c#语言邮件发送参考代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Net.Mail;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.Collections;
using System.Threading;
using Microsoft.Win32;

namespace QQ邮件发送
{
    public partial class Form1 : Form
    {
        public Thread thread;//定义一个线程
        public Form1()
        {
            InitializeComponent();
            
            this.im = Image.FromFile("1.jpg");
            this.BackgroundImage = im;
        }
        string file;
        //string aa;
        ArrayList Lujing=new ArrayList();
     
        private void button6_Click(object sender, EventArgs e) //添加附件
        {
            openFileDialog1.Filter = "Word文件.doc|*.doc|表格文件.xls|*.xls|所有文件|*.*"; //筛选文件类型
            DialogResult dk = openFileDialog1.ShowDialog();  //创建一个枚举类型的变量dk来接收打开这个对话框
            if (dk == DialogResult.OK) //如果点的是确定,才会执行下面的代码
            {
             
                string[] files = openFileDialog1.FileNames;//将获取到的所有路径都存到一个string类型的数组里面
                foreach (string file in files)//遍历所有路径，一条条的加到Lujing这个ArrayList里面去，然后用的时候再从集合里面一条条遍历出来
                {
                    Lujing.Add(file);
                    txtfujianname.AppendText(file + "
");//AppendText追加文本
                }
                MessageBox.Show("添加附件成功");
                //获取附件的名字添加到文本框当中
            }


        }
     
        //下面开始写SendEmail函数
        MailMessage msg;
      
        public void SendEmail(string Emailshoujian, string Emailbiaoti, string Emailzhengwen, MailAddress EmailFrom)
        {
            try
            {
                //创建发送邮箱，并获取发件人地址，收件人地址，以及邮件标题与正文
                msg = new MailMessage();  //创建一个MailMessage的类，用来发送邮件
                msg.To.Add(Emailshoujian); //将收件人的邮箱地址添加进来  
                msg.Subject = Emailbiaoti; //获取一下发送邮件的标题
                msg.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题改成国际编码方式
                msg.From = EmailFrom;//获取一下发件人的邮箱地址
                msg.Body = Emailzhengwen;//邮件的正文内容
                msg.BodyEncoding = System.Text.Encoding.UTF8; //将邮件的正文内容改一下编码方式
                msg.IsBodyHtml = false; //确认正文内容是不是以网页格式发送的
                msg.Priority = MailPriority.High;//邮件发送的优先等级为最高

              
                //添加附件
                if(txtfujianname.Text!="")
                {
                        foreach (string path in Lujing) //路径都存到Lujing里面去了，全部遍历出来
                        {
                            Attachment data = new Attachment(path); //Attachment：附件
                            msg.Attachments.Add(data);
                        }       
                }

                // //设置用于验证发件人身份的凭据
                SmtpClient client = new SmtpClient(); //允许应用程序使用简单邮件传输协议 (SMTP) 来发送电子邮件。 
                client.Host = "smtp.qq.com"; //设置一下应用程序的服务器名称



                //请在这里输入您邮箱和密码！！！！！！！！！！！！！！！！！！！！！！！！！！！！
                client.Credentials = new System.Net.NetworkCredential("527384244@qq.com", "lk19920619"); //输入发件人邮箱的用户名密码来发送邮件
                //注意！！必须在发送的时候将发件人的邮箱账户POP3/IMAP协议开启，然后输入的密码是QQ邮箱独立密码，而不是QQ密码！！！！
                client.Send(msg);//发送
                //mail from address must be same as authorization user 若出现这个错误，证明没有将发件人邮箱的POP3/IMAP协议打开，并且密码是QQ邮箱独立密码，而不是QQ密码
                //打开方式在最有一张截图
                MessageBox.Show("发送成功");
            }
            catch (Exception ex  )
            {

