如何使用OpenPop保存电子邮件附件

Question

我创建了一个Web电子邮件应用程序,如何查看和保存附件？

我正在使用OpenPop,第三方dll,我可以发送带附件的电子邮件和阅读没有附件的电子邮件.

这很好用:

Pop3Client pop3Client = (Pop3Client)Session["Pop3Client"]; // Creating newPopClient 
int messageNumber = int.Parse(Request.QueryString["MessageNumber"]);
Message message = pop3Client.GetMessage(messageNumber);
MessagePart messagePart = message.MessagePart.MessageParts[1];
lblFrom.Text = message.Headers.From.Address; // Writeing message. 
lblSubject.Text = message.Headers.Subject;
lblBody.Text=messagePart.BodyEncoding.GetString(messagePart.Body);

第二部分代码显示了附件的内容,但只有在它是文本文件时才有用.我需要能够保存附件.我在这里的代码的底部部分写了我的消息正文,所以如果我收到一个附件,我无法查看我的消息正文.

if (messagePart.IsAttachment == true) { 
    foreach (MessagePart attachment in message.FindAllAttachments()) { 
        if (attachment.FileName.Equals("blabla.pdf")) { // Save the raw bytes to a file
            File.WriteAllBytes(attachment.FileName, attachment.Body); //overwrites MessagePart.Body with attachment 
        } 
    } 
}

Answer 1

如果有人还在寻找答案,这对我来说很好.

var client = new Pop3Client();
try
{            
    client.Connect("MailServerName", Port_Number, UseSSL); //UseSSL true or false
    client.Authenticate("UserID", "password");   

    var messageCount = client.GetMessageCount();
    var Messages = new List<Message>(messageCount);

    for (int i = 0;i < messageCount; i++)
    {
        Message getMessage = client.GetMessage(i + 1);
        Messages.Add(getMessage);
    }

    foreach (Message msg in Messages)
    {
        foreach (var attachment in msg.FindAllAttachments())
        {
            string filePath = Path.Combine(@"C:\Attachment", attachment.FileName);
            if(attachment.FileName.Equals("blabla.pdf"))
            {
                FileStream Stream = new FileStream(filePath, FileMode.Create);
                BinaryWriter BinaryStream = new BinaryWriter(Stream);
                BinaryStream.Write(attachment.Body);
                BinaryStream.Close();
            }
        }
    }
}
catch (Exception ex)
{
    Console.WriteLine("", ex.Message);
}
finally
{
    if (client.Connected)
        client.Dispose();
}

Answer 2

对于未来的读者来说,更新版本的Pop3有更简单的方法

using( OpenPop.Pop3.Pop3Client client = new Pop3Client())
        {
            client.Connect("in.mail.Your.Mailserver.com", 110, false);
            client.Authenticate("usernamePop3", "passwordPop3", AuthenticationMethod.UsernameAndPassword);
            if (client.Connected)
            {
                int messageCount = client.GetMessageCount();
                List<Message> allMessages = new List<Message>(messageCount);
                for (int i = messageCount; i > 0; i--)
                {
                    allMessages.Add(client.GetMessage(i));
                }
                foreach (Message msg in allMessages)
                {
                    var att = msg.FindAllAttachments();
                    foreach (var ado in att)
                    {
                        ado.Save(new System.IO.FileInfo(System.IO.Path.Combine("c:\\xlsx", ado.FileName)));
                    }
                }
            }
           }

Answer 3

该类OpenPop.Mime.Message具有ToMailMessage()将 OpenPop 的 Message 转换为 的方法System.Net.Mail.MailMessage，该方法具有一个Attachments属性。尝试从那里提取附件。