如何使用C＃中的Mail功能发送带有嵌入式图像的电子邮件？

Question

我想要的只是发送带有嵌入式图片的电子邮件。我正在努力，我不知道为什么我不能得到它。系统发送该电子邮件但没有显示图像，这里是结果的快照：

您能否帮我修改下面显示的代码以处理发送该图片的问题？我们假设我们有任何形象。

C＃代码：

protected void Page_Load(object sender, EventArgs e)
    {
        Send();
    }


    protected void SendEmail(string toAddresses, string fromAddress, string MailSubject, string MessageBody, bool isBodyHtml, AlternateView av)
    {
        SmtpClient sc = new SmtpClient("MailAddress");
        try
        {
            MailMessage msg = new MailMessage();
            msg.From = new MailAddress("test@mailAddress.com", "Test Sys");   

            //QuizLink is appSetting inside your web config
            string newLink = System.Configuration.ConfigurationManager.AppSettings["QuizLink"].ToString();


            msg.Bcc.Add(toAddresses);
            msg.Subject = MailSubject;
            msg.Body = MessageBody;
            msg.IsBodyHtml = isBodyHtml;
            msg.AlternateViews.Add(av);
            sc.Send(msg);
        }
        catch (Exception ex)
        {
            throw ex;
        }

    }

    protected void SendEmailTOAllUser()
    {
        string connString = "Data Source=localhost;Initial Catalog=TestDB;Integrated Security=True";

        using (SqlConnection conn = new SqlConnection(connString))
        {
            var sbEmailAddresses = new System.Text.StringBuilder(2000);
            string quizid = "";

            // Open DB connection.
            conn.Open();

            string cmdText = "SELECT MIN (QuizID) As mQuizID FROM dbo.QUIZ WHERE IsSent <> 1";
            using (SqlCommand cmd = new SqlCommand(cmdText, conn))
            {
                SqlDataReader reader = cmd.ExecuteReader();
                if (reader != null)
                {
                    while (reader.Read())
                    {
                        // There is only 1 column, so just retrieve it using the ordinal position
                        quizid = reader["mQuizID"].ToString();

                    }
                }
                reader.Close();
            }

            string cmdText2 = "SELECT Username FROM dbo.employee";
            using (SqlCommand cmd = new SqlCommand(cmdText2, conn))
            {
                SqlDataReader reader = cmd.ExecuteReader();
                if (reader != null)
                {
                    while (reader.Read())
                    {
                        var sName = reader.GetString(0);
                        if (!string.IsNullOrEmpty(sName))
                        {
                            if (sbEmailAddresses.Length != 0)
                            {
                                sbEmailAddresses.Append(",");
                            }
                            // Just use the ordinal position for the user name since there is only 1 column
                            sbEmailAddresses.Append(sName).Append("@mailAddress.com");
                        }
                    }
                }
                reader.Close();
            }

            string cmdText3 = "UPDATE dbo.Quiz SET IsSent = 1 WHERE QuizId = @QuizID";
            using (SqlCommand cmd = new SqlCommand(cmdText3, conn))
            {
                // Add the parameter to the command
                var oParameter = cmd.Parameters.Add("@QuizID", SqlDbType.Int);

                var sEMailAddresses = sbEmailAddresses.ToString();
                string link = "<a href='http://localhost/test.aspx?testid=" + quizid + "'> Click here to participate </a>";
                string body = @"................";
                AlternateView av = AlternateView.CreateAlternateViewFromString(body, null, MediaTypeNames.Text.Html);
                LinkedResource lr = new LinkedResource("contactUs.gif", MediaTypeNames.Image.Gif);
                lr.ContentId="image1";
                av.LinkedResources.Add(lr);


                int sendCount = 0;
                List<string> addressList = new List<string>(sEMailAddresses.Split(','));
                StringBuilder addressesToSend = new StringBuilder();

                if (!string.IsNullOrEmpty(quizid))
                {
                    for (int userIndex = 0; userIndex < addressList.Count; userIndex++)
                    {
                        sendCount++;
                        if (addressesToSend.Length > 0)
                            addressesToSend.Append(",");

                        addressesToSend.Append(addressList[userIndex]);
                        if (sendCount == 10 || userIndex == addressList.Count - 1)
                        {
                            SendEmail(addressesToSend.ToString(), "", "........", body, true, av);
                            addressesToSend.Clear();
                            sendCount = 0;
                        }
                    }

                    // Update the parameter for the current quiz
                    oParameter.Value = quizid;
                    // And execute the command
                    cmd.ExecuteNonQuery();
                }

            }
            conn.Close();
        }
    }

Answer 1

在您的所有问题中，似乎您发送的图像是/somefolder/image.jpg，因为用户正在从另一个域名中读取图片，因此您无法以这种方式发送图像，因此如果您看看你的图像的源代码，你会发现它与你使用的不同。

你应该发送像这样的图像链接

<img src='http://www.mydomainname.com/fulladdress/someimage.png usemap' ='#clickMap'>