BackgroundWorker Class sample for Beginners. Download source - 27.27 KB Introduction This article presents a novice .NET developer to develop a multithreading application without being burdened by the complexity that comes with threading.
Background A basic Windows application runs on a single thread usually referred to as UI thread. This UI thread is responsible for creating/painting all the controls and upon which the code execution takes place. Using the Code What you need to do is to shift this heavy processing on a different thread. Leave the UI thread free for painting the UI. .NET has made the BackgroundWorker object available to us to simplify threading. The steps are extremely simple: Create a BackgroundWorker object. BackgroundWorker uses the thread-pool, which recycles threads to avoid recreating them for each new task. And a golden rule never to forget: Never access UI objects on a thread that didn't create them. LblStatus.Text = "Processing file...20%"; ...in the DoWork function.
To add support for progress reporting: 1. 2. Elegant Code WPF Multithreading: Using the BackgroundWorker and Reporting the Progress to the UI. I can’t count the number of times someone has asked me about running a time consuming task on a separate thread, but at the same time show a progress dialog with up-to-the-second percentage updates being displayed to the user.
Multithreading can be confusing at first, but if you just take it one step at a time, it really isn’t all that bad. I am going to show you how to create a multithreaded application that shows a progress dialog which shows real time progress to the user. First lets start with how to get started with multithreading in WPF. If you don’t want to read how this actually works and just want to get the source and start playing ,here is the Source Code.
Your WPF application may need to perform intensive tasks that consume large amounts of time. Running a Background Process The RunWorkerAsync method starts the execution of the background process by raising the DoWork event. Int maxRecords = 1000; BackgroundWorker worker = new BackgroundWorker(); worker.RunWorkerAsync(); return; BackgroundWorker Threads and Supporting Cancel. Introduction This article is for novice and amateur developers who recognize areas of their application that could use threading but don't want to be burdened with some of the complexity that comes with threading.
Threading is a concept that many programmers tend to avoid because it can be difficult to understand, debug and implement. You can develop a very sophisticated multi-threaded application using C#. Don't worry, the BackgroundWorker object makes threading easy to use even if you don't want to take the time to understand everything about threading. Using the Code When your application loads, it runs on a single thread. What you need to do is this heavy processing on a different thread.
There is one rule you need to be aware of - you can't access UI objects on a thread that didn't create them. Synchronous Example There are two examples in this article, one on synchronous threading and the other on asynchronous threading. Asynchronous Example Points of Interest Check out my other posts: