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? ??? ?? C++ C#? ???? ???? ??? ? Excel ?? ?? ??? ???? ???? ??? ??????

C#? ???? ???? ??? ? Excel ?? ?? ??? ???? ???? ??? ??????

Jan 07, 2025 am 11:57 AM

How to Format Excel Decimal Columns Correctly When Exporting Data Using C#?

???? ? C#? ???? Excel ?? 10??? ?? ??

C#? ???? ???????? Excel? ???? ??? ? ??? ??? ? ????. ?? ?? ??? ???? ???? ?????. ?? ?? ?? ?? ???? ???? ?? ??? ??? ? ????.

? ??? ???? ?? ?? ???? ????? ?? ??? ???? ?? ??? ???? Excel ??:

private static void ExportToExcel(DataTable dt, string FileName)
{
    // Create an ExcelPackage object.
    using (ExcelPackage excelPackage = new ExcelPackage())
    {
        // Add a new worksheet to the package.
        ExcelWorksheet ws = excelPackage.Workbook.Worksheets.Add(FileName);

        // Load the data from the DataTable into the worksheet.
        ws.Cells["A1"].LoadFromDataTable(dt, true);

        // Autofit the columns to accommodate the data.
        ws.Cells[ws.Dimension.Address].AutoFitColumns();

        // Iterate through the columns and apply decimal formatting to the desired ones.
        for (int col = 1; col <= ws.Dimension.End.Column; col++)
        {
            // Get the cell in the first row (header row) of the column.
            var cell = ws.Cells[1, col];

            // If the column contains numeric data, apply decimal formatting to it.
            var columnType = dt.Columns[col - 1].DataType;
            if (columnType == typeof(decimal) || columnType == typeof(double))
            {
                // Set the number format to two decimal places.
                cell.Style.Numberformat.Format = "0.00";
            }
        }

        // Convert the ExcelPackage object to a byte array.
        byte[] bin = excelPackage.GetAsByteArray();

        // Send the byte array to the browser for download.
        Response.ClearHeaders();
        Response.Clear();
        Response.Buffer = true;
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        Response.AddHeader("content-length", bin.Length.ToString());
        Response.AddHeader("content-disposition", "attachment; filename=\"" + FileName + ".xlsx\"");
        Response.OutputStream.Write(bin, 0, bin.Length);
        Response.Flush();

        // Complete the request and clean up.
        HttpContext.Current.ApplicationInstance.CompleteRequest();
    }
}

? ???? DataTable? ?? ??? ?? ??? ??????. ExcelPackage ??? ??? ??? ???? ?????. ?? ?? ??? ? ?? ???? ?? ???? ???? ??? ?????. ???? ??? ?? ? ??? ????? ?? ??? "0.00"?? ?????. ????? ExcelPackage? ??? ??? ???? ????? ?? ??? ?????.

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