How to use WPF Background Worker

Question

In my application I need to perform a series of initialization steps  these take 7-8 seconds to complete during which my UI becomes unresponsive  To resolve this I perform the initialization in a separate thread   public void Initialization         Thread initThread   new Thread new ThreadStart InitializationThread        initThread Start       public void InitializationThread         outputMessage  Initializing             DO INITIALIZATION     outputMessage  Initialization Complete        I have read a few articles about the BackgroundWorker and how it should allow me to keep my application responsive without ever having to write a thread to perform lengthy tasks but I haven t had any success trying to implement it  could anyone tell how I would do this using the BackgroundWorker

User · Answer

using System    using System ComponentModel     using System Threading      namespace BackGroundWorkerExample            class Program                   private static BackgroundWorker backgroundWorker             static void Main string   args                            backgroundWorker   new BackgroundWorker                                   WorkerReportsProgress   true                    WorkerSupportsCancellation   true                                 backgroundWorker DoWork    backgroundWorker DoWork                  For the display of operation progress to UI                  backgroundWorker ProgressChanged    backgroundWorker ProgressChanged                  After the completation of operation                  backgroundWorker RunWorkerCompleted    backgroundWorker RunWorkerCompleted                backgroundWorker RunWorkerAsync  Press Enter in the next 5 seconds to Cancel operation                    Console ReadLine                   if  backgroundWorker IsBusy                                   backgroundWorker CancelAsync                      Console ReadLine                                           static void backgroundWorker DoWork object sender  DoWorkEventArgs e                            for  int i   0  i  lt  200  i                                      if  backgroundWorker CancellationPending                                            e Cancel   true                        return                                         backgroundWorker ReportProgress i                     Thread Sleep 1000                     e Result   1000                                         static void backgroundWorker ProgressChanged object sender  ProgressChangedEventArgs e                            Console WriteLine  Completed    e ProgressPercentage                                static void backgroundWorker RunWorkerCompleted object sender  RunWorkerCompletedEventArgs e                             if  e Cancelled                                    Console WriteLine  Operation Cancelled                                  else if  e Error    null                                    Console WriteLine  Error in Process      e Error                                 else                                   Console WriteLine  Operation Completed      e Result                                              Also  referr the below link you will understand the concepts of Background   http   www c-sharpcorner com UploadFile 1c8574 threads-in-wpf

User · Answer

Add using   using System ComponentModel     Declare Background Worker    private readonly BackgroundWorker worker   new BackgroundWorker       Subscribe to events    worker DoWork    worker DoWork  worker RunWorkerCompleted    worker RunWorkerCompleted     Implement two methods    private void worker DoWork object sender  DoWorkEventArgs e         run all background tasks here    private void worker RunWorkerCompleted object sender                                              RunWorkerCompletedEventArgs e        update ui once worker complete his work      Run worker async whenever your need    worker RunWorkerAsync       Track progress  optional  but often useful    a  subscribe to ProgressChanged event and use ReportProgress Int32  in DoWork  b  set worker WorkerReportsProgress   true   credits to  zagy

User · Answer

I found this  WPF Multithreading  Using the BackgroundWorker and Reporting the Progress to the UI  link  to contain the rest of the details which are missing from  Andrew s answer   The one thing I found very useful was that the worker thread couldn t access the MainWindow s controls  in it s own method   however when using a delegate inside the main windows event handler it was possible   worker RunWorkerCompleted    delegate object s  RunWorkerCompletedEventArgs args        pd Close           Get a result from the asynchronous worker     T t    t args Result     this ExampleControl Text   t BlaBla

User · Answer

You may want to also look into using Task instead of background workers    The easiest way to do this is in your example is Task Run InitializationThread      There are several benefits to using tasks instead of background workers  For example  the new async await features in  net 4 5 use Task for threading  Here is some documentation about Task https   docs microsoft com en-us dotnet api system threading tasks task

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