Question

我正在尝试将上传的文件作为附件发送到我的ashx文件中。这是我正在使用的代码：

HttpPostedFile fileupload = context.Request.Files[0];

//filename w/o the path
string file = Path.GetFileName(fileupload.FileName);

MailMessage message = new MailMessage();

//*****useless stuff********
message.To.Add("abc@xxx.com");
message.Subject = "test";
message.From = new MailAddress("test@aaa.com");
message.IsBodyHtml = true;
message.Body = "testing";
 //*****useless stuff********

//Fault line
message.Attachments.Add(new Attachment(file, MediaTypeNames.Application.Octet))

//Send mail 
SmtpClient smtp = new System.Net.Mail.SmtpClient("xxxx", 25);
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential("xxx", "xxxx");
smtp.Send(message);

我可以发送没有附件的电子邮件。我是否需要先保存文件然后添加到附件？

Answer 1

您不需要也不应该不必要地将附件保存到服务器。这是一篇关于如何在ASP.NET WebForms http://www.aspsnippets.com/articles/Attach-files-to-email-without-storing-on-disk-using-ASP.Net-FileUpload-Control.aspx

中执行此操作的文章

在C＃MVC中实现它甚至更好：

        public IEnumerable<HttpPostedFileBase> UploadedFiles { get; set; }

        var mailMessage = new MailMessage();
        // ... To, Subject, Body, etc

        foreach (var file in UploadedFiles)
        {
            if (file != null && file.ContentLength > 0)
            {
                try
                {
                    string fileName = Path.GetFileName(file.FileName);
                    var attachment = new Attachment(file.InputStream, fileName);
                    mailMessage.Attachments.Add(attachment);
                }
                catch(Exception) { }
            }
        }

Answer 2

在Serj Sagan的the footsteps之后，这里是使用网络表单的处理程序，但使用<input type="file" name="upload_your_file" />代替<asp:FileUpload>控件：

HttpPostedFile file = Request.Files["upload_your_file"];
if (file != null && file.ContentLength > 0)
{
    string fileName = Path.GetFileName(file.FileName);
    var attachment = new Attachment(file.InputStream, fileName);
    mailMessage.Attachments.Add(attachment);
}

如果您不需要（或无法添加）表单标记上的runat="server"，这非常有用。

Answer 3

你可以这样做：

private  void btnSend_Click(object sender,EventArgs e)
{
    MailMessage myMail = new MailMessage();
    myMail.To = this.txtTo.Text;
    myMail.From = "<" + this.txtFromEmail.Text + ">" + this.txtFromName.Text;
    myMail.Subject = this.txtSubject.Text;

    myMail.BodyFormat = MailFormat.Html;
    myMail.Body = this.txtDescription.Text.Replace("\n","<br>");

    //*** Files 1 ***//
    if(this.fiUpload1.HasFile)
    {
        this.fiUpload1.SaveAs(Server.MapPath("MyAttach/"+fiUpload1.FileName));
        myMail.Attachments.Add(new MailAttachment(Server.MapPath("MyAttach/"+fiUpload1.FileName)));
    }

    //*** Files 2 ***//
    if(this.fiUpload2.HasFile)
    {
        this.fiUpload2.SaveAs(Server.MapPath("MyAttach/"+fiUpload2.FileName));
        myMail.Attachments.Add(new MailAttachment(Server.MapPath("MyAttach/"+fiUpload2.FileName)));
    }


    SmtpMail.Send(myMail);
    myMail = null;
    this.pnlForm.Visible = false;
    this.lblText.Text = "Mail Sending.";
}

Answer 4

FileName是客户端上文件的名称，而不是服务器上的文件名。您需要使用SaveAs或InputStream将任何内容添加到附件中。

Here is a link到MSDN文档。

将上传的文件作为附件发送

4 个答案: