How do you create an excel file in C#?

[Brian Connelly]

Hello,
I am currently having issues with the following code when trying to create a excel file using C#. This is the code that I have at the moment.

    oXL = new Microsoft.Office.Interop.Excel.Application();
            oXL.Visible = false;
            oWK = (Microsoft.Office.Interop.Excel._Workbook)(oXL.Workbooks.Add(System.Reflection.Missing.Value));
            oWK.SaveAs(path + "\\" + fileName);
            oWS = (Microsoft.Office.Interop.Excel._Worksheet)oWK.Worksheets.get_Item(1);
            oWS.Cells[1, 1] = "Student ID";
            oWS.Cells[1, 2] = "Student Name";
            oWK.Save();

The line that I am having issues with is

oWS = (Microsoft.Office.Interop.Excel._Worksheet)oWK.Worksheets.get_Item(1);

If I remove it, I am able to create and save teh workbook in the directory. However, I want to make some changes on a worksheet, and that is where the issue is. I have also tried using the line of code:

oWS = (Microsoft.Office.Interop.Excel._Worksheet)oWK.Worksheets[1];

. This line hade no luck either. The issue I am having is the error regarding InvalidOperatio nException: Dynamic operations can only be performed in homogenous AppDomain.

Any help would be greatly appreciated.

[Ghostwolf]

I just tested it, and your code for creating the workbook works just fine.

So I did a search for "homogenous appdomain" and found http://social.msdn.microsoft.com/For...main?forum=pex The last post on the page describes his resolution.

HTH

[leo23]

Two ways to achieve this.
1).If you have Microsoft Excel Object Library installed,then can check the source code below

using System;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel; 

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

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

            xlApp = new Excel.ApplicationClass();
            xlWorkBook = xlApp.Workbooks.Add(misValue);

            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            xlWorkSheet.Cells[1, 1] = "http://csharp.net-informations.com";

            xlWorkBook.SaveAs("csharp-Excel.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
            xlWorkBook.Close(true, misValue, misValue);
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);

            MessageBox.Show("Excel file created , you can find the file c:\\csharp-Excel.xls");
        }

        private void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
            }
            finally
            {
                GC.Collect();
            }
        }
    }
}

REGARDS