我要求使用.Net 2将MailMessage对象（system.net.mail）保存到SQL Server 2005数据库中的表。
邮件对象还包含一个图像附件，它是邮件消息正文的一部分，作为邮件顶部的徽标。
这可以工作并创建我的MailMessage对象，并且可以毫无后顾之忧地发送它。
private bool SendEMAIL(string wsStudent, string wsNOKemails, string wsMSG)
{
try
{
MailMessage message = new MailMessage();
message.To.Clear();
string[] wsEmails = wsNOKemails.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
foreach (string address in wsEmails)
{
MailAddress to = new MailAddress(address);
message.To.Add(to);
}
//get staff email as the FROM address
DataSourceSelectArguments dss = new DataSourceSelectArguments();
sdsStaffDetails.SelectParameters["StaffID"].DefaultValue = Session["StaffID"].ToString();
DataView dv = sdsStaffDetails.Select(dss) as DataView;
DataTable dt = dv.ToTable() as DataTable;
if (dt != null)
{
foreach (DataRow dr in dt.Rows) //this loop will only happen once
{
message.From = new MailAddress(dr.ItemArray[2].ToString()); //TET's staffer email address
message.Subject = "Tec-NQ - TET Report for " + wsStudent;
message.Priority = MailPriority.High;
message.IsBodyHtml = true;
//add the logo attachment
MemoryStream ms = new MemoryStream(File.ReadAllBytes(Server.MapPath("../images/Tec-NQ-Logo-BlueOrange-60x174.png")));
Attachment logo = new Attachment(ms, "logo");
message.Attachments.Add(logo);
//..but create a Base64 version of it, as we'll need to embedd this into the message so it knows
//where to place the logo into the email
string contentID = "Image";
logo.ContentId = contentID;
logo.ContentDisposition.Inline = true;
logo.ContentDisposition.DispositionType = DispositionTypeNames.Inline;
//replace the <p> contents of the logo with a new HTML string header to contain the cid reference for the logo
string wsHdr = "<html><body><p><a href=\"http://www.tecnq.com.au\" target=\"_blank\"><img alt=\"tecnqlogo\" src=\"cid:" + contentID + "\" style=\"border-style:none; height:34px; width:100px\" /></a></p>";
//then place back the rest of the email
string wsBody = wsHdr + " " + wsMSG.Substring(wsMSG.IndexOf("<hr />")) + "</html></body>";
message.Body = wsBody;
//send it!
SmtpClient SmtpClient = new SmtpClient();
SmtpClient.Send(message);
}
return true;
}
else
return false;
}
catch (Exception msg)
{
StatusMessage(msg.ToString());
return false;
}
}
我已阅读this和this，但所有这些都假设您希望将MailMessage保存到磁盘上的文件中。对我来说情况并非如此。
我也读过this，这意味着我应该serialise这条消息。但据微软称，我认为MailMessage是一个无法序列化的核心对象。这是对的吗？
所以关于如何将上述内容保存为BLOB或某些数据类型的任何想法，以后我都要做的就是打开表格，读取对象并像普通电子邮件一样发送它？
更新
This CodeProject文章是我发现的前进方式。但是，在将MailMessage对象保存到磁盘时指定文件名。这是一个开始，因为我可以在文件名中指定一些字段分隔符，以指定稍后要使用的文件，包括读取EML文件和稍后通过电子邮件发送对象。
答案 0 :(得分：2)
我认为您发布的更新非常好。另请查看How to save MailMessage object to disk as *.eml or *.msg file的答案。您可能可以创建多个客户端，一个用于正确发送，另一个用于将消息保存到本地文件，然后需要将其保存到DB。我虽然没试过这个。
如果您仍在调查此事，请发布示例代码......
仅限于单个附件。该示例仅供您入门，不应该按原样使用。有很大的改进空间。
我们将附件加载到byte[]，然后将其添加为Attachment(Stream s)。我们将此作为VARBINARY内容保存到数据库中。
您的第一个发送方法，也将消息保存到db
try
{
MailMessage message = new MailMessage();
var logoPath = @"C:\MyLogo.jpg";
message.From = new MailAddress("from@email.co.nz");
message.To.Add("to@email.co.nz");
message.IsBodyHtml = true;
//Read the attachment into byte Array. This assumes single attachment only in the Mail Message.
byte[] arr = File.ReadAllBytes(logoPath);
using (var stream = new MemoryStream(arr))
{
stream.Position = 0;
Attachment logo = new Attachment(stream, "Logo");
string contentID = "Image";
logo.ContentId = contentID;
logo.ContentDisposition.Inline = true;
logo.ContentDisposition.DispositionType = DispositionTypeNames.Inline;
string wsHdr = "<html><body><p><a href=\"http://www.tecnq.com.au\" target=\"_blank\"><img alt=\"tecnqlogo\" src=\"cid:" + contentID + "\" style=\"border-style:none; height:34px; width:100px\" /></a></p>" + "</html></body>"; ;
message.Body = wsHdr;
message.Attachments.Add(logo);
SmtpClient smtp = new SmtpClient();
smtp.Host = "MyServer";
smtp.Port = 25;
smtp.Send(message);
SaveMessage(message, arr);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
保存邮件
//ZERO ERRO CHECKING.
private static void SaveMessage(MailMessage message, byte[] arr)
{
using (var conn = new SqlConnection("CONNECTION_STRING"))
{
using (var cmd = new SqlCommand("INSERT INTO MailSent (Body,Attachment) VALUES(@BODY,@ATTACHMENT)", conn))
{
conn.Open();
var param = new SqlParameter("@BODY", SqlDbType.VarChar)
{
Value = message.Body
};
var param2 = new SqlParameter("@ATTACHMENT", SqlDbType.Binary)
{
Value = arr
};
cmd.Parameters.Add(param);
cmd.Parameters.Add(param2);
cmd.ExecuteNonQuery();
}
}
}
重新发送消息
try
{
MailMessage message = new MailMessage();
byte[] arr2 = null;
GetMailMessage(2, ref message, ref arr2);
message.From = new MailAddress("from@email.co.nz");
message.To.Add("to@email.co.nz");
message.IsBodyHtml = true;
using (var stream = new MemoryStream(arr2))
{
stream.Position = 0;
Attachment logo = new Attachment(stream, "Logo");
string contentID = "Image";
logo.ContentId = contentID;
logo.ContentDisposition.Inline = true;
logo.ContentDisposition.DispositionType = DispositionTypeNames.Inline;
message.Attachments.Add(logo);
SmtpClient smtp = new SmtpClient();
smtp.Host = "MyServer";
smtp.Port = 25;
smtp.Send(message);
}
// SaveMessage(message, arr);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
要检索消息
//ZERO ERROR CHECKING.
private static void GetMailMessage(int itemId, ref MailMessage msg2, ref byte[] arr2)
{
using (var conn = new SqlConnection("CONNECTION_STRING"))
{
using (var cmd = new SqlCommand("SELECT [Body],[Attachment] FROM MailSent WHERE ID = @itemId", conn))
{
conn.Open();
cmd.Parameters.AddWithValue("@itemId", itemId);
using (SqlDataReader dr = cmd.ExecuteReader())
{
while (dr.Read())
{
msg2.Body = dr[0].ToString();
arr2 = dr[1] as byte[];
}
}
}
}
}