C＃发送电子邮件与附加文件（图片） [英] C# Sending Email with attached file (image)

问题描述

我的方法将使用SMTP中继服务器的电子邮件。

一切工作正常（电子邮件被发送），除外附加的文件（影像）是某种COM pressed / notexistent并不能从电子邮件检索。

的的方法是这样的：的

 公共静态布尔SendEmail（HttpPostedFileBase uploadedImage）
        {
            尝试
            {
                VAR消息= MAILMESSAGE新（）//为/发件人地址
                {
                    主题=这是主题。
                    身体=这是文本。
                };                    如果（uploadedImage =空＆放大器;！＆放大器; uploadedImage.ContentLength大于0）
                    {
                        System.Net.Mail.Attachment附件;
                        附件=新System.Net.Mail.Attachment（uploadedImage.InputStream，uploadedImage.FileName）;
                        message.Attachments.Add（附后）;
                    }
                message.IsBodyHtml = TRUE;                VAR smtpClient =新SmtpClient（）;
                // SMTP凭证
                smtpClient.Send（消息）;
                返回true;
            }
            赶上（异常前）
            {
            // LOGG例外
                返回false;
            }
        }
 

1. 的uploadedImage不为空。


2. CONTENTLENGTH为1038946字节（正确的大小）。

然而，正在发送的电子邮件中包含的图像与正确的文件名附件，虽然它的大小为0字节。

我是什么失踪？

解决方案

@ChrisRun，

1. 您应该更改参数HttpPostedFileBase作为例如字节[]。这样，您就可以重新使用在更多的地方你的类。


2. 尝试改变文件名的ContentType并添加MediaTypeNames.Image.Jpeg。



3. 此外，添加using指令进行处置和MAILMESSAGE SmtpClient

    使用（VAR消息= MAILMESSAGE新
       {
           从=新的MailAddress（[e-mail]），
           主题=这是主题。
           身体=这是文本。
           IsBodyHtml = TRUE，
           为了= {[e-mail]}
       }）
       {
           如果（镜像文件=空＆放大器;！＆放大器; imageFile.ContentLength大于0）
           {
               message.Attachments.Add（新附件（imageFile.InputStream，imageFile.ContentType，MediaTypeNames.Image.Jpeg））;
           }        使用（VAR的客户=新SmtpClient（smtp.gmail.com）
           {
               证书=新System.Net.NetworkCredential（用户，密码），
               EnableSsl =真
           }）
           {
               client.Send（消息）;
           }
       }
    

干杯

My method sends an email using a SMTP Relay Server.

Everything works fine (the email gets sent), except for that the attached file (the image) is somehow compressed/notexistent and not able to retrieve from the email.

The method looks like this:

public static bool SendEmail(HttpPostedFileBase uploadedImage)
        {
            try
            {              
                var message = new MailMessage() //To/From address
                {
                    Subject = "This is subject."
                    Body = "This is text."
                };                             

                    if (uploadedImage != null && uploadedImage.ContentLength > 0)
                    {
                        System.Net.Mail.Attachment attachment;
                        attachment = new System.Net.Mail.Attachment(uploadedImage.InputStream, uploadedImage.FileName);
                        message.Attachments.Add(attachment);
                    }
                message.IsBodyHtml = true;

                var smtpClient = new SmtpClient();
                //SMTP Credentials
                smtpClient.Send(message);
                return true;
            }
            catch (Exception ex)
            {
            //Logg exception
                return false;
            }
        }

1. The uploadedImage is not null.
2. ContentLength is 1038946 bytes (correct size).

However, the email that is being sent contains the image as an attachment with correct filename, although it's size is 0 bytes.

What am I missing?

解决方案

@ChrisRun,

1. You should change the parameter HttpPostedFileBase as byte[] for example. This way you could re-use your class in more places.
2. Try changing FileName for ContentType and add the MediaTypeNames.Image.Jpeg.

3. Also, add the using directive for dispose the MailMessage and SmtpClient

       using (var message = new MailMessage
       {
           From = new MailAddress("[e-mail]"),
           Subject = "This is subject.",
           Body = "This is text.",
           IsBodyHtml = true,
           To = { "[e-mail]" }
       })
       {
           if (imageFile != null && imageFile.ContentLength > 0)
           {
               message.Attachments.Add(new Attachment(imageFile.InputStream, imageFile.ContentType, MediaTypeNames.Image.Jpeg));
           }
   
           using (var client = new SmtpClient("smtp.gmail.com")
           {
               Credentials = new System.Net.NetworkCredential("user", "password"),
               EnableSsl = true
           })
           {
               client.Send(message);
           }
       }
   

Cheers

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