Background Worker with progress bar

Question

I am trying to get a ProgressBar with the progress of a dataset being converted to Excel using the BackgroundWorker . The problem is that the work is being done in a different class than the ProgressBar and I am having difficulty calling worker.ReportProgress(...) from within my loop. I am sorry if this is a easy thing but I am new to C# and have been trying this the whole day and just can't seem to get it right. Your help would be HIGHLY appreciated.

namespace CLT
{
    public partial class GenBulkReceipts : UserControl
    {
        private void btnOpen_Click(object sender, EventArgs e)
        {
            Cursor.Current = Cursors.WaitCursor;
            try
            {
                OpenFile();
            }

            Cursor.Current = Cursors.Default;
        }
        private void OpenFile()

        {
            if (dsEx1.Tables[0].Rows.Count > 0)
            {
                  backgroundWorker1.RunWorkerAsync(dsEx1);
            }
        }

        public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            DataSet ImportDataSet = e.Argument as DataSet;
            AccountsToBeImported = new BLLService().Get_AccountsToBeReceipted(ImportDataSet);
        }

        public void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;
        }

        // ...
    }
}

namespace BLL
{
    class GenBulkReceiptsBLL
    {
        public DataSet Get_AccountsToBeReceipted(DataSet dsImport)
        {
            DataSet dsReturn = AccountsDAL.QGenReceiptAccounts(0,0,"");//Kry Skoon DataSet wat ge-populate moet word

            CLT.GenBulkReceipts pb = new CLT.GenBulkReceipts();
            int TotalRows = dsImport.Tables[0].Rows.Count;
            //pb.LoadProgressBar(TotalRows);
            int calc = 1;
            int ProgressPercentage;

            foreach (DataRow dr in dsImport.Tables[0].Rows)
            {
               ProgressPercentage = (calc / TotalRows) * 100;

                //This is the problem as I need to let my Progressbar progress here but I am not sure how
                //pb.worker.ReportProgress(ProgressPercentage);
            }

            return dsReturn;
        }

        // ...
    }
}

Answer 1

You'll need to pass your worker to the Get_AccountsToBeReceipted method - it can then call BackgroundWorker.ReportProgress :

// In GenBulkReceipts
public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;
    DataSet importDataSet = e.Argument as DataSet;
    AccountsToBeImported =
         new BLLService().Get_AccountsToBeReceipted(importDataSet, worker);
}

// In GenBulkReceiptsBLL
public DataSet Get_AccountsToBeReceipted(DataSet dsImport,
                                         BackgroundWorker worker)
{
    ...
    worker.ReportProgress(...);
}

Alternatively, you could make GenBulkReceiptsBLL have its own Progress event, and subscribe to that from GenBulkReceipts - but that would be more complicated.

Answer 2

Your class GenBulkReceiptsBLL needs some reference to the BackgroundWorker instance. You can achieve this in a variety of ways. One such suggestion would be to pass the reference to the class when instantiating it.

For example, since GenBulkReceipts is the class that instantiates GenBulkReceiptsBLL , then in the constructor for GenBulkReceiptsBLL , you could pass the instance of the BackgroundWorker that is currently being used in GenBulkReceipts . This would allow for you to call ReportProcess(...) directly. Alternately, you could pass the reference directly into the Get_AccountsToBeReceipted(...) method.