在.NET 应用程序中用System.Web.Mail 发送电子邮…

The SMTP Service uses a directory structure to contain messages prior to delivery. The default directory is C:\Inetpub\mailroot. This folder contains a number of subdirectories such as Queue, Drop, and Badmail. If you are unable to configure your instance of the SMTP Service for delivery, you can find the message in a *.EML file in the C:\Inetpub\mailroot\Queue directory. This technique can be useful when creating messages offline.

Sending a Message
As previously mentioned, sending an e-mail is a relatively simple thing to do. The System.Web.Mail.MailMessage class represents the message to be sent. E-mail messages are constructed by using instances of this class. This class contains properties such as To, From, and Subject that allow you to control the message being sent. Attachments can be created through instances of the System.Web.Mail.MailAttachment and then added to the MailMessage through the Attachments collection of the MailMessage. The message is then delivered through the System.Web.Mail.SmtpMail class.

Sending a Message Sample Code
The following sample code contains a C#-based Windows Console application that shows how to send an e-mail message. By not specifying that the SmtpMail.SmtpServer property is not set, the localhost is used by default. You need to make sure to add a reference to the System.Web.dll because this is a console application and not an ASP.NET application.

using System;
using System.Web.Mail;

namespace CodeGuru.SendMail
{
/// <summary>
/// Test console application to demonstrate sending e-mail.
/// </summary>
class TestMail
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
TestMail.Send("testuser@codeguru.com",
"mstrawmyer@crowechizek.com",
"Test Message Using CDOSYS",
"Hello World! This is a simple message sent
using CDOSYS.");
}

/// <summary>
/// Send a message using the .NET wrapper for Collaborative Data
/// Objects (CDO). This method should be used when sending to a
/// single recipient only; otherwise, the list of recipients
/// will be known.
/// </summary>
/// <param name="MessageFrom">Message originator</param>
/// <param name="MessageTo">Message receipent</param>
/// <param name="MessageSubject">Message subject</param>
/// <param name="MessageBody">Message body</param>
public static void Send(string MessageFrom,
string MessageTo,
string MessageSubject,
string MessageBody)
{
MailMessage message = new MailMessage();
message.From = MessageFrom;
message.To = MessageTo;
message.Subject = MessageSubject;
message.BodyFormat = MailFormat.Text;
message.Body = MessageBody;

try
{
System.Console.WriteLine("Sending outgoing message");
SmtpMail.Send(message);
}
catch( System.Web.HttpException exHttp )
{
System.Console.WriteLine("Exception occurred:"
exHttp.Message);
}
}
}
}

Sending a Message with an Attachment Sample Code
The following sample code contains a C#-based Windows Console application that shows how to send an e-mail message that includes an attachment. This is done by creating instances of the MessageAttachment class and then adding them to the message through the Attachments collection.

using System;
using System.Web.Mail;

namespace CodeGuru.SendMail
{
/// <summary>
/// console application to demonstrate sending e-mail with an
/// attachment.
/// </summary>
class TestMail
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
TestMail.SendAttachment("testuser@codeguru.com",
"mstrawmyer@crowechizek.com",
"Test Message Using CDOSYS",
"Hello World! This is a simple
message sent using CDOSYS.",
"c:\\myattachment.txt");
}

/// <summary>
/// Send a message using the .NET wrapper for Collaborative Data
/// Objects (CDO). This method should be used when sending to
/// a single recipient only; otherwise, the list of recipients
/// will be known.
/// </summary>
/// <param name="MessageFrom">Message originator</param>
/// <param name="MessageTo">Message receipent</param>

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