Winforms Update Ui From Backgroundworker Progresschanged

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In a typical Windows Forms .NET application, the UI elements are created and updated by the main thread. This thread is also responsible for processing Windows messages. For this reason, it is recommended to keep message processing short and simple. Long running operations performed on this thread will cause incoming Windows messages to queue up. If messages don't get processed in a timely manner, the application will appear hung to the user and provide a poor user experience.

  1. C# Backgroundworker Reportprogress
  2. How To Update Ui From Service

For long running operations, you can offload the work to background threads. However, updating the UI elements from threads other than those that created them will result in an exception being thrown. This is because UI elements can only be updated from the threads that created them. Access to Windows Forms controls is not inherently thread safe. If you have two or more threads manipulating the state of a control, it is possible to force the control into an inconsistent state. Other thread-related bugs are possible, such as race conditions and deadlocks. It is important to make sure that access to your controls is performed in a thread-safe way. More Info

BackgroundWorker is used to execute Intensive tasks (time-consuming) in Separate Thread so the User Interface (UI) does not freeze. As the tasks are running in background and might take long time, it is necessary to show some custom messages and update the UI when the work is done. BackgroundWorker Component in WPF An overview of the BackgroundWorker component by JeremyBytes.com. Point, we can update our UI and do clean up (if required). So, let’s put our process into the background. To support this self-containment and communicate with the UI thread (to update the interface) the ProgressChanged event can be used. Finally, once the task called by the DoWork event has completed, the BackgroundWorker can fire another event, RunWorkerCompleted, to let the main program know the task has finished.

This poses a challenge if you want to update UI elements during those long running operations or as result of them. There are 2 ways to solve this challenge.

Guide to using BackgroundWorker in C#. To a slow server from your application and it blocks the UI thread. Can be created with the ProgressChanged event. Edit: As another user posted, if yo you can wait to the BackgroundWorker.Completed event to update your UI then you can subscribe to that event and call your UI code directly. BackgroundWorker_Completed is called on the main app thread. My code assumes you want to do updates during the operation.

C# Backgroundworker Reportprogress

  1. Control.BeginInvoke - MSDN - This allows you to run a specified delegate asynchronously on the thread that created the control.
  2. BackgroundWorker - MSDN - The BackgroundWorker class allows you to run an operation on a separate, dedicated thread.

The ProgressChanged and RunWorkerCompleted events, on the other hand, are executed on the same thread as the BackgroundWorker is created on, which will usually be the main/UI thread and therefore you are allowed to update the UI from them. Therefore, the only communication that can be performed between your running background task and the UI is. Raises the ProgressChanged. // Be sure not to manipulate any Windows Forms controls created // on the UI thread from this method.

How To Update Ui From Service

You can force updates to UI elements from other threads using PInvokeThread UnSafe methods. These are usually not recommended since the alternative is well established and easy to implement.

Here is a link to the code that shows how to implement either approach. Link on GitHub

Hopefully the two approaches described above will help you implement the correct pattern and update UI elements without any issues.