将上传的文件作为附件发送

Question

我正试图将上传的文件作为附件发送到我的ashx文件中。下面是我使用的代码:

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("[e-mail]");
message.Subject = "test";
message.From = new MailAddress("[e-mail]");
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。是否需要先保存文件再添加到附件?

Answer 1

您不需要也不应该不必要地将附件保存到服务器。ASP Snippets有一篇关于如何在ASP中做到这一点的文章。净WebForms。

在c# MVC中这样做会更好:

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

跟随Serj Sagan的脚步，这里是一个使用webforms的处理程序，但使用<input type="file" name="upload_your_file" />而不是<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);
}

这是有用的，如果你不需要(或不能添加)runat="server"在您的表单标签。

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是客户端的文件名，而不是服务器端的文件名。您将需要使用savea或InputStream将任何内容放入附件。

这是MSDN文档的链接