Book Image

Microsoft .NET Framework 4.5 Quickstart Cookbook

By : Jose Luis Latorre
Book Image

Microsoft .NET Framework 4.5 Quickstart Cookbook

By: Jose Luis Latorre

Overview of this book

With about ten years since its first release, Microsoft's .NET Framework 4.5 is one of the most solid development technologies to create casual, business, or enterprise applications. It has evolved into a very stable framework and solid framework for developing applications, with a solid core, called the CLR (Common Language Runtime) Microsoft .NET Framework 4.5 includes massive changes and enables modern application and UI development."Microsoft .Net Framework 4.5 Quickstart Cookbook" aims to give you a run through the most exciting features of the latest version. You will experience all the flavors of .NET 4.5 hands on. The “How-to” recipes mix the right ingredients for a final taste of the most appetizing features and characteristics. The book is written in a way that enables you to dip in and out of the chapters.The book is full of practical code examples that are designed to clearly exemplify the different features and their applications in real-world development. All the chapters and recipes are progressive and based on the fresh features on .NET Framework 4.5.The book will begin by teaching you to build a modern UI application and improve it to make it Windows 8 Modern UI apps lifecycle model-compliant. You will create a portable library and throttle data source updating delays. Towards the end of the book, you will create you first Web API.
Table of Contents (19 chapters)
Microsoft .NET Framework 4.5 Quickstart Cookbook
About the Author
About the Reviewers

Using the WeakEvent pattern with WeakEventManager

Normal event handlers are defined using the += operator and the source keeps a reference to its listeners. If this reference is not removed, it prevents the listener from receiving garbage data. This is one of the most common causes of memory leaks, which are now much easier to avoid.

WPF 4.5 WeakEventManager provides us with a central event dispatching capability that allows the listeners to be de-allocated from memory, while the event is still alive.

While this is not a strictly new behavior, WPF 4.5 brings us enhanced support to set up a weak reference to an event. Prior to this version of WPF, we had to create a weak event manager for every event. This is not the case anymore. Now we can use a generic WeakEventManager for this; let's see how it works.

Getting ready

In order to use this recipe you should have Visual Studio 2012 installed.

How to do it...

Here we will implement some events with the WeakEventManager class.

  1. First, open Visual Studio...