我把MSDN里面的一个示例改了下,可是运行不成功。大虾指点下啊 MSDN-URL: ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEVFX.v20.chs/cpref10/html/M_System_Net_Mail_SmtpClient_SendAsyncCancel.htm#codeExampleToggleusing System; using System.Net; using System.Net.Mail; using System.Net.Mime; using System.Threading; using System.ComponentModel;namespace Examples.SmptExamples.Async { public class SimpleAsynchronousExample { static bool mailSent = false; public static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e) { // Get the unique identifier for this asynchronous operation. String token = (string)e.UserState; if (e.Cancelled) { Console.WriteLine("[{0}] Send canceled.", token); } if (e.Error != null) { Console.WriteLine("[{0}] {1}", token, e.Error.ToString()); } else { Console.WriteLine("Message sent."); } mailSent = true; } public static void Main(string[] args) { // Command line argument must the the SMTP host. SmtpClient client = new SmtpClient("smtp.163.com"); // Specify the e-mail sender. // Create a mailing address that includes a UTF8 character // in the display name. MailAddress from = new MailAddress("[email protected]"); // Set destinations for the e-mail message. MailAddress to = new MailAddress("[email protected]"); // Specify the message content. MailMessage message = new MailMessage(from, to); message.Body = "This is a test e-mail message sent by an application. "; // Include some non-ASCII characters in body and subject. string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192', '\u2193' }); message.Body += Environment.NewLine + someArrows; message.BodyEncoding = System.Text.Encoding.UTF8; message.Subject = "test message 1" + someArrows; message.SubjectEncoding = System.Text.Encoding.UTF8; // Set the method that is called back when the send operation ends. client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback); // The userState can be any object that allows your callback // method to identify this send operation. // For this example, the userToken is a string constant. string userState = "test message1"; client.SendAsync(message, userState); Console.WriteLine("Sending message... press c to cancel mail. Press any other key to exit."); string answer = Console.ReadLine(); // If the user canceled the send, and mail hasn't been sent yet, // then cancel the pending operation. if (answer.StartsWith("c") && mailSent == false) { client.SendAsyncCancel(); } // Clean up. message.Dispose(); Console.WriteLine("Goodbye."); } } }
MSDN-URL:
ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEVFX.v20.chs/cpref10/html/M_System_Net_Mail_SmtpClient_SendAsyncCancel.htm#codeExampleToggleusing System;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading;
using System.ComponentModel;namespace Examples.SmptExamples.Async
{
public class SimpleAsynchronousExample
{
static bool mailSent = false;
public static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
{
// Get the unique identifier for this asynchronous operation.
String token = (string)e.UserState; if (e.Cancelled)
{
Console.WriteLine("[{0}] Send canceled.", token);
}
if (e.Error != null)
{
Console.WriteLine("[{0}] {1}", token, e.Error.ToString());
}
else
{
Console.WriteLine("Message sent.");
}
mailSent = true;
}
public static void Main(string[] args)
{
// Command line argument must the the SMTP host.
SmtpClient client = new SmtpClient("smtp.163.com");
// Specify the e-mail sender.
// Create a mailing address that includes a UTF8 character
// in the display name.
MailAddress from = new MailAddress("[email protected]");
// Set destinations for the e-mail message.
MailAddress to = new MailAddress("[email protected]");
// Specify the message content.
MailMessage message = new MailMessage(from, to);
message.Body = "This is a test e-mail message sent by an application. ";
// Include some non-ASCII characters in body and subject.
string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192', '\u2193' });
message.Body += Environment.NewLine + someArrows;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.Subject = "test message 1" + someArrows;
message.SubjectEncoding = System.Text.Encoding.UTF8;
// Set the method that is called back when the send operation ends.
client.SendCompleted += new
SendCompletedEventHandler(SendCompletedCallback);
// The userState can be any object that allows your callback
// method to identify this send operation.
// For this example, the userToken is a string constant.
string userState = "test message1";
client.SendAsync(message, userState);
Console.WriteLine("Sending message... press c to cancel mail. Press any other key to exit.");
string answer = Console.ReadLine();
// If the user canceled the send, and mail hasn't been sent yet,
// then cancel the pending operation.
if (answer.StartsWith("c") && mailSent == false)
{
client.SendAsyncCancel();
}
// Clean up.
message.Dispose();
Console.WriteLine("Goodbye.");
}
}
}