Fluent Builder. But, it makes for a really awesome API for the user. By: Chris Dunn. Fluent Interface pattern provides easily readable flowing interface to code. In software engineering, a fluent interface is an object-oriented API whose design relies extensively on method chaining. I’d like to stress that Fluent Interfaces are not just Method Chaining. In the event that we seek to construct a Fluent API in C# for a Builder, the first decision will be whether to use property syntax or method-call syntax to describe the “steps” in the Fluent API. When configuring a relationship with the fluent API, you start with the EntityTypeConfiguration instance and then use the HasRequired, HasOptional, or HasMany method to specify the type of relationship this entity participates in. The following two steps are optional, but since they don’t require a lot of work I would recommend implementing them as well since it vastly improves the expressiveness of your tests. The main idea behind is that an object does not have to be responsible for its own creation. There are other ways of implementation of the fluent interface pattern, for example using nested class. Wikipedia says. C++ Builder Pattern with Fluent API Example. Its goal is to increase code legibility by creating a domain-specific language (DSL). That would probably be an Expression Builder then. The Builder Pattern decouples the creation of the object from the object itself. JMock, like any mocking library, needs to create complex specifications of behavior. When people first discover GOF design patterns, they either reject them or are eager to rewrite their code base to … Fluent Interface Design Pattern in C# with Examples. Generally, properties feel more “readable”, particularly to the non-technical crowd, but properties cannot receive parameters. However, we can still improve on the pattern. The HasRequired and HasOptional methods take a lambda expression that represents a reference navigation property. Fluent Builder Pattern vs Constructor. Tuesday, October 2, 2018. Let us consider that you have 3 methods, A, B, and C, and you want to use them in a chain. Builder pattern and fluent interface pattern in various scenarios can not only simplify and make more intuitive API usages but also simplify its validation logic. Please read our previous article where we discussed the Builder Design Pattern in C# with examples. There have been many mocking libraries built over the last few years, JMock's contains a very nice fluent API which flows very nicely. In this video we will discuss and implement 1. Enhance the Builder Implementation with Fluent Implementation3. Good fluent APIs take a while to build. Step 3: Create a fluent API. 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