Question

I’m doing scrap program from website. I have many threads to update info to datagridview. I’m using dataset to set binding source to datagridview. When i inserted about 100k row. My GUI program show “not responding”. I don’t know how to solve it. This is my delegate to insert :

public void InsertLine(string line)
{
  this.MyDV.BeginInvoke(new MethodInvoker(delegate()
  {                 
    string[] park = Regex.Split(line, @",");
    try
    {
        //Insert new row
        MyDatasset.MyTableRow row = this.MyDataSet.MyTable.NewMyTableRow();
        row.Message = park[0].Trim();
        row.From = park[1].Trim();              
        this.MyDataSet.MyTable.Rows.Add(row);

        //Set color text for new row
        DataGridViewRow myrow = (from DataGridViewRow r in MyDV.Rows
                                 where (long)r.Cells[clId.Name].Value == row.Id
                                 select r).FirstOrDefault();
        if (myrow != null)
        {
            myrow.Cells[clFrom.Name].Style.ForeColor = Color.Blue;
            myrow.Cells[clMessage.Name].Style.ForeColor = Color.Blue;
        }       
    }
    catch { }
    try
    {
        this.MyDV.FirstDisplayedScrollingRowIndex = this.MyDV.Rows[this.MyDV.Rows.Count - 2].Index; //Scroll to lastest row
    }
    catch { }       
}));  }

Can you guys help me? I’m getting confused many hours with it. Thanks in advance.

Answer 1

What you are doing is invoking that code on the UI thread. It’s a loop that iterates potentially many rows. This is probably taking a long time and blocking the UI thread from doing anything else. You could try breaking up the work into smaller (or fixed-size) chunks and individually invoking them–which would allow the UI thread to process other messages in between.

Alternatively, you could do the work in the Application.Idle event; but, you’d likely still have to break up the work into fixed-sized chunks because you should only take a small, ideally fixed, amount of time in the Idle event.