Question

嗨，我相信我非常接近弄清楚我的代码有什么问题，但希望有人可以帮助我或指出我正确的方向。我能够运行我的程序，在用户将要上传文件的页面上，它为我提供了选择文件的选项。但是当我按下提交时，其他信息会发送给我，但文件永远不会出现。我想这是因为我无法确定在发送到我的电子邮件时临时保存文件的位置。这是我目前的代码：

此代码的用途是我网站上的评论/请求页面，用户可以在其中发表评论并添加屏幕截图。

private string SendMessage(string strTo, string strFrom, string strSubject, string    strMessage, string strAttachment, string strBCC)
{
    try
    {
        MailMessage mailMsg;
        string strEmail = "";
        string strSmtpClient = ConfigurationManager.AppSettings["SmtpClient"];
        string[] arrEmailAddress = strTo.Split(';');
        for (int intCtr = 0; intCtr < arrEmailAddress.Length; intCtr++)
        {
            strEmail = "";
            if (arrEmailAddress[intCtr].ToString().Trim() != "")
            {
                strEmail = arrEmailAddress[intCtr].ToString().Trim();
                mailMsg = new MailMessage(strFrom, strEmail, strSubject, strMessage);
                mailMsg.IsBodyHtml = true;
                if (!strBCC.Trim().Equals(string.Empty))
                    mailMsg.Bcc.Add(strBCC);

                SmtpClient smtpClient = new SmtpClient(strSmtpClient);
                smtpClient.UseDefaultCredentials = true;
                smtpClient.Port = 25;

                smtpClient.Send(mailMsg);
                mailMsg.Dispose();
            }
        }
        return "Message sent to " + strTo + " at " + DateTime.Now.ToString() + ".";
    }
    catch (Exception objEx)
    {
        return objEx.Message.ToString();
    }

    string strUpLoadDateTime = System.DateTime.Now.ToString("yyyyMMddHHmmss");
    string strFileName1 = string.Empty;
    if ((File1.PostedFile != null) && (File1.PostedFile.ContentLength > 0))
    {
        string strUploadFileName1 = File1.PostedFile.FileName;
        strFileName1 = strUpLoadDateTime + "." + Path.GetFileNameWithoutExtension(strUploadFileName1) + Path.GetExtension(strUploadFileName1);
        strFileName1 = strFileName1.Replace("'", "");
        string strSaveLocation = Server.MapPath("") + "\\" + strFileName1;
        File1.PostedFile.SaveAs(strSaveLocation);
        txtComments.Text = "The file has been uploaded";
    }

我的问题是我在哪里出错了，在这个代码中，我把文件放在哪里。

下面的代码部分是我用来格式化电子邮件的方式。并选择将在电子邮件中发送的内容。

protected void Submit_Click1(object sender, EventArgs e)
{
    try
    {
        string dandt = System.DateTime.Now.ToString("yyyyMMddHHmmss");
        string strMessage = "Bug Name: " + txtBugName.Text.Trim() + "<br/>" +
                     "Module Name: " + ddlModule.SelectedValue + "<br/>" +
                     "Page Name: " + ddlPage.SelectedValue + "<br/>" +
                     "Description: " + txtComments.Text.Trim() + "<br/>" +
                      File1.f + "<br/>" +
                      "Email is" + " " + txtemail.Text.Trim() + "<br/>" +
                      "The request was sent at" + dandt;  

        SendMessage(ConfigurationManager.AppSettings["EmailAddrTo"],
            ConfigurationManager.AppSettings["EmailAddrFrom"],
            txtBugName.Text.Trim(),
            strMessage, "", "");
    }
    catch 
    {
    }
}

出于某种原因，当我按提交时，我的电子邮件中没有任何内容发送。此外，我试图弄清楚如何在电子邮件中输入电子邮件发送的时间和日期。即使显然我的电子邮件会有这些信息，但由于某种原因，我希望有时间和日期用户按下提交按钮。在这部分代码中File.F的位置在哪里这是我试图找出如何获取文件附件以转到电子邮件的地方，但我不确定代码中应该采用什么语法。

Answer 1

您似乎正在尝试将用户计算机中的某些文件附加到您要发送的电子邮件中。如果是这种情况，您需要先上传文件，然后才能致电SendMessage.

