Home » excel » is there quick way to export an array to Excel file using C#?

is there quick way to export an array to Excel file using C#?

Posted by: admin March 9, 2020 Leave a comment


I have arrays of points that contain series data (x & y). Is there a quick way to output these arrays into an excel file?


How to&Answers:

Output the data to a file, separating the array elements with commas. Then save the file as name.csv

Use FileWriter to output the file.


One of this nice things about range object is that you can assign a two dimensional array to directly to the value property. It is important that the range be the same number of cells as the array has elements.

        //using Excel = Microsoft.Office.Interop.Excel;
        String[,] myArr = new string[10, 10];
        for (int x = 0; x < 10; x++)
            for (int y = 0; y < 10; y++)
                myArr[x, y] = "Test " + y.ToString() + x.ToString();
        Excel.Application xlApp = new Excel.Application();
        xlApp.Visible = true;
        Excel.Workbook wb = xlApp.Workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
        Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets.get_Item(1);
        Excel.Range rng = ws.Cells.get_Resize(myArr.GetLength(0), myArr.GetLength(1));
        rng.Value2 = myArr;


If CSV is not satisfactory, you can use Microsoft.Office.Interop.Excel. An example is at How to: Use COM Interop to Create an Excel Spreadsheet (C# Programming Guide).


I would use a third-party xsl export component. This would save you the hassle of excel automation, and you wouldn’t have to bundle the excel interop assemblies with your application.

MyXls is a simple open-source component that does excel exports. It should cover your needs just fine.


You could do it using Ado.net. My code below assumes that there’s an excel spreadsheet called Book1.xls in a folder C:\Stuff\ and that the spread sheet has the headers ID, Name, Site already present in a sheet called Sheet1.

private void button1_Click(object sender, EventArgs e)
        string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;
                    Data Source=C:\Stuff\Book1.xls;Extended Properties=
                    ""Excel 8.0;HDR=YES;""";

        using (OleDbConnection conn = new OleDbConnection(connectionString))

            using (OleDbCommand command = conn.CreateCommand())
                command.CommandText = @"INSERT INTO [Sheet1$] (ID, Name, Site) VALUES(1, ""Phil"", ""StackOverflow.com"")";