Calling a BackgroundWorker to update the UI

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Hi
I have a Class which contains a BackgroundWorker to update the data in Form from database. Also I have a another class which is used to create a context menu and its events.
I have to call backgroundworker from the event in the second class. Is it Possible to do it.

sample Code

class Main

C#

public partial class FormMain: Form
{
 private void bwMain_DoWork(object sender, DoWorkEventArgs e)
 {
   //Fetch data

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

public class MenuMain
{
 MenuMain()
 {
  MenuItem miPayLoan = new MenuItem("Menu1", new EventHandler(Menu1_Click));
 }
  private void miPayLoan_Click(object sender, EventArgs e)
{
  //do some operations 
  //here call backgroundworker of above class to update Form   
}
}

Thanks ..

Posted 29-Jul-13 2:08am

Geo Jackson

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Marco Bertschi · Answer 1 · 2013-07-29T03:09:00

Solution 1

Hi there,

Please try these links:
http://stackoverflow.com/questions/10019960/update-gui-from-background-worker-or-event[^]
http://stackoverflow.com/questions/1862590/how-to-update-gui-with-backgroundworker[^]

Posted 29-Jul-13 3:09am

Marco Bertschi

lukeer · Answer 2 · 2013-07-29T03:12:00

Sure.

C#

private void miPayLoan_Click(object sender, EventArgs e)
{
    //do some operations
    //here call backgroundworker of above class to update Form
    MainForm.StartFormUpdatingMethod();
}

Of course, you need a bit more code. In your FormMain.cs:

C#

public partial class FormMain : Form
{
    // This may also reside in FormMain.Designer.cs,
    //   depends on how you added it to the project.
    BackgroundWorker bwMain = new BackgroundWorker();

    public void StartFormUpdatingMethod()
    {
        bwMain.StartAsync();
    }

    // What you showed already
}

To make this work, you need a reference to the instance of FormMain available in miPayLoan_Click(). If it resides within the FormMain class itself, that's trivial. Otherwise you'll have to provide a reference.