如何在 .Net Core 中发送附有 pdf 文件的 AWS 原始电子邮件？

Question

这是我目前所做的

public static async Task<bool> SendEmailWithAttachmentAsync(EmailObj emlData)
    {
        var replyToAddresses = new List<string>();
        replyToAddresses.Add("Email");

        try
        {
            var options = new CredentialProfileOptions
            {
                AccessKey = "1234",
                SecretKey = "5678"
            };

            var profile = new CredentialProfile("default", options);
            var sharedFile = new SharedCredentialsFile();
            sharedFile.RegisterProfile(profile);

            using (var client = new 
            AmazonSimpleEmailServiceClient(RegionEndpoint.APSoutheast2))
            {
                var bodyBuilder = new BodyBuilder();

                bodyBuilder.HtmlBody = "Hello World. Please view the attachment.";
                bodyBuilder.TextBody = "Hello World. Please view the attachment.";

                var mimeMessage = new MimeMessage();
                mimeMessage.From.Add(new MailboxAddress("Name", "Email"));
                mimeMessage.To.Add(new MailboxAddress("Recipient Name", "Email"));

                mimeMessage.Subject = "Hello World";
                
                //using (var messageStream = new MemoryStream())
                //{
                    MemoryStream messageStream = new MemoryStream();
                    
                    emlData.Report.ExportToPdf(messageStream);
                    messageStream.Seek(0, System.IO.SeekOrigin.Begin);
                bodyBuilder.Attachments.Add("File.pdf", messageStream, new 
                ContentType("application", "pdf"));
                mimeMessage.WriteTo(messageStream);
                
                var sendRequest = new SendRawEmailRequest {
                        Source = senderAddress,
                        Destinations = new List<string> { "Email" },
                        RawMessage = new RawMessage(messageStream)
                    };

                var response = await client.SendRawEmailAsync(sendRequest);

                if (response.MessageId != null)
                {
                    messageStream.Close();
                    messageStream.Flush();
                }

                    
                //}
                

                return true;
            }
        }
        catch (Exception err)
        {
            return false;
        }
    }

我试过将代码放入 using(memoryStream){} 但似乎不起作用。 emlData.Report.ExportToPdf(消息流);此处的报告是来自 DevExpress 报告的 XtraReport，代码工作正常，因为我已成功完成下载部分，但不知何故发送电子邮件不起作用。

Any help would be appreciated, thank you. I've attached an image of what I got in my email.

Answer 1

我已经按照 here 中的示例进行操作，并且能够使用以下代码使用 MimeKit 发送带有 PDF 附件的电子邮件：

public static void ReadPdfIntoMemoryStream(MemoryStream memoryStream)
{
    byte[] fileContents = File.ReadAllBytes(filename);
    memoryStream.Write(fileContents, 0, fileContents.Length);
}

public static async Task<bool> SendEmailWithAttachmentAsync()
{
    try
    {
        using (var client = new AmazonSimpleEmailServiceClient(RegionEndpoint.USEast1))
        {
            var bodyBuilder = new BodyBuilder();

            bodyBuilder.HtmlBody = "Hello World. Please view the attachment.";
            bodyBuilder.TextBody = "Hello World. Please view the attachment.";

            using (MemoryStream ms = new MemoryStream())
            {
                ReadPdfIntoMemoryStream(ms);
                ms.Seek(0, System.IO.SeekOrigin.Begin);
                bodyBuilder.Attachments.Add("Test.pdf", ms, new ContentType("application", "pdf"));
            }

            var mimeMessage = new MimeMessage();
            mimeMessage.From.Add(new MailboxAddress("Name", senderAddress));
            mimeMessage.To.Add(new MailboxAddress("Recipient Name", destinationAddress));
            mimeMessage.Subject = "Hello World";

            mimeMessage.Body = bodyBuilder.ToMessageBody();
            using (var messageStream = new MemoryStream())
            {
                await mimeMessage.WriteToAsync(messageStream);
                var sendRequest = new SendRawEmailRequest { RawMessage = new RawMessage(messageStream) };
                var response = await client.SendRawEmailAsync(sendRequest);
                Console.WriteLine(response.HttpStatusCode);
            }

            return true;
        }
    }
    catch (Exception err)
    {
        Console.WriteLine(err.Message);
        return false;
    }
}

ReadPdfIntoMemoryStream 方法模拟您的 emlData.Report.ExportToPdf 并将 PDF 加载到内存流中。您可以将此内存流直接传递给 bodyBuilder 附件。不要重复使用此内存流来发送原始消息。新建一个。