CODEWITHSUNDEEP
c#multithreadingwinforms
user2813889
user2813889

Reputation: 71

Communicate between BackgroundWorker and main thread

I wonder how to start my Server connection (simple button click that take 2 sec) without my UI freeze and after the connection established update my UI, i can do it via BackgroundWorker and inside worker_RunWorkerCompleted event update my UI but because this is different thread i need to use Invoke:

 private void btnConnect_Click(object sender, EventArgs e)
{
    btnConnect.Enabled = false;
    BackgroundWorker worker = new BackgroundWorker();
    worker.RunWorkerCompleted += worker_RunWorkerCompleted;
    worker.DoWork += worker_DoWork;
    worker.RunWorkerAsync();
}

Start do work and connect:

private void worker_DoWork(object sender, DoWorkEventArgs e)
{
    try
    {
        // Establish the connection...
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

And after the connection established update my UI:

private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    // Update UI
}

My question is can i avoid using invoke ? because in my application i have several points that i need to add, remove, update labels, DatagridView and in this way i'll have using Invoke several times, this is a common and proper to do this? There is a way to start something in different thread and after this thread ends remain to the main thread ?

Upvotes: 1

Views: 2020

Answers (1)

meilke
meilke

Reputation: 3280

You do not need Invoke in the following callbacks:

  • ProgressChanged
  • RunWorkerCompleted

Here you can access the UI elements directly without problems. The rest needs Invoke.

Upvotes: 4

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