无法从 Web 发送带有附件的邮件

Question

我需要从网络下载一个文本文件并将其附加到邮件中，然后再发送出去。下面是我所做的，但它抛出异常"发送邮件失败。请求被驳回"

WebRequest request = FtpWebRequest.Create("http://samplesite/sampletext.txt"));
request.Credentials = new NetworkCredential("admin", "admin");
using (WebResponse response = request.GetResponse())
{
    Stream responseStream = response.GetResponseStream();
    msg.Attachments.Add(new Attachment(responseStream, dictIterator.Key)); //on commenting this, it  works fine
}
client.Send(msg);  //throws exception

我确定这与附件有关，因为评论它可以正常工作。

Answer 1

在从

响应对象的流中读取和使用响应对象之前，您正在释放响应对象。我还没有测试过代码，但这是如何使用它的简单想法：

byte[] myResponse;
using (WebResponse response = request.GetResponse())
{
    Stream responseStream = response.GetResponseStream();
    myResponse = ReadFully(responseStream);//done with the stream now and dispose it
    msg.Attachments.Add(new Attachment(Encoding.ASCII.GetString(myResponse), dictIterator.Key));
}
client.Send(msg);

Answer 2

试试这段代码：

SmtpClient client=new SmtpClient( );
        client.Credentials = new NetworkCredential("username", "password");
        MailMessage msg = new MailMessage();
        client.Host = "yourHost";
        msg.From =new MailAddress( "adress-from");
        msg.To.Add( new MailAddress("adress-to"  ));
        msg.Subject = "your subject";
        msg.Body="your message";
        System.Net.WebRequest myrequest;
        System.Net.WebResponse myresponse;
        System.IO.Stream s;
        string url = "your url to the file";
        myrequest = System.Net.WebRequest.Create(url);
        myresponse = myrequest.GetResponse();
        s = myresponse.GetResponseStream();
        msg.Attachments.Add(new Attachment( s,System.Net.Mime.MediaTypeNames.Text.Plain));

        client.Send(msg);