C#、.NET版邮件（群）发系统

 

这个小程序是之前做的，今天把它晾上来了。程序比较简单，，适合初学者学习。先给个截图：

实现单发和多发功能，可附加多份附件，限制总大小为1M，大于后无法发送。

默认发送格式为Html。

【修改】【添加】的操作是针对发件人的，点击【修改】弹出下图界面：

填充文本框的是在ThreadSendEmail.cs中的构造函数中

        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="strSenderEmail">发件人邮箱</param>
        /// <param name="strTitle">邮件标题</param>
        /// <param name="strBody">邮件正文</param>
        /// <param name="ToEmail">收件人邮箱</param>
        /// <param name="AttachmentFiles">附件</param>
        public ThreadSendEmail(string strSenderEmail, string strTitle, string strBody, string ToEmail, ArrayList AttachmentFiles)
        {
            this.strSenderEmail = strSenderEmail;
            strToEmail = ToEmail;
            strEmailTitle = strTitle;
            strEmailBody = strBody;
            arrAttachmentFiles = AttachmentFiles;

            using (FileStream stream = new FileStream(inforpath, FileMode.OpenOrCreate, FileAccess.Read))
            {
                using (StreamReader read = new StreamReader(stream, Encoding.Default))
                {
                    string GetSenderInfor;
                    while ((GetSenderInfor = read.ReadLine()) != null)
                    {
                        string[] line = GetSenderInfor.Trim().Split(' ');
                        if (line[1] == strSenderEmail)
                        {
                            strSenderSMTP = line[0];
                            strSnederPwd = line[2];
                        }
                    }
                }
            }
        }

　　

当然，点击【添加】文本框中是没有内容的。

下面的函数是发送邮件函数