sum filtered rows in datagridview (C#)

[Yangkyu Lee]

I am struggling with the problem of summing filtered rows of datagridview. I can sum the whole datatable with the following program. But I want to summarize only filtered rows of datatable. How can I do that?

private void sumRows(DataTable table)
{
  DataRow row = table.NewRow();
  for (int i = 1; i < table.Columns.Count; i++)
  {
     row[i] = 0;
  }
  table.Rows.InsertAt(row, 0);
  Decimal num, sum;
  for (int i = 1; i < table.Columns.Count; i++)
  {
     sum = 0;
     foreach (DataRow r in table.Rows)
     {
        try
        {
           if (Decimal.TryParse(r[i].ToString(), out num))
           {
              sum += num;
           }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
     }
    row[i] = sum.ToString();
   }
}

[Fr33dan]

Your problem is that the method you wrote works on a the DataTable object, which to which the filter is applied inside the BindingSource class. To iterate through filtered data directly use the DataGridView instance instead:

private void sumRows(DataGridView table)
{
    int sumRow = table.Rows.Add();
 
    Decimal num, sum;
    for (int i = 1; i < table.Columns.Count; i++)
    {
        sum = 0;
        // The last row is for the sums so don't include it in the loop
        for (int j = 0; j < table.Rows.Count - 1; j++)
        {
            try
            {
                if (Decimal.TryParse(table[i, j].Value.ToString(), out num))
                {
                    sum += num;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        table[i, sumRow].Value = sum.ToString();
    }
}

Also it may be me being nitpicky but I think it's bad form to use a foreach loop inside of a for loop when iterating through a grid of data so I changed it.

[Fr33dan]

If this was the answer please flag the post, so others can see what the resolution was.

[Yangkyu Lee]

Thank you very much for your help!!! I really appreciate.
But the problem is that DataGridView is binded to database source, so when I tried your method an error has occurred.
Here is the code calling the method:

dataAdapter = new SqlDataAdapter(cmd);
try
{
BindingSource bindingSource = new BindingSource();
objConnection.Open();
dataAdapter.Fill(table);
objConnection.Close();
sumRows(table); // original position
bindingSource.DataSource = table;
bindingSource.Filter = determineFilter();
dgvEmp.DataBindings.Clear();
dgvEmp.DataSource = table;
//sumRows(dgvEmp); // new position
dgvEmp.Refresh
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

@Fr33dan

[120689]

@Fr33dan



>> thanks for giving me idea... this helps me to perfect my code... :)