如何使用图像从HTML模板生成电子邮件

Question

我正在尝试从HTML模板生成Outlook电子邮件，更改电子邮件中的某些值。

如果HTML模板中有图像，它们会起作用然后停止工作，而是显示“红叉”。他们通常在制作HTML模板后第二天停止工作。

我首先使用Outlook制作HTML模板，但实际上无法避免这种情况。

这是我的代码：

private void generateEmail(object sender, EventArgs e)
    {

        String firstDate = formatDate(dtFirstDate.Value);
        String secondDate = formatDate(dtSecondDate.Value);
        String dateOne = formatDate(dtDate1.Value);
        String dateTwo = formatDate(dtDate2.Value);
        String dateThree = formatDate(dtDate3.Value);

        string strHTML = "";
        string subjectPrefix = "";

       try
          {
          strHTML = File.ReadAllText(templateLocation + "/PRF_Request.htm");
          subjectPrefix = "PRF - ";
          }
       catch
          {
          MessageBox.Show("Template Not Found");
          return;
          } 

        /*
         * Replace Placeholder Tags in the HTML with data.
         */
        string email = strHTML
            .Replace("�", " ")
            //.Replace("##Name##", user)
            .Replace("##application##", tAppName.Text + " (" + tVendor.Text + ") " + tVersion.Text)
            .Replace("##FirstDate##", firstDate)
            .Replace("##SecondDate##", secondDate)
            .Replace("##date1##", dateOne)
            .Replace("##date2##", dateTwo)
            .Replace("##date3##", dateThree);


        if (rbOutlook.Checked)
        {

            Microsoft.Office.Interop.Outlook.Application objOutlook = new Microsoft.Office.Interop.Outlook.Application();
            Microsoft.Office.Interop.Outlook.MailItem oMail = (Microsoft.Office.Interop.Outlook.MailItem)(objOutlook.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem));
            //Microsoft.Office.Interop.Outlook.Attatchment colAttach = new Attachments;

            // Assigns the default email attributes
            oMail.To = "";
            oMail.CC = "";
            oMail.BCC = "";

            oMail.Subject = subjectPrefix + tAppName.Text + " (" + tVendor.Text + ") " + tVersion.Text + " - " + tAppID.Text;

            if (bImportance.Checked){

                oMail.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceHigh;

            }else{
                oMail.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceNormal;
            }

            // Define the Mail Message Body.
            oMail.HTMLBody = email;
            oMail.Display();

        }
        else if (rbLotus.Checked)
        {
            MessageBox.Show("Generate Lotus Notes Email");
        }
    }