您可以从字符串创建System.Net.Mail.Attachment然后正常发送邮件。

 var m = new System.Net.Mail.MailMessage(from, to, subject, body); var a = System.Net.Mail.Attachment.CreateAttachmentFromString(stringWrite.ToString(), "application/vnd.xls"); m.Attachments.Add(a); 

  protected void btnSend_OnClick(object sender, EventArgs e) { MailMessage mail = new MailMessage(); byte[] data = new byte[1024]; MemoryStream stream = new MemoryStream(data); Attachment attach = new Attachment(stream, "Attachment file name"); mail.Attachments.Add(attach); new SmtpClient().Send(mail); } 

您可以将文件内容保存为字节数组，然后执行以下操作：

创建内存中的邮件附件

这是我之前提到的一个工作示例，代码中有一些额外的逻辑将GridView解析为Table。

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  //Table to store our GridView Data Table table = new Table(); //Parse our GridView into Table, stored in a StringBuilder StringBuilder sb = new StringBuilder(); using (StringWriter sw = new StringWriter(sb)) { using (HtmlTextWriter htw = new HtmlTextWriter(sw)) { // header if (GridView1.HeaderRow != null) { table.Rows.Add(GridView1.HeaderRow); } // details foreach (GridViewRow row in GridView1.Rows) { table.Rows.Add(row); } // footer if (GridView1.FooterRow != null) { table.Rows.Add(GridView1.FooterRow); } // render table table.RenderControl(htw); } } using (MemoryStream memoryStream = new MemoryStream()) { using (StreamWriter writer = new StreamWriter(memoryStream)) { //Convert StringBuilder to MemoryStream writer.Write(sb.ToString()); writer.Flush(); //Create Message MailMessage message = new MailMessage(); message.To.Add(new MailAddress("you@address.com", "You")); message.From = new MailAddress("me@address.com", "Me"); message.Subject = "The Subject"; //Create Attachment Attachment attachment = new Attachment(memoryStream, "InvoiceSummary.xls", "application/vnd.xls"); //Attach Attachment to Email message.Attachments.Add(attachment); //Open SMTP connection to server and send SmtpClient smtp = new SmtpClient(); smtp.Port = 25; smtp.Send(message); } }