在Submit_Click中，您需要做的第一件事就是将文件上传到某处的代码。另外，从File1.f中移除strMessage，这是我怀疑导致您的消息无效的地方。

上传文件后，将strSavedLocation（保存文件的文件位置）传递给SendMessage()方法。

在SendMessage方法中，您可以使用以下代码附加文件：MailMessage。 strAttachment是您上传文件的路径名称：

var attachment = new Attachment(strAttachment);
// Add time stamp information for the file.
ContentDisposition disposition = attachment.ContentDisposition;
disposition.CreationDate = System.IO.File.GetCreationTime(strAttachment);
disposition.ModificationDate = System.IO.File.GetLastWriteTime(strAttachment);
disposition.ReadDate = System.IO.File.GetLastAccessTime(strAttachment);
mailMsg.Attachments.Add(attachment);

Answer 2

在我看来，你在这里的主要部分减去了方便的System.Net.Mail.Attachment。

如果我这样做，我会将文件上传处理代码移到Submit_Click处理程序中，然后只需添加Mail.Attachment代码。

    private string SendMessage(string strTo, string strFrom, string strSubject, string strMessage, string strAttachment, string strBCC)
    {
        try
        {
            System.Net.Mail.MailMessage mailMsg;
            string strEmail = "";
            string strSmtpClient = ConfigurationManager.AppSettings["SmtpClient"];
            string[] arrEmailAddress = strTo.Split(';');
            for (int intCtr = 0; intCtr < arrEmailAddress.Length; intCtr++)
            {
                strEmail = "";
                if (arrEmailAddress[intCtr].ToString().Trim() != "")
                {
                    strEmail = arrEmailAddress[intCtr].ToString().Trim();
                    mailMsg = new MailMessage(strFrom, strEmail, strSubject, strMessage);
                    mailMsg.IsBodyHtml = true;
                    if (!strBCC.Trim().Equals(string.Empty))
                        mailMsg.Bcc.Add(strBCC);

                    /*** Added mail attachment handling ***/    
                    System.Net.Mail.Attachment attachment;
                    attachment = new System.Net.Mail.Attachment(strAttachment);
                    mailMsg.Attachments.Add(attachment);

                    SmtpClient smtpClient = new SmtpClient(strSmtpClient);
                    smtpClient.UseDefaultCredentials = true;
                    smtpClient.Port = 25;

                    smtpClient.Send(mailMsg);
                    mailMsg.Dispose();
                }
            }
            return "Message sent to " + strTo + " at " + DateTime.Now.ToString() + ".";
        }
        catch (Exception objEx)
        {
            return objEx.Message.ToString();
        }
    }

    protected void Submit_Click1(object sender, EventArgs e)
    {
        try
        {
            /*** Moved from SendMessage function ****/
            string strUpLoadDateTime = System.DateTime.Now.ToString("yyyyMMddHHmmss");
            string strFileName1 = string.Empty;
            if ((File1.PostedFile != null) && (File1.PostedFile.ContentLength > 0))
            {
                string strUploadFileName1 = File1.PostedFile.FileName;
                strFileName1 = strUpLoadDateTime + "." + Path.GetFileNameWithoutExtension(strUploadFileName1) + Path.GetExtension(strUploadFileName1);
                strFileName1 = strFileName1.Replace("'", "");
                string strSaveLocation = Server.MapPath("") + "\\" + strFileName1;
                File1.PostedFile.SaveAs(strSaveLocation);
                txtComments.Text = "The file has been uploaded";
            }

            string dandt = System.DateTime.Now.ToString("yyyyMMddHHmmss");
            string strMessage = "Bug Name: " + txtBugName.Text.Trim() + "<br/>" +
                         "Module Name: " + ddlModule.SelectedValue + "<br/>" +
                         "Page Name: " + ddlPage.SelectedValue + "<br/>" +
                         "Description: " + txtComments.Text.Trim() + "<br/>" +
                          strSaveLocation + "<br/>" +
                          "Email is" + " " + txtemail.Text.Trim() + "<br/>" +
                          "The request was sent at" + dandt;


            SendMessage(ConfigurationManager.AppSettings["EmailAddrTo"],
                ConfigurationManager.AppSettings["EmailAddrFrom"],
                txtBugName.Text.Trim(),
                strMessage, strSaveLocation, "");
        }
        catch
        {
        }
    }

关于使用StringBuilder的注意事项，我同意，我会这样使用它：

System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.AppendFormat("Bug Name: {0}<br/>", txtBugName.Text.Trim());
sb.AppendFormat("Module Name: {0}<br/>", ddlModule.SelectedValue);

编辑添加：另外，请参阅Brad上面关于使用ContentDisposition的回答。

如何在c＃中将文件附加到电子邮件

2 个答案: