CODEWITHSUNDEEP
c#multithreadingdatagridviewbackgroundworker
Murtaza Munshi
Murtaza Munshi

Reputation: 1085

BackgroundWroker cross-thread operation not valid

I created a backgroundworker to fill a datagirdview. The DatagridView is filled using a list which gets 2000 records from the table. I used background worker to remove the non-responsive UI.

private BackgroundWorker worker;
worker = new BackgroundWorker() { WorkerReportsProgress = true };
worker.DoWork += worker_DoWork;
worker.RunWorkerAsync();

void worker_DoWork(object sender, DoWorkEventArgs e)
{
    var listAccGroups = vwAccVoucherDetails.ToList(); // vwAccVoucherDetails is the table containing records.
    dgvBalanceSheet.DataSource = listAccGroups;
}

The error I am getting is:

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

How can I set the datagridView's datasource without getting these kind of errors?

Upvotes: 0

Views: 2311

Answers (3)

VahiD
VahiD

Reputation: 1064

You can not access UIThread from background worker thread, in this case you can fill the grid after backgroundWorker completed, so you can add filling datagrid code into worker_completed method, but in cases you want to update UI when worker in progress, you have to implement InvokerRequired, BeginInvoke Pattern

Upvotes: 0

CodingIntrigue
CodingIntrigue

Reputation: 78545

You need to use the Completed event of BackgroundWorker:

BackgroundWorker worker = new BackgroundWorker() { WorkerReportsProgress = true };
worker.DoWork += worker_DoWork;
worker.Completed += worker_Completed;
worker.RunWorkerAsync();

void worker_DoWork(object sender, DoWorkEventArgs e)
{
    e.Result = vwAccVoucherDetails.ToList(); // vwAccVoucherDetails is the table containing records.
}

void worker_Completed(object sender, RunWorkerCompletedEventArgs e) {
  dgvBalanceSheet.DataSource = e.Result;
}

Follow the steps in this tutorial for detailed instructions on how to use the BackgroundWorker class.

Upvotes: 3

meilke
meilke

Reputation: 3280

Use the ProgressChanged or RunWorkerCompleted callbacks on the background worker (similar to the DoWork event handling). This will then be done on the UI thread and you won't have the difficulties that show up now.

Upvotes: 0

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