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

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.