c# - 我可以发送图像和 rar 文件，但这些文件已被 asp.net 损坏？

Question

我正在使用 asp.net 和 c#.net 发送带有大附件(最大 10mb)的邮件，这就是我可以转换文件的原因，.txt、.doc、.xls 文件可以完美发送，但图像和 rar文件损坏是什么问题请给我任何建议，我的代码是

 DataSet ds = SqlHelper.ExecuteDataset(con, "usp_GetEmailSettings", Session["UserID"].ToString());
                message.To.Add(ds.Tables[0].Rows[0]["Email"].ToString());
                message.CC.Add(ds.Tables[1].Rows[0]["EmailID"].ToString());
                message.Subject = ds.Tables[0].Rows[0]["Email_Subject"].ToString();
                message.From = new System.Net.Mail.MailAddress(ds.Tables[1].Rows[0]["EmailID"].ToString());
                message.Body = ds.Tables[0].Rows[0]["Email_Body"].ToString() +
                                       "<br/><br/> <font size='2.0em'>Submission Number : " +filename+"<br/> DBA Name : " +txtDBAName.Text + "<br/> Insured Name : " +TxtInsured.Text + "<br/> Additional Comments : " + txtcomment.Value ;
                message.IsBodyHtml = true;
                string attachId;
                System.Net.Mail.Attachment at;
 // Get the HttpFileCollection and Attach the Multiple files
                HttpFileCollection hfc = Request.Files;
                if (hfc.Count > 0)
                {
                    for (int i = 0; i < hfc.Count; i++)
                    {
                        HttpPostedFile hpf = hfc[i];
                        if (hpf.ContentLength > 0)
                        {
                            if (i == 0)
                            {
                                string[] ext = System.IO.Path.GetFileName(hpf.FileName).Split('.');
                                attachId = filename + "." + ext[1];
                                at = new System.Net.Mail.Attachment(fluuploader.FileContent, attachId);
                            }

                            else
                            {
                                string[] ext = System.IO.Path.GetFileName(hpf.FileName).Split('.');
                                attachId = filename + "(" + i + ")" + "." + ext[1];
                                at = new System.Net.Mail.Attachment(fluuploader.FileContent, attachId);
                            }
                            at.TransferEncoding = System.Net.Mime.TransferEncoding.SevenBit;
                           // at.TransferEncoding = System.Net.Mime.TransferEncoding.QuotedPrintable;                       
                            message.Attachments.Add(at);
                        }

                    }
                }
 smtp.Timeout = 9999999;
                smtp.Send(message);  

web.config 我的代码是

<httpRuntime executionTimeout="240" maxRequestLength="20480"/>

at.TransferEncoding = System.Net.Mime.TransferEncoding.SevenBit; 我可以在该行中给出评论不发送大文件但一切正常但我已发送大文件最大值10mb，请给我建议

Answer 1

除非幕后发生了一些黑魔法，否则我认为您需要将 fluuploader.FileContent 换成 hpf.InputStream。此外，我发现将 In​​putStream 的 Position 设置为 0 会有所帮助。for 循环中的最终代码应如下所示:

    HttpPostedFile hpf = hfc[i];

    if (hpf.ContentLength > 0)
    {
        hpf.InputStream.Position = 0;

        if (i == 0)
        {
            string[] ext = System.IO.Path.GetFileName(hpf.FileName).Split('.');
            attachId = filename + "." + ext[1];
            at = new System.Net.Mail.Attachment(hpf.InputStream, attachId);
        }

        else
        {
            string[] ext = System.IO.Path.GetFileName(hpf.FileName).Split('.');
            attachId = filename + "(" + i + ")" + "." + ext[1];
            at = new System.Net.Mail.Attachment(hpf.InputStream, attachId);
        }

        message.Attachments.Add(at);
    }