c# - 将图像添加到 System.Net.Mail 消息

Question

我的解决方案中的 Resources.resx 文件中存储了一些图像。我想在我的电子邮件中使用这些图像。我已将图像加载到变量中：

Bitmap myImage = new Bitmap(Resources.Image);

现在我想把它放在我用来创建 HTML 电子邮件的 AlternateView 字符串的 HTML 中。只是需要一些帮助。

这是 HTML 字符串（部分）：

 body += "</HEAD><BODY><DIV style='height:100%; width:700px;'><div style='height:70px; width:700px; background-color:red;'><img src='" + myImage + "' width='104' height='27' alt='img' style='margin: 20px 0px 0px 20px;'/></div>

任何帮助将不胜感激谢谢！

编辑：这是整个代码块。我想我快要得到它了，只是缺乏经验阻碍了这里:) 我尝试将其转换为建议的字节，这让我走得更远。仍然没有渲染图像。这里有些事情我做得不对。非常感谢大家帮助大家！这是代码（我需要的图像 HTML 位于字符串 body = code 的第 3 行）：

 if (emailTo != null)
        {

            Bitmap myImage = new Bitmap(Resources.comcastHeader);
            ImageConverter ic = new ImageConverter();
            Byte[] ba = (Byte[])ic.ConvertTo(myImage, typeof(Byte[]));
            MemoryStream image1 = new MemoryStream(ba);

            LinkedResource headerImage = new LinkedResource(image1, "image/jpeg");
            headerImage.ContentId = "companyLogo";


            System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
            message.To.Add("" + emailTo + "");
            message.Subject = "" + customer + " Your order is being processed...";
            message.From = new System.Net.Mail.MailAddress("noreply@stormcopper.com");



            string body = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">";
            body += "<HTML><HEAD><META http-equiv=Content-Type content=\"text/html; charset=iso-8859-1\">";
            body += "</HEAD><BODY><DIV style='height:100%; width:700px;'><div style='height:70px; width:700px; background-color:red;'><img src=\"cid:companyLogo\" width='104' height='27' alt='img' style='margin: 20px 0px 0px 20px;'/></div><P>Hello " + customer + ",</P><P>Thank you for shopping at <a href='" + store + "'>" + store + "</A>.  Your order is being processed and will be shipped to you soon.  We would like to take this time to thank you for choosing Storm Copper Components, and we hope you are completely satisfied with your purchase. Please review your information and make sure all the information is correct.  If there are any errors in your order, please contact us immediately <A href='mailto:busbar@stormcopper.com'>here.</A></P>";               
            body += "<P><B>Here is your order information:</B></P>";
            body += "<H3>Contact Information</H3><TABLE><TR><TD><B>Name:</B> " + customer + "</TR></TD><TR><TD><B>Address:</B> " + street + " " + city + ", " + state + " " + zip + "</TR></TD><TR><TD><B>Email:</B> " + emailTo + "</TR></TD><TR><TD><B>Phone:</B> " + phone + "</TR></TD><TR><TD></TD></TR></TABLE>";
            body += "<H3>Products Ordered</H3><TABLE>" + productInformation + "</TABLE><BR /><BR />";
            body += "<H3>Pricing Information</H3><TABLE><TR><TD>Subtotal: $" + subTotal + "</TD></TR><TR><TD>Shipping: $" + shippingInfo + " </TD></TR><TR><TD>Tax: $" + taxInfo + "</TD></TR><TR><TD><B>Total:</B> $" + total + "</TD></TR><BR /></TABLE>";
            body += "<P>Thank you for shopping with us!</P><A href='stormcopper.com'>Storm Copper Components</A>";
            body += "<P><I>This is an Auto-Generated email sent by store copper.  Your email will not be sent to Storm Copper Components if you reply to this message.  If you need to change any information, or have any questions about your order, please contact us using the information provided in this email.</I></P></DIV></BODY></HTML>";



            ContentType mimeType = new System.Net.Mime.ContentType("text/html");

            AlternateView alternate = AlternateView.CreateAlternateViewFromString(body, mimeType);

            message.AlternateViews.Add(alternate);
            System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("########");
            smtp.Send(message);

        }

score 21 · Accepted Answer

您需要将它们作为 CID/链接资源添加到电子邮件中。

这是我以前使用过的一些代码，效果很好。我希望这能给你一些指导：

创建一个AlternateView：

AlternateView av = AlternateView.CreateAlternateViewFromString(body, null, isHTML ? System.Net.Mime.MediaTypeNames.Text.Html : System.Net.Mime.MediaTypeNames.Text.Plain)

创建链接资源：

LinkedResource logo = new LinkedResource("SomeRandomValue", System.Net.Mime.MediaTypeNames.Image.Jpeg);
logo.ContentId = currentLinkedResource.Key;
logo.ContentType = new System.Net.Mime.ContentType("image/jpg");

// 将其添加到替代视图

av.LinkedResources.Add(logo);

// 最后，将替代视图添加到消息中：

msg.AlternateView.Add(av);

这里有一些文档可以帮助您了解 AlternativeView 和 LinkedResources 是什么以及它是如何工作的：

http://msdn.microsoft.com/en-us/library/system.net.mail.mailmessage.alternateviews(v=vs.110).aspx http://msdn.microsoft.com/en-us/library/ system.net.mail.linkedresource(v=vs.110).aspx http://msdn.microsoft.com/en-us/library/ms144669(v=vs.110).aspx

在 HTML 本身中，您需要执行以下操作：

"<img style=\"width: 157px; height: 60px;\" alt=\"blah blah\" title=\"my title here\" src=\"cid:{0}\" />";

