I can generate an Excel file when I pass a datatable
into the below function:
public static void ExportDataTableToExcel(DataTable dt, string filepath)
{
object missing = Type.Missing;
object misValue = System.Reflection.Missing.Value;
//create excel
Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
//add excel workbook
Microsoft.Office.Interop.Excel.Workbook wb = excel.Workbooks.Add();
//add worksheet to workbook
Microsoft.Office.Interop.Excel.Worksheet ws = wb.Sheets[1] as Microsoft.Office.Interop.Excel.Worksheet;
//add 2nd worksheet to workbook
Microsoft.Office.Interop.Excel.Worksheet ws2 = wb.Sheets[2] as Microsoft.Office.Interop.Excel.Worksheet;
//Set the header-row bold
ws.Range["A1", "A1"].EntireRow.Font.Bold = true;
//Adjust all columns
ws.Columns.AutoFit();
//spit top row
ws.Application.ActiveWindow.SplitRow = 1;
//insert image into worsheet 2
ws2.Shapes.AddPicture("C:\\Koala.JPG", Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, 50, 50, 300, 300);
//freeze top row
ws.Application.ActiveWindow.FreezePanes = true;
int rowCount = 1;
foreach (DataRow dr in dt.Rows)
{
rowCount += 1;
for (int i = 1; i < dt.Columns.Count + 1; i++)
{
// Add the header the first time through
if (rowCount == 2)
{
ws.Cells[1, i] = dt.Columns[i - 1].ColumnName;
ws.Cells[1, i].Interior.ColorIndex = 40;
// add cell border
ws.Cells[1, i].Borders.LineStyle = Excel.XlLineStyle.xlContinuous;
}
ws.Cells[rowCount, i] = dr[i - 1].ToString();
// add cell border
ws.Cells[rowCount, i].Borders.LineStyle = Excel.XlLineStyle.xlContinuous;
}
}
Microsoft.Office.Interop.Excel.Range range = (Microsoft.Office.Interop.Excel.Range)ws.UsedRange;
Console.Write(range.ToString());
wb.SaveAs(@"C:\Test.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue,
misValue, misValue, misValue,
Excel.XlSaveAsAccessMode.xlExclusive, misValue,
misValue, misValue, misValue, misValue);
wb.Close(missing, missing, missing);
excel.Quit();
}
This function works well. I need to add a graph from C# code to this Excel file. I tried a few methods, but did not find proper way to implement.
Take a look at the tutorial here (one of the first Google hits).
It very clearly describe how to make a simple chart in Excel from C# code.
The general idea is like this:
// Add chart.
var charts = worksheet.ChartObjects() as
Microsoft.Office.Interop.Excel.ChartObjects;
var chartObject = charts.Add(60, 10, 300, 300) as
Microsoft.Office.Interop.Excel.ChartObject;
var chart = chartObject.Chart;
// Set chart range.
var range = worksheet.get_Range(topLeft, bottomRight);
chart.SetSourceData(range);
// Set chart properties.
chart.ChartType = Microsoft.Office.Interop.Excel.XlChartType.xlLine;
chart.ChartWizard(Source: range,
Title: graphTitle,
CategoryTitle: xAxis,
ValueTitle: yAxis);