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