邮件添加附件

转载自 http://blog.163.com/china__xuhua/blog/static/199723169201243010111517/

1、功能简介

    本实例实现了邮件、附件的发送。支持：1、一对多，即支持可以同时对多个用户发送邮件；2、支持可以同时发送多个附件。

 

2、页面效果图

 

3、后台代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net.Mail;
using System.Net;
using System.Net.Mime;

namespace SmtpEmail
{
    public partial class Form1 : Form
    {
        #region 构造函数
        public Form1()
        {
            InitializeComponent();
        }
        #endregion

        #region 收件邮箱地址
        //邮箱地址添加到GridView中
        private void btnEmailAdd_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(this.txtEamilFrom.Text.Trim()))
            {
                if (this.txtEamilFrom.ForeColor == Color.Red)
                {
                    MessageBox.Show("输入的收件箱格式不正确！");
                }
                else
                {
                    int vRownumber = this.grdEmails.Rows.Add();
                    this.grdEmails.Rows[vRownumber].Cells[0].Value = this.txtEamilFrom.Text.Trim();
                    this.txtEamilFrom.Text = string.Empty;
                }
            }
        }

        //邮箱地址 删除
        private void btnRemove_Click(object sender, EventArgs e)
        {
            if (this.grdEmails.Rows.Count > 0)
            {
                //只可选中一条，进行删除
                //int vCurrentIndex = this.grdEmails.CurrentRow.Index;
                //this.grdEmails.Rows.RemoveAt(vCurrentIndex);

                //支持多选删除
                foreach (DataGridViewRow vrow in grdEmails.SelectedRows)
                {
                    int vIndex = vrow.Index;
                    this.grdEmails.Rows.RemoveAt(vIndex);
                }

            }
        }

        //邮箱地址 清空
        private void btnClear_Click(object sender, EventArgs e)
        {
            this.grdEmails.Rows.Clear();
        }
        #endregion

        #region 验证邮箱输入是否正确，不正确是，字体显示为红色
        //验证 发件邮箱是否正确
        private void txtEmailTo_Leave(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(this.txtEmailTo.Text.Trim()))
            {
                bool a = IsEmail(this.txtEmailTo.Text);
                //如果不为 邮箱，字体变为红色
                if (IsEmail(this.txtEmailTo.Text.Trim()) == false)
                {
                    this.txtEmailTo.ForeColor = Color.Red;
                }
                else
                {
                    this.txtEmailTo.ForeColor = Color.Black;
                }
            }
        }

        private bool IsEmail(string vEmail)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(vEmail, @"^([w-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([w-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$");
        }

        //验证 受件箱邮箱是否正确
        private void txtEamilFrom_Leave(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(this.txtEamilFrom.Text.Trim()))
            {
                bool a = IsEmail(this.txtEamilFrom.Text);
                //如果不为 邮箱，字体变为红色
                if (IsEmail(this.txtEamilFrom.Text.Trim()) == false)
                {
                    this.txtEamilFrom.ForeColor = Color.Red;
                }
                else
                {
                    this.txtEamilFrom.ForeColor = Color.Black;
                }
            }
        }
        #endregion

        #region 参数
       
        private string [] Files;//保存 附件文件路径
        private SmtpClient vSmtpClient = null;//设置SMTP协议
        private MailAddress vMailAddressFrom = null;//设置发件人地址，需要密码
        private MailAddress vMailAddressTo = null;//设置收件人地址，不需要密码
        private FileStream vFileStream = null;//附件文件流vMailAddressFrom
        private MailMessage vMailMessage = null;

        #endregion
        
        #region 选择文件(支持多选，可以同时上传多个附件)
        
        private void btnFileSelect_Click(object sender, EventArgs e)
        {
            OpenFileDialog vOpenSelectFile = new OpenFileDialog();
            vOpenSelectFile.Multiselect = true;
            vOpenSelectFile.Filter = "全部文件|*.*|Excel文件|*.xlsx;*.xls|Csv文件|*.csv";
            vOpenSelectFile.FilterIndex = 2;
            vOpenSelectFile.RestoreDirectory = true;
            if (vOpenSelectFile.ShowDialog() == DialogResult.OK)
            {
                this.txtFile.Text = vOpenSelectFile.FileNames[0].ToString();
                Files = new string[vOpenSelectFile.FileNames.Length];//实例化 Files，用以保存文件附近信息
                for (int i = 0; i < vOpenSelectFile.FileNames.Length; i++)
                {
                    Files[i] = vOpenSelectFile.FileNames[i].ToString();
                }
            }
        }
        
