从数据表发送带有excel的电子邮件作为c#中的附件

Question

我有一个数据表。我想将数据表的内容作为 excel 发送，并将电子邮件作为附件发送。我尝试了下面的代码，但它正在发送 expty excel 文件。

首先，我将数据表转换为流对象，并将流传递给带有其他邮件参数的 sendemail 方法。

 private static Stream DataTableToStream(System.Data.DataTable table)
        {
            const string semiColon = ";";

            var ms = new MemoryStream();
            var sw = new StreamWriter(ms);

            foreach (DataColumn column in table.Columns)
            {
                sw.Write(column.ColumnName);
                sw.Write(semiColon);
            }
            sw.Write(Environment.NewLine);
            foreach (DataRow row in table.Rows)
            {
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    sw.Write(row[i].ToString().Replace(semiColon, string.Empty));
                    sw.Write(semiColon);
                }
                sw.Write(Environment.NewLine);
            }
            return ms;
        }

下面是发送邮件代码

 private const string ExcelContentType = "application/ms-excel";

        private static bool SendMail(MailAddress from, string to, string[] CCAddress, String strSubject, String strBody, Attachment attachment, Stream tableStream)
        {
            try
            {
                const string attchmentName = "Weekly Vendor Report.xlsx";
                SmtpClient client = new SmtpClient();
                client.Host = "mail.lamrc.com";

                System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
                message.From = from;
                message.IsBodyHtml = true;
                message.Subject = strSubject;
                message.Body = strBody;
                message.To.Add(to);

                message.Attachments.Add(new Attachment(tableStream, attchmentName, ExcelContentType));
.......

}

Answer 1

使用EPPlus库将数据表转换为excel并转换为附件。

    public static Attachment GetAttachment(DataTable dataTable)
    {
        MemoryStream outputStream = new MemoryStream();
        using (ExcelPackage package = new ExcelPackage(outputStream))
        {
            ExcelWorksheet facilityWorksheet = package.Workbook.Worksheets.Add("sheetName");
            facilityWorksheet.Cells.LoadFromDataTable(dataTable, true);

            package.Save();
        }

        outputStream.Position = 0;
        Attachment attachment = new Attachment(outputStream, "sample.xlsx", "application/vnd.ms-excel");

        retutn attachment;
    }