Union types in C# - boustrophedonic. This post shows how to easily implement states in C# using a T4 template.
Background I often run into situations where I need an object that has a number of alternate “states” or “choices”. The set of states must be treated as “one thing” for general manipulation, but on the other hand, each state will often have slightly different behavior from the other states. Some examples: A shopping cart might have states Empty, Active and Paid. So given this common situation, what kinds of ways are there to implement these kinds of cases? The inheritance based approach The standard approach in a object-oriented language is to use inheritance. But where should the custom behavior live? For example, in the shopping cart example, should the “RemoveItem” method be available at the interface level? Approach 1: Define all possible actions at the interface level Let’s say the “RemoveItem” method is available at the interface level, then the interface would look like this: Here’s some code to show what I mean:
Nuget. Debug. Json.Net. .NET samples. Git. IoC, Dependency Injection. XML. Nuget. Portable Class Libraries. Windows Forms. IPC. .NET Reference Source. Cocoa. MvvmCross. Xamarin. Git. Mono. Security. Data. XML. .NET blogs. .NET Framework. Immutability. MEF. Visual Studio Extensions. Web. Transactions. Regular expressions. T4. .NET. Eric Lippert. Expression trees. Security. DLR. WPF, MVVM. Web. Libraries. Learn C#, WPF, Visual Studio 2012, Windows 8, TypeScript, HTML 5, Windows Phone 8, ASP.NET, WCF. The Joel Test: 12 Steps to Better Code. By Joel Spolsky Wednesday, August 09, 2000 Have you ever heard of SEMA?
It's a fairly esoteric system for measuring how good a software team is. No, wait! Don't follow that link! The neat thing about The Joel Test is that it's easy to get a quick yes or no to each question. A score of 12 is perfect, 11 is tolerable, but 10 or lower and you've got serious problems. Of course, these are not the only factors that determine success or failure: in particular, if you have a great software team working on a product that nobody wants, well, people aren't going to want it. 1. 2. If the process takes any more than one step, it is prone to errors. For this very reason, the last company I worked at switched from WISE to InstallShield: we required that the installation process be able to run, from a script, automatically, overnight, using the NT scheduler, and WISE couldn't run from the scheduler overnight, so we threw it out. 3. 4.
Bug databases can be complicated or simple. 5. 6.
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