        #endregion

        #region 验证页面必填项是否已经完善
        private bool CheckPage()
        {
            if (string.IsNullOrEmpty(this.comServer.Text))
            {
                MessageBox.Show("请输入SMTP服务器名称","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);
                return false;
            }
            else if (string.IsNullOrEmpty(this.numberPort.Value.ToString()))
            {
                MessageBox.Show("请输入SMTP服务器端口", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }
            else if (string.IsNullOrEmpty(this.txtEmailTo.Text))
            {
                MessageBox.Show("请输入发件人邮箱地址", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }
            else if (string.IsNullOrEmpty(this.txtformPwd.Text))
            {
                MessageBox.Show("请输入发件人邮箱密码", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }
            else if (this.grdEmails.Rows.Count < 1)
            {
                MessageBox.Show("请输入收件人邮箱地址", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }
            else if (string.IsNullOrEmpty(this.txtEmailtitle.Text))
            {
                MessageBox.Show("请输入邮件标题", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return false;
            }

            return true;
        }
        #endregion

        #region 邮件发送

        //设置SMTP服务器信息
        private void SetSmtpClient(string vServerHost,int vPort)
        {
            vSmtpClient = new SmtpClient();
            vSmtpClient.Host = vServerHost;//SMTP服务器的名称
            vSmtpClient.Port = vPort;//指定端口号
            vSmtpClient.Timeout = 0;//超时时间
        }

        //验证发件人信息
        private void SetAddressForm(string vMailAddress, string vMailPwd)
        {
            //创建服务器认证
            NetworkCredential vNetwork = new NetworkCredential(vMailAddress, vMailPwd);
            //实例化 发件人地址
            vMailAddressFrom = new MailAddress(vMailAddress, "");
            //指定发件人信息，包括邮箱地址和邮箱密码
            vSmtpClient.Credentials = new NetworkCredential(vMailAddressFrom.Address, vMailPwd);
        }

        //检测附件大小
        private bool Check_File(string vFilePath,out string vInfo)
        {
            vFileStream = new FileStream(vFilePath, FileMode.Open);
            string vFileName = vFileStream.Name;
            int vSize = Convert.ToInt32(vFileStream.Length / 1024 / 1024);
            vFileStream.Close();
            if (vSize > 15)
            {
                vInfo = "文件名为：" + vFileName + "的文件大小大于15M，允许上传。";
                return false;
            }
            vInfo = string.Empty;
            return true;
        }

        //发送
        private void btnSaveTo_Click(object sender, EventArgs e)
        {
            if (CheckPage())//必填项验证通过
            {
                //初始化Smtp服务器信息
                SetSmtpClient("Smtp." + this.comServer.Text.Trim(), Convert.ToInt32(this.numberPort.Value));

                //验证发件邮箱地址和密码
                SetAddressForm(this.txtEmailTo.Text.Trim(), this.txtformPwd.Text.Trim());

                vMailMessage = new MailMessage();

                //添加收件人邮箱地址
                foreach (DataGridViewRow vRow in grdEmails.Rows)
                {
                    vMailAddressTo = new MailAddress(vRow.Cells[0].Value.ToString().Trim());
                    vMailMessage.To.Add(vMailAddressTo);
                }

                //发件人邮箱
                vMailMessage.From = vMailAddressFrom;

                //邮件主题
                vMailMessage.Subject = this.txtEmailtitle.Text.Trim();
                vMailMessage.SubjectEncoding = System.Text.Encoding.UTF8;//字体使用的编码

                //邮件正文
                vMailMessage.Body = this.txtEmailBody.Text.Trim();
                vMailMessage.BodyEncoding = System.Text.Encoding.UTF8;

                //清空历史附件，以防附件重复发送
                vMailMessage.Attachments.Clear();

                //添加附件
                for (int i = 0; i < Files.Length; i++)
                {
                    vMailMessage.Attachments.Add(new Attachment(Files[i].Trim().ToString(), MediaTypeNames.Application.Octet));
                }
                
                //注册邮件发送完毕后的处理事件
                vSmtpClient.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);

                //开始发送邮件
                vSmtpClient.SendAsync(vMailMessage,"000000000");
            }
        }

        //发送邮件后所处理的函数
        private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
        {
            try
            {
                if (e.Cancelled)
                {
                    MessageBox.Show("发送已取消！");
                }
                if (e.Error != null)
                {
                    MessageBox.Show("邮件发送失败！" + " " + "技术信息: " +"请验证，发件邮箱和密码是否正确！"+ e.ToString(), "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                else
                {
                    MessageBox.Show("邮件成功发出!", "恭喜!", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch (Exception Ex)
            {
                MessageBox.Show("邮件发送失败！" + " " + "技术信息: " + Ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }  
        }
        #endregion

    }
}

//释放被占用的资源

   foreach (Attachment item in MailMessage_Mai.Attachments)
                        {
                            item.Dispose();
                        }