How does BackgroundWorker work in C#?

How does BackgroundWorker work in C#?

Backgroundworker has three event handlers which basically takes care of everything one needs to make it work.

1. DoWork – Your actual background work goes in here.
2. ProgressChanged – When there is a progress in the background work.
3. RunWorkerCompleted – Gets called when background worker has completed the work.

How do I start a background worker?

To set up for a background operation, add an event handler for the DoWork event. Call your time-consuming operation in this event handler. To start the operation, call RunWorkerAsync. To receive notifications of progress updates, handle the ProgressChanged event.

How do I stop BackgroundWorker?

You will have to use a flag shared between the main thread and the BackgroundWorker, such as BackgroundWorker. CancellationPending . When you want the BackgroundWorker to exit, just set the flag using BackgroundWorker. CancelAsync().

What is worker thread C#?

A “worker thread” is just a thread which runs to perform some background work on the order of his boss(we can call it “client” ) and update work result to the client.

What is BackgroundWorker vb net?

BackgroundWorker handles long-running tasks. It does not freeze the entire program as this task executes. The BackgroundWorker type provides an excellent solution. It enables a simple multithreaded architecture for VB.NET programs. To begin, you will need a VB.NET Windows Forms project open.

What is a background thread C#?

Background threads are threads which will get terminated when all foreground threads are closed. The application won’t wait for them to be completed. We can create a background thread like following: Thread backgroundThread = new Thread(threadStart);

How do I stop DoWork BackgroundWorker?

The cancel button simply calls the CancelAsync() method – this will signal to the worker that the user would like to cancel the running process by setting the CancellationPending property to true, but that is all you can do from the UI thread – the rest will have to be done from inside the DoWork event.

What is difference between worker thread and main thread?

If an app is already running on a thread and a component is requested, the component will run on the existing thread for the app. Background or worker thread can be created within the app to run long running tasks. Main thread is also called UI thread as all UI components run on the main thread.

How to make thread-safe calls by using backgroundworker?

To make thread-safe calls by using BackgroundWorker Create a method to do the work that you want done in the background thread. Do not call controls created by the main thread in this method. Create a method to report the results of your background work after it finishes. You can call controls created by the main thread in this method.

How does the backgroundworker component work?

The BackgroundWorker component uses an event-driven model for multithreading. The background thread runs your DoWork event handler, and the thread that creates your controls runs your ProgressChanged and RunWorkerCompleted event handlers.

What is the difference between background thread and controls thread?

The background thread runs your DoWork event handler, and the thread that creates your controls runs your ProgressChanged and RunWorkerCompleted event handlers. You can call your controls from your ProgressChanged and RunWorkerCompleted event handlers.

How do I start the background thread of a form?

To start the background thread, call the RunWorkerAsync () method of the BackgroundWorker instance. In the following code example, the DoWork event handler uses Sleep to simulate work that takes some time. It does not call the form’s TextBox control.