12

我已经创建了一个 Web 电子邮件应用程序，如何查看和保存附件？

我使用的是第三方 dll OpenPop ，我可以发送带附件的电子邮件，也可以阅读不带附件的电子邮件。

这工作正常： 

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);

代码的第二部分显示附件的内容，但这仅在它是文本文件时才有用。我需要能够保存附件。此外，我在此处的代码的底部部分会覆盖我的邮件正文，因此如果我收到附件，我将无法查看我的邮件正文。 

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 
        } 
    } 
}
4

7 回答 7

16

如果有人仍在寻找答案，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();
}
于 2014-02-18T13:44:50.677 回答
6

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)));
                    }
                }
            }
           }
于 2014-02-05T06:49:21.330 回答
4

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。

于 2012-05-12T12:57:03.250 回答
0

我很久以前写过这个，但是看看我用来在 POP 服务器上的电子邮件消息中保存 XML 附件的这段代码：

OpenPOP.POP3.POPClient client = new POPClient("pop.yourserver.co.uk", 110, "your@email.co.uk", "password_goes_here", AuthenticationMethod.USERPASS); 
if (client.Connected) {
int msgCount = client.GetMessageCount();

/* Cycle through messages */
for (int x = 0; x < msgCount; x++)
    {
        OpenPOP.MIMEParser.Message msg = client.GetMessage(x, false);
        if (msg != null) {
            for (int y = 0; y < msg.AttachmentCount; y++)
            {
                Attachment attachment = (Attachment)msg.Attachments[y];

                if (string.Compare(attachment.ContentType, "text/xml") == 0)
                {
                    System.Xml.XmlDocument doc = new System.Xml.XmlDocument();

                    string xml = attachment.DecodeAsText();
                    doc.LoadXml(xml);
                    doc.Save(@"C:\POP3Temp\test.xml");
                }
            }
        }
    }
}
于 2012-06-19T16:24:10.530 回答
0 
 List<Message> lstMessages = FetchAllMessages("pop.mail-server.com", 995, true,"Your Email ID", "Your Password");

上面的代码行使用相应的弹出邮件服务器从您的电子邮件中获取所有消息的列表。

例如，要获取列表中最新（或第一封）电子邮件的附件，您可以编写以下代码。

 List<MessagePart> lstAttachments = lstMessages[0].FindAllAttachments();  //Gets all the attachments associated with latest (or first) email from the list.
 for (int attachment = 0; attachment < lstAttachments.Count; attachment++)
 {
         FileInfo file = new FileInfo("Some File Name");
         lstAttachments[attachment].Save(file);
 }
于 2016-04-07T05:12:28.730 回答
0 
    private KeyValuePair<byte[], FileInfo> parse(MessagePart part)
    {
        var _steam = new MemoryStream();
        part.Save(_steam);
        //...
        var _info = new FileInfo(part.FileName);
        return new KeyValuePair<byte[], FileInfo>(_steam.ToArray(), _info);
    }

    //... How to use
    var _attachments = message 
        .FindAllAttachments()
        .Select(a => parse(a))
    ;
于 2017-08-25T19:37:54.140 回答
-1

以防万一有人想要 VB.NET 的代码： 

For Each emailAttachment In client.GetMessage(count).FindAllAttachments
    AttachmentName = emailAttachment.FileName
    '----// Write the file to the folder in the following format: <UniqueID> followed by two underscores followed by the <AttachmentName>
    Dim strmFile As New FileStream(Path.Combine("C:\Test\Attachments", EmailUniqueID & "__" & AttachmentName), FileMode.Create)
    Dim BinaryStream = New BinaryWriter(strmFile)
    BinaryStream.Write(emailAttachment.Body)
    BinaryStream.Close()
Next
于 2015-04-16T04:29:53.343 回答