In this article, I am going to discuss the Fluent Interface Design Pattern in C# with examples. Fluent Builder Pattern vs Constructor. But, it makes for a really awesome API for the user. The main idea behind is that an object does not have to be responsible for its own creation. C++ Builder Pattern with Fluent API Example. 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. 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. Step 3: Create a fluent API. That would probably be an Expression Builder then. Fluent Builder. If you want a much more thought out example of a fluent API take a look at JMock. 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. Fluent Interface Design Pattern in C# with Examples. Let us also consider that you don't want to be able to call any method more than once. JMock, like any mocking library, needs to create complex specifications of behavior. ... Browse other questions tagged c# design-patterns builder fluent-interface method-chaining or ask your own question. The Fluent Interface Design Pattern falls under the category of the Creational Design Pattern. However, we can still improve on the pattern. Tuesday, October 2, 2018. There have been many mocking libraries built over the last few years, JMock's contains a very nice fluent API which flows very nicely. When people first discover GOF design patterns, they either reject them or are eager to rewrite their code base to … Fluent Interface pattern provides easily readable flowing interface to code. Good fluent APIs take a while to build. By: Chris Dunn. Wikipedia says. Design patterns are important when developing applications. You can certainly put a Fluent Interface on top of a Director/Builder pattern to make it read more – well – fluently and to emphasize the domain concepts (vs. the technical process of building and delegating). The HasRequired and HasOptional methods take a lambda expression that represents a reference navigation property. 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. In order to make our client code a bit more concise, we can implement a fluent API. In this video we will discuss and implement 1. In software engineering, a fluent interface is an object-oriented API whose design relies extensively on method chaining. Let us consider that you have 3 methods, A, B, and C, and you want to use them in a chain. Fluent Interface2. Its goal is to increase code legibility by creating a domain-specific language (DSL). Please read our previous article where we discussed the Builder Design Pattern in C# with examples. There are other ways of implementation of the fluent interface pattern, for example using nested class. The Builder Pattern decouples the creation of the object from the object itself. Generally, properties feel more “readable”, particularly to the non-technical crowd, but properties cannot receive parameters. Enhance the Builder Implementation with Fluent Implementation3. 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