注意 CID 后跟一个字符串格式 {0} - 然后我用它用随机值替换它。

更新

要返回并评论海报评论......这是海报的工作解决方案：

string body = "blah blah blah... body goes here with the image tag: <img src=\"cid:companyLogo\" width="104" height="27" />";

byte[] reader = File.ReadAllBytes("E:\\TestImage.jpg");
MemoryStream image1 = new MemoryStream(reader);
AlternateView av = AlternateView.CreateAlternateViewFromString(body, null, System.Net.Mime.MediaTypeNames.Text.Html);

LinkedResource headerImage = new LinkedResource(image1, System.Net.Mime.MediaTypeNames.Image.Jpeg);
headerImage.ContentId = "companyLogo";
headerImage.ContentType = new ContentType("image/jpg");
av.LinkedResources.Add(headerImage);


System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
message.AlternateViews.Add(av);
message.To.Add(emailTo);
message.Subject = " Your order is being processed...";
message.From = new System.Net.Mail.MailAddress("xxx@example.com");


ContentType mimeType = new System.Net.Mime.ContentType("text/html");
AlternateView alternate = AlternateView.CreateAlternateViewFromString(body, mimeType);
message.AlternateViews.Add(alternate);

// 然后发送消息！

score 1 · Accepted Answer

如果它对任何人有帮助，这里是一个基于Ahmed ilyas 非常有用的答案的版本，它将实际的位图传递给内存流，并包含IDisposable在using块中实现的各种对象 -

public void SendMailExample(string emailAddressTo, string hexColour)
    {
        // Give the LinkedResource an ID which should be passed into the 'cid' of the <img> tag -
        var linkedResourceId = "mylogo";
        var sb = new StringBuilder("");
        sb.Append("<body><p>This is the HTML email body with img tag...<br /><br />");
        sb.Append($"<img src=\"cid:{linkedResourceId}\" width=\"100\" height=\"115.5\" alt=\"Logo\"/>");
        sb.Append("<p></body>");
        var emailBodyHtml = sb.ToString();
        var emailBodyPlain = "This is the plain text email body";

        using (var message = new MailMessage())
        using (var logoMemStream = new MemoryStream())
        using (var altViewHtml = AlternateView.CreateAlternateViewFromString(emailBodyHtml, null, System.Net.Mime.MediaTypeNames.Text.Html))
        using (var altViewPlainText = AlternateView.CreateAlternateViewFromString(emailBodyPlain, null, System.Net.Mime.MediaTypeNames.Text.Plain))
        using (var client = new System.Net.Mail.SmtpClient(_smtpServer)
        {
            Port = 25,
            DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            EnableSsl = false
        })
        {
            message.To.Add(emailAddressTo);
            message.From = new MailAddress(_emailAddressFrom);
            message.Subject = "This is the email subject";

            // Assume that GetLogo() just returns a Bitmap (for my particular problem I had to return a logo in a specified colour, hence the hexColour parameter!)
            Bitmap logoBitmap = GetLogo(hexColour);
            logoBitmap.Save(logoMemStream, System.Drawing.Imaging.ImageFormat.Png);
            logoMemStream.Position = 0;

            using (LinkedResource logoLinkedResource = new LinkedResource(logoMemStream))
            {
                logoLinkedResource.ContentId = linkedResourceId;
                logoLinkedResource.ContentType = new ContentType("image/png");
                altViewHtml.LinkedResources.Add(logoLinkedResource);
                message.AlternateViews.Add(altViewHtml);
                message.AlternateViews.Add(altViewPlainText);

                client.Send(message);
            }
        }
    }

score 0 · Accepted Answer

一种选择是将图像放在一个主机中，并在 src 中放置 url，例如 "src=' http://www.host/myImage.jpg '" 这样您就不必在每封邮件中加载图像并且会更加敏捷。

score 0 · Accepted Answer

我知道这是一个旧帖子，但如果有人仍然点击这个寻找答案（就像我一样），那么我有一个更简单的答案。

您可以使用直接将文件路径作为参数的 LinkedResource 对象的简单重载。因此无需将图像显式加载到内存流中。当然，此示例假设您可以访问磁盘上的图像 -

这是对我有用的完整功能代码-

public System.Net.Mail.AlternateView GetAlternateView(string MessageText, string LogoPath, bool bSilent)
{

    try
    {
        MessageText += "<br><img title='' alt='' src='cid:SystemEmail_HTMLLogoPath' />";               

        System.Net.Mail.AlternateView view = System.Net.Mail.AlternateView.CreateAlternateViewFromString(MessageText, null, "text/html");
        System.Net.Mail.LinkedResource linked = new System.Net.Mail.LinkedResource(HttpContext.Current.Request.PhysicalApplicationPath + LogoPath);
        linked.ContentId = "SystemEmail_HTMLLogoPath";
        view.LinkedResources.Add(linked);
        return view;
    }
    catch (Exception ex)
    {
        if (bSilent)
            return null;
        else
            throw ex;
    }
}

score -2 · Accepted Answer

您不应将Bitmap对象分配给<img>标记，因为它需要图像路径。
替换这个：

body += "</HEAD><BODY><DIV style='height:100%; width:700px;'><div style='height:70px; width:700px; background-color:red;'><img src='" + myImage + "' width='104' height='27' alt='img' style='margin: 20px 0px 0px 20px;'/></div>

有以下内容：

body += "</HEAD><BODY><DIV style='height:100%; width:700px;'><div style='height:70px; width:700px; background-color:red;'><img src='" + Resources.Image+ "' width='104' height='27' alt='img' style='margin: 20px 0px 0px 20px;'/></div>

c# - 将图像添加到 System.Net.Mail 消息

5 回答 5

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