SendGrid SMTP API：嵌入图片：坏请求

问题描述

我使用的是sendgrid SMTP API https://github.com/sendgrid/sendgrid-csharp发送电子邮件，但我无法弄清楚如何嵌入图像。我可以使用原生的.Net API的邮件没有问题，做到这一点。我只是得到一个错误的请求。这里是我的code，它是扔

 私有静态无效的主要（字串[] args）
    {
        尝试{
           ////首先创建电子邮件对象，那么添加的属性。
            VAR myMessage =新SendGridMessage（）;            CONTACT_LIST =新的List＆LT; MailAddress＆GT;（）;
            contact_list.Add（新MailAddress（[email protected]））;
            myMessage.To = contact_list.ToArray（）;
            myMessage.From =新的MailAddress（[email protected]）;
            myMessage.Subject =主题;            字符串的html =＆LT; D​​IV＆GT;＆LT; IMG SRC = CID：标志/＆GT;＆LT; / DIV＆gt;中;            myMessage.Html = HTML;
            myMessage.EmbedImage（@C：\\ logo.png，标志）;            SendMessage函数（myMessage）;
        }
        赶上（例外五）
        {
            Console.WriteLine（e.Message）;
        }    }    私有静态无效的SendMessage（SendGridMessage消息）
    {
        //创建凭据，指定您的用户名和密码。
        VAR证书=新的NetworkCredential（用户名，pwdpwdpwd）;        //创建用于发送电子邮件一个Web传输。
        VAR transportWeb =新的Web（凭证）;        //发送电子邮件。
        尝试
        {
            transportWeb.Deliver（消息）;
            Console.WriteLine（已发送！）;
        }
        赶上（异常前）
        {
            Console.WriteLine（ex.Message）;
        }
    }
 

解决方案

我想出如何得到这个工作。下面是使用code：

  VAR myMessage =新SendGridMessage（）;CONTACT_LIST =新的List＆LT; MailAddress＆GT;（）;
contact_list.Add（新MailAddress（我的电子邮件地址））;myMessage.To = contact_list.ToArray（）;
myMessage.From =新的MailAddress（[email protected]，STP客户服务）;
myMessage.Subject =STP报告数据包：+ package_report_name;
字符串IMG = @C：\\\\ logo.png
ContentType的CTYPE =新的ContentType（图像/ PNG）;
VAR附件=新的附件（IMG，CTYPE）;
VAR linkedResource =新LinkedResource（IMG，CTYPE）;
myMessage.AddAttachment（attachment.ContentStream，attachment.Name）;
myMessage.EmbedImage（attachment.Name，linkedResource.ContentId）;字符串的html =＆LT; IMG SRC = CID：+ linkedResource.ContentId +/＆gt;中;
myMessage.Html = HTML;
 

I am using the sendgrid SMTP API https://github.com/sendgrid/sendgrid-csharp to send emails but I cannot figure out how to embed an image. I can do it using .Net native mail api without issues. I am simply getting a Bad Request. Here is my code that is throwing

private static void Main(string[] args)
    {
        try {
           //// Create the email object first, then add the properties.
            var myMessage = new SendGridMessage();

            contact_list = new List<MailAddress>();
            contact_list.Add(new MailAddress("[email protected]"));
            myMessage.To = contact_list.ToArray();
            myMessage.From = new MailAddress("[email protected]");
            myMessage.Subject = "Subject";

            string html = "<div><img src=cid:Logo /></div>";

            myMessage.Html = html;
            myMessage.EmbedImage(@"C:\logo.png", "Logo");

            SendMessage(myMessage);
        }
        catch(Exception e)
        {
            Console.WriteLine(e.Message);
        }

    }

    private static void SendMessage(SendGridMessage message)
    {
        // Create credentials, specifying your user name and password.
        var credentials = new NetworkCredential("username", "pwdpwdpwd");

        // Create a Web transport for sending email.
        var transportWeb = new Web(credentials);

        // Send the email.
        try
        {
            transportWeb.Deliver(message);
            Console.WriteLine("Sent!");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

解决方案

I figured out how to get this working. Here is the code used:

var myMessage = new SendGridMessage();

contact_list = new List<MailAddress>();
contact_list.Add(new MailAddress("my email address"));

myMessage.To = contact_list.ToArray();
myMessage.From = new MailAddress("[email protected]", "STP Client Service");
myMessage.Subject = "STP Report Package: " + package_report_name;
string img = @"C:\\logo.png";
ContentType ctype = new ContentType("image/png");
var attachment = new Attachment(img, ctype);
var linkedResource = new LinkedResource(img, ctype);
myMessage.AddAttachment(attachment.ContentStream, attachment.Name);
myMessage.EmbedImage(attachment.Name, linkedResource.ContentId);

string html = "<img src=cid:"+linkedResource.ContentId+" />";
myMessage.Html = html;

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