The HasRequired and HasOptional methods take a lambda expression that represents a reference navigation property. 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 main idea behind is that an object does not have to be responsible for its own creation. Fluent Builder Pattern vs Constructor. Enhance the Builder Implementation with Fluent Implementation3. 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. Fluent Interface Design Pattern in C# with Examples. Good fluent APIs take a while to build. Let us consider that you have 3 methods, A, B, and C, and you want to use them in a chain. JMock, like any mocking library, needs to create complex specifications of behavior. C++ Builder Pattern with Fluent API Example. Tuesday, October 2, 2018. Design patterns are important when developing applications. That would probably be an Expression Builder then. By: Chris Dunn. The Builder Pattern decouples the creation of the object from the object itself. The Fluent Interface Design Pattern falls under the category of the Creational Design Pattern. In software engineering, a fluent interface is an object-oriented API whose design relies extensively on method chaining. Please read our previous article where we discussed the Builder Design Pattern in C# with examples. Fluent Interface pattern provides easily readable flowing interface to code. When people first discover GOF design patterns, they either reject them or are eager to rewrite their code base to … If you want a much more thought out example of a fluent API take a look at JMock. In this article, I am going to discuss the Fluent Interface Design Pattern in C# with examples. However, we can still improve on the pattern. Wikipedia says. Step 3: Create a fluent API. Generally, properties feel more “readable”, particularly to the non-technical crowd, but properties cannot receive parameters. 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). 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 Interface2. There have been many mocking libraries built over the last few years, JMock's contains a very nice fluent API which flows very nicely. Fluent Builder. 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. 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