                throw ex;
            }
           
        }

        //当点击发送按钮的时候启动新的线程，从而不会因为卡住而影响到别的按钮的功能
        private void button1_Click(object sender, EventArgs e) //发送按钮
        {
            //thread = new Thread(new ThreadStart(fasong)); //为button1按钮造一个新的线程，这样点button1的话，就会运行新造的这个线程，而不会影响到窗体的主线程，button1执行的发送，点了button1如果卡住，但不会影响到别的按钮的作用
            //thread.IsBackground = true;//确认新造的线程后台运行
            //thread.Start();
            fasong();
        }
        public void fasong()
        {
            // MailAddress 表示电子邮件发件人或收件人的地址。
            MailAddress EmailFrom = new MailAddress("527384244@qq.com");  //发件人邮箱地址 //创建一个MailAddress的类来写发件人的地址
            string Emailshoujian = txtshoujian.Text;  //收件人邮箱地址
            string Emailbiaoti = txtbiaoti.Text; //邮件标题
            string Emailzhengwen = textBox1.Text; //邮件内容
            SendEmail(Emailshoujian, Emailbiaoti, Emailzhengwen, EmailFrom);  //调用发送邮件函数
        }
        private bool isok;
        private int dianxiaqux;
        private int dianxiaquy;
        private int chushix;
        private int chushiy;
        private int movex;
        private int movey;
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            isok = true;
            dianxiaqux = Cursor.Position.X;
            dianxiaquy = Cursor.Position.Y;
            chushix = this.Location.X;
            chushiy = this.Location.Y;
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isok)
            {
                movex = Cursor.Position.X;
                movey = Cursor.Position.Y;
                this.Location = new Point(chushix + movex - dianxiaqux, chushiy + movey - dianxiaquy);
            }
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            isok = false;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button7_Click(object sender, EventArgs e)
        {
           
        }

        private void button7_Click_1(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }
        Image im;
        private int i = 1;
        private void button8_Click(object sender, EventArgs e)
        {
            if (i == 0)
            {
                this.im = Image.FromFile("5.jpg");
                this.BackgroundImage = im;
            }
            else if(i == 1)
            {
                this.im = Image.FromFile("2.jpg");
                this.BackgroundImage = im;
            }
             else if(i == 2)
            {
                this.im = Image.FromFile("3.jpg");
                this.BackgroundImage = im;
               
            }
            else if (i == 3)
            {
                this.im = Image.FromFile("4.jpg");
                this.BackgroundImage = im;
            }
            else if (i == 4)
            {
                this.im = Image.FromFile("5.jpg");
                this.BackgroundImage = im;
            }
            else 
            {
                this.im = Image.FromFile("1.jpg");
                this.BackgroundImage = im;
                i = 0;
             }
           
              i++;
        }

        private void button9_Click(object sender, EventArgs e)
        {
           
        }
        string pic;
        private void button9_Click_1(object sender, EventArgs e)
        {
            
           
        }
        SoftReg softReg = new SoftReg();
        private void Form1_Load(object sender, EventArgs e) //在页面加载的时候判断软件是否注册
        {
            //判断软件是否注册
            RegistryKey retkey = Registry.CurrentUser.OpenSubKey("SOFTWARE", true).CreateSubKey("mySoftWare").CreateSubKey("Register.INI");
            foreach (string strRNum in retkey.GetSubKeyNames())
            {
                if (strRNum == softReg.GetRNum())
                {
                    this.label1.Text = "此软件已注册！";
                    this.btnReg.Enabled = false;
                    return;
                }
            }
            this.label1.Text = "此软件尚未注册！";
            this.btnReg.Enabled = true;
            MessageBox.Show("您现在使用的是试用版，可以免费试用30次！", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            Int32 tLong;    //已使用次数
            try
            {
                tLong = (Int32)Registry.GetValue("HKEY_LOCAL_MACHINE\SOFTWARE\mySoftWare", "UseTimes", 0);
                MessageBox.Show("您已经使用了" + tLong + "次！", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception)
            {
                MessageBox.Show("欢迎使用本软件！", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                Registry.SetValue("HKEY_LOCAL_MACHINE\SOFTWARE\mySoftWare", "UseTimes", 0, RegistryValueKind.DWord);
            }
            //判断是否可以继续试用
            tLong = (Int32)Registry.GetValue("HKEY_LOCAL_MACHINE\SOFTWARE\mySoftWare", "UseTimes", 0);
            if (tLong < 30)
            {
                int tTimes = tLong + 1;
                Registry.SetValue("HKEY_LOCAL_MACHINE\SOFTWARE\mySoftWare", "UseTimes", tTimes);

            }
            else
            {
                DialogResult result = MessageBox.Show("试用次数已到！您是否需要注册？", "信息", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
                if (result == DialogResult.Yes)
                {
                    //FormRegister.state = false; //设置软件状态为不可用
                    btnReg_Click(sender, e);    //打开注册窗口
                }
                else
                {
                    Application.Exit();
                }
            }
        }

        private void btnReg_Click(object sender, EventArgs e)
        {
            FormRegister frmRegister = new FormRegister();
            frmRegister.ShowDialog();
        }

        //这是为了打开添加附件的窗口，从而获得选择的附件的路径
     
    }
}