any sort of decision making. The only real thing controllers should be doing, are acting as a bridge. A bridge from the http world, to the domain logic of an application....
Why is the single responsibility principle (SRP) so hard to define? From my experience, SRP stumbles people much more than any other SOLID principle. I thought back to my own struggles with the five principles, and thought it would be better to explain SOLID in a different way; or rather, a different order. What is an interface? a point where two systems, subjects, organizations, etc. meet and interact. When A wants to interact with B, A will communicate through interface C, for which A and B mutually understands....
The configuration API in ASP.NET core is now a first-class citizen. It is now easier than ever to configure applications within a .NET application. If you visit the main documentation page Configuration in ASP.NET Core it will give you detailed instructions on how to use it. One part of the documentation discusses the IOptions snapshot. This allows you to take a configuration file - typically json - and automatically deserialise it into a plain old CLR object (POCO)....