Calculate the sum of the values in the dynamic cells of a particular column in excel worksheet in WPF

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Please, is there any way at all to add up (sum up) the contents of the cells (Rows) of a given column whose number of possible rows (cells) are dynamic, that is, the number of rows are not fixed, in an excel worksheet? I've been trying without any meaningful result, i tried using offset but keep getting some COM_Exception from HRESULT blah blah......

Below is a part of a demo code am trying to use in achieving my purpose.

C#

     private void button1_Click(object sender, RoutedEventArgs e)        
           {
            excel.Application xlApp;
            excel.Workbook xlWorkBook;
            excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new excel.Application();
            var MyExcel = new excel.Application();
            xlWorkBook = xlApp.Workbooks.Add(misValue);
            xlWorkSheet = (excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            excel.Range chartRange;
            chartRange = xlWorkSheet.get_Range("$A:$A", Type.Missing);

            xlWorkSheet.Cells[1, 1] = "Temperature(deg)";
            xlWorkSheet.Cells[1, 2] = "Humidity(m-3)";
            xlWorkSheet.Cells[1, 3] = "Wind Speed(m/s)";
            xlWorkSheet.Cells[2, 1] = 33;
            xlWorkSheet.Cells[2, 2] = 45;
            xlWorkSheet.Cells[2, 3] = 34;
            xlWorkSheet.Cells[3, 1] = 23;
            xlWorkSheet.Cells[3, 2] = 26;
            xlWorkSheet.Cells[3, 3] = 43;
            xlWorkSheet.Cells[4, 1] = 45;
            xlWorkSheet.Cells[4, 2] = 24;
            xlWorkSheet.Cells[4, 3] = 34;
            xlWorkSheet.Cells[5, 1] = 40;
            xlWorkSheet.Cells[5, 2] = 32;
            xlWorkSheet.Cells[5, 3] = 42;

            decimal fdt = 0;
            int i = 2;

            excel.Range targetRange = (excel.Range)xlWorkSheet.Cells[2, 1];
            while (xlWorkSheet.Cells.Offset[i, 0].Value2 != null)
            {
                i++;
                fdt += xlWorkSheet.Cells.Offset[i, 0].Value2;
            }
            MessageBox.Show(fdt.ToString());
       
      excel.ChartObjects xlCharts = (excel.ChartObjects)xlWorkSheet.ChartObjects(Type.Missing);
      excel.ChartObject myChart = (excel.ChartObject)xlCharts.Add(400, 50, 400, 300);
      excel.Chart chartPage = myChart.Chart;      
      chartPage.SetSourceData(chartRange, misValue);
      chartPage.ChartType = excel.XlChartType.xl3DColumnClustered;

      try
      {
          myChart.Chart.HasTitle = true;
          excel.Range objRange = (excel.Range)xlWorkSheet.Cells["$A:$A", Type.Missing];
          String strData = objRange.get_Value(misValue).ToString();
          myChart.Chart.ChartTitle.Text = strData;        
      }
      catch (Exception ex)
      {
          MessageBox.Show(ex.ToString());
      }
            
      xlWorkBook.SaveAs("DemoChart_1.xls", excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue,excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);

      xlApp.Visible = true;       
}

Posted 28-Apr-12 20:04pm

Valentine 2

Updated 28-Apr-12 20:21pm

Sandeep Mewara

v2

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Comments

Sergey Alexandrovich Kryukov 30-Apr-12 12:35pm

What is "Excel worksheet in WPF"?
--SA

Valentine 2 3-May-12 9:41am

Please,can't anybody help me out on this problem?

1 solution

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Valentine 2 · Accepted Answer · 2012-05-03T18:50:00

Never mind, i have done it finally. Now for anyone that might have the same problem as me, here you go:

C#

int numRows = 0;
                double sum = 0;
                double Average = 0;
                excel.Range count = xlWorkSheet.UsedRange.Columns["A", misValue] as excel.Range;
                foreach (excel.Range cell in count.Cells)
                {
                    if (cell.Value2 != null && cell.Value2 is double?)

//the "&&"  is necessary to make sure that the cell value is not null and not a //string so that error will not be flagged
                   
 {
                        sum += cell.Value2;
                        numRows += 1;
                    }

                }
                
                Average = sum / numRows;

               txtAverage.Text = Average.ToString();