![]() ![]() They are meant to be data containers for your MVC Views. Why? Because ViewModels are attached to the UI. But if you notice in our project, we just have a Models folder so we can copy that over as well, BUT KEEP THE ViewModels in the ThinController project under the Models directory. The GeneratedClasses folder is from our Entity Framework generating our classes for us from this post. We will move our GeneratedClasses and Classes and/or Models folder into this BusinessLayer project. If you are using it in your application, there will be a class for it. Your business layer will contain the logic as to whether fields are required, is there a range of numbers that a property can accept, whether shipping is allowed based on an address, etc. Let's create a new Class Project and call this project BusinessLayer. This is the layer that tells us what we can and can't do with the application. ![]() Business Layerįirst, we need the core of our "onion." This is the Business Layer and contains all of the business logic for our entities. Let's refactor the application and discuss the layers as we go. It isn't a layer in the onion architecture. This is considered to be our "Big Ball Of Mud." Even if we tried, we couldn't use our models in any other application. As you can see, the application isn't broken into any parts. It has been updated since because of more recent articles. After reading additional material, I started to realize that if you logically partition your application into modules, you start making reusable components for future applications instead of re-inventing the wheel.ĪLWAYS Leverage Your Existing Code! OverviewĪs always, I will be using our standard FaqController project that we used a while back located here. I read it numerous times and realized that this was the way real applications were built. I finally came across a paper from Scott Ambler of Ambysoft titled "The Design Of A Robust Persistence Layer for Relational Databases" ( PDF). ![]() Outside the company, I decided to further my knowledge of coding and do some research on how to build applications properly. A brief historyīack in 1997-ish, I was writing software for an insurance company and thought that there had to be more to it than just banging at the keyboard making applications. This post will not only show you how your finished solution should look, but I will take you step-by-step through the refactoring of an existing application into reusable components. Do you combine all of your code into one assembly or do you make everything so granular that it's easy to include in other projects?ĭo you create the proverbial " big ball of mud" (don't laugh.I've seen professional consultants do this) or do you make your system easily approachable and easy to read.WITHOUT documentation? Recently, I had a reader ask me about how do I layout my projects when building websites. ![]()
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