Langjährige Erfahrungen bei der Entwicklung von .NET-Anwendungen und dem Betrieb … Managed Extensibility Framework – Why they built it. Active 11 years, 7 months ago. V1 in .NET Framework 4.0 Die nachfolgenden Abschnitte zeigen, welche neuen Möglichkeiten diese Version mit sich bringt. MEF allows applications to discover and examine parts by their metadata, without instantiating them or even loading their assemblies. Many of the applications that would benefit most from the power of MEF are more complex than SimpleCalculator. This makes communication among parts not only possible, but easy, and allows for good factoring of code. Imagine that you are the architect of a large application that must provide support for extensibility. The simplest way to see what MEF can do is to build a simple MEF application. Compile and run the project. It also aims to let extension developers encapsulate code easily and avoid fragile hard dependencies. Managed Extensibility Framework (MEF) is a component of .NET Framework 4.0 aiming to create lightweight, extensible applications. If more than one is available, the composition engine produces an error. Beratung Managed Extensibility Framework. What is important to note is why they created one … MEF aims to provide a standard way for the host application to expose itself and consume external extensions. Über das Attribut Export stellt eine Klasse eine Funktionalität zur Verfügung. To complete the calculator, you also need a helper method that returns the position of the first non-digit character in a string. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. The MEF platform enables the development of lightweight, extensible .Net applications. If the Add class declared a further import, that too would have to be filled, and so on. This solves the problem of requiring source code access, but it still has its own difficulties. You explicitly composed the Program object, which imported an ICalculator that turned out to be of type MySimpleCalculator. The Managed Extensibility Framework or MEF is a library for creating lightweight, extensible applications. Mithilfe des Managed Extensibility Frameworks lassen sich aus einzelnen Komponenten flexibel Anwendungen zusammenstellen. Add this very simple interface to the module or SimpleCalculator namespace: Now that you have defined ICalculator, you need a class that implements it. This time the focus is on metadata and creation policies. The user interface layer (Program) does not need to know anything else. Your application has to include a potentially large number of smaller components, and is responsible for creating and running them. It also aims to let extension developers encapsulate code easily and avoid fragile hard dependencies. If the application architect has not anticipated the need for a particular communication, it is usually impossible. In this article I will be writing about Managed Extensibility Framework (MEF) along with a demo application using Windows Presentation Foundation (WPF). .net documentation: Managed Extensibility Framework. It's a light-weight framework to build a plugin solution. The Managed Extensibility Framework (or MEF for short) simplifies the creation of extensible applications. Sign up. I suppose most answers would be 'no'. System.web.extensions reference dll is missing from the 2.0 framework .net references in VS2010? MEF not only allows extensions to be reused within applications, but across applications as well. Add the following code to the Program class: Notice that the declaration of the calculator object is not unusual, but that it is decorated with the ImportAttribute attribute. The Managed Extensibility Framework (MEF) from Microsoft is a framework that allows developers to create a plug-in based application that allows for designing extensible programs by either the developer or third parties. Since I have started following conversations and blog posts on MEF, I have seen lots of talk about how it compares to other extensibility options like the ones described in this blog post (i.e. Any export declared with a matching contract will fulfill this import. To have access to composable parts take advantage of both value, up to including. Plugin model needs to create lightweight, extensible applications application developer discover and use extensions without any requirement. That uses MEF to dynamically load assemblies Framework and it finds its applicability in any in! Extensible application imported an ICalculator that turned out to be reused across applications as well as.... 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