C# 发送邮件整理，包括控制台程序、WPF、WebForm 及 ASP.NET MVC

　　发送邮件使用SMTP服务器，有两种方案，一种是使用IIS的SMTP功能；另一种是直接使用邮件供应商的SMTP，比如Gmail、Sina、QQ等，使用这些SMTP服务器必须得注册帐号，一般可以直接用邮箱及密码，但是有些邮箱必须开启POP3/SMTP服务才可以，比如QQ邮箱默认是关闭的，可以在“设置”->“账户”里面找到。我今天整理的都是用的第二种。

　　早期的.NET版本用的是 System.Web.Mail 类提供的功能来发邮件；2.0版本推出了 System.Net.Mail 类来代替 System.Web.Mail ，但是我在 WebForm 里面使用的时候用System.Net.Mail 老是触发异常，后来改用 System.Web.Mail 才成功了，可以看下我代码里的区别；ASP.NET MVC 3 提供了 WebMail 类来发送邮件，更加方便。

　　控制台程序、WPF、WebForm 及 ASP.NET MVC 我都测试了一下，控制台程序和 WPF 都用了 System.Net.Mail ，WebForm 和 ASP.NET MVC 都可以用 System.Web.Mail ，而 ASP.NET MVC 3 直接用 WebMail 更方便。下面我把代码分别贴出来。

　　控制台程序：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Mail;//添加引用
  
namespace SendEmail
{
    class Program
    {
        static void Main(string[] args)
        {
            Program p = new Program();
            bool flag = p.SendEmail();
            if (flag)
            {
                Console.Write("Success !");
            }
              
            Console.Read();
        }
  
        public bool SendEmail()
        {
            MailMessage msg = new MailMessage();
            msg.To.Add("1234567@qq.com");//邮件接收者的帐号
            msg.From = new MailAddress("1234567@qq.com", "nickname", System.Text.Encoding.UTF8);//发送邮件的帐号及显示名称和字符编码
            msg.Subject = "Subject";//邮件标题 
            msg.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题编码 
            msg.Body = "Content";//邮件内容 
            msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码 
            msg.IsBodyHtml = false;//是否是HTML邮件 
            msg.Priority = MailPriority.High;//邮件优先级
  
            SmtpClient client = new SmtpClient();
            client.Credentials = new System.Net.NetworkCredential("1234567@qq.com", "password");//注册的邮箱和密码，就QQ邮箱而言，如果设置了独立密码，要用独立密码代替密码             
            client.Host = "smtp.qq.com";//QQ邮箱对应的SMTP服务器
            object userState = msg;
            try
            {
                client.SendAsync(msg, userState);
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return false;
            }
        }
    }
}

WPF:

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Net.Mail;//添加引用
   using System.Text;
   using System.Windows;
   using System.Windows.Controls;
   using System.Windows.Data;
   using System.Windows.Documents;
   using System.Windows.Input;
   using System.Windows.Media;
   using System.Windows.Media.Imaging;
   using System.Windows.Navigation;
   using System.Windows.Shapes;
   
   namespace WPFSendMail
   {
       /// <summary>
       /// MainWindow.xaml 的交互逻辑
       /// </summary>
       public partial class MainWindow : Window
       {
           public MainWindow()
           {
               InitializeComponent();
           }
   
           private void Button_Click(object sender, RoutedEventArgs e)
           {
               bool flag = SendMail();
               if (flag)
               {
                   MessageBox.Show("Success !","Tips"); 
               }
           }
   
           public bool SendMail()
           {
               MailMessage message = new MailMessage();
               message.To.Add("       @qq.com");
               message.From = new MailAddress("       @qq.com","nickname",Encoding.UTF );
               message.Subject = "Sending e-mail in WPF !";
               message.SubjectEncoding = Encoding.UTF ;
               message.Body = "Awesome";
               message.BodyEncoding = Encoding.UTF ;
               message.IsBodyHtml = false;
               message.Priority = MailPriority.Normal;
               Attachment att = new Attachment("text.txt");//添加附件，确保路径正确
               message.Attachments.Add(att);
   
               SmtpClient smtp = new SmtpClient();
               smtp.Credentials = new System.Net.NetworkCredential("       @qq.com","password");
               smtp.Host = "smtp.qq.com";
               object userState = message;
   
               try
               {
                   smtp.SendAsync(message,userState);
                   return true;
               }
               catch (Exception ex)
               {
                   MessageBox.Show(ex.Message,"Tips");
                   return false;
               }
           }
       }
   }

Winform:

   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Text;
   using System.Web;
   using System.Web.UI;
   using System.Web.UI.WebControls;
   using System.Web.Mail;//添加引用
   
   namespace WebFormSendEmail
   {
       public partial class WebForm  : System.Web.UI.Page
       {
           protected void Page_Load(object sender, EventArgs e)
           {
   
           }
   
           protected void Button _Click(object sender, EventArgs e)
           {
               bool flag = SendMail();
               if (flag)
               {
                   Response.Write("<script>alert('Success !');</script>");   
               }
           }
   
           public bool SendMail()
           {
               MailMessage message = new MailMessage();
               message.To = "       @qq.com";
               message.From = "       @qq.com";
               message.Subject = "Sending e-mail in Web !";
               message.Body = "Awesome";
               //基本权限
               message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", " ");
               //用户名
               message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "       @qq.com");
               //密码
               message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "password"); 
   
               SmtpMail.SmtpServer = "smtp.qq.com";
               try
               {
                   SmtpMail.Send(message);
                   return true;
               }
               catch (Exception ex)
               {
                   Response.Write(ex.Message);
                   return false;
               }
           }
       }
   }

MVC:

        try
        {
            WebMail.SmtpServer = "smtp.qq.com";
            WebMail.SmtpPort = 25;//端口号，不同SMTP服务器可能不同，可以查一下
            WebMail.EnableSsl = false;//禁用SSL
            WebMail.UserName = "1234567@qq.com";
            WebMail.Password = "password";
            WebMail.From = "1234567@qq.com";
            WebMail.Send("1234567@qq.com","Subject",“Content");
        }
        catch (Exception)
        {
           
        }