CODEWITHSUNDEEP
c#backgroundworkerinvoke
Jarrod
Jarrod

Reputation: 13

BackgroundWorker - Form Refresh

I'm trying to make it so that my form refreshes when I click a button. However I keep getting an error

'Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.'

 private void button1_Click(object sender, EventArgs e)
    {
        worker.DoWork += formReload;
        worker.RunWorkerAsync();
    }

    static BackgroundWorker worker = new BackgroundWorker();

    private void formReload(object sender, DoWorkEventArgs ev)
    {
        this.Refresh();
    }

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {

    }

I've tried to research it, and I get that I have to use the Invoke method, however I don't understand where to put it, and why to use it? Any help would be much appreciated!

Thanks, Jarrod

Upvotes: 0

Views: 1947

Answers (1)

Tobia Zambon
Tobia Zambon

Reputation: 7629

Actually your code does nothing, the DoWork is unnecessary. You can rewrite your code as:

private void button1_Click(object sender, EventArgs e)
{
    worker.RunWorkerAsync();
}

static BackgroundWorker worker = new BackgroundWorker();

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    if (this.InvokeRequired)
        this.Invoke(new Action(()=>Refresh()));
}

Assuming that you subscribed the DoWork method in the contructor using

worker.DoWork += backgroundWorker1_DoWork;

Take note that a Refresh doesn't change anything. What do you have to refresh?

Upvotes: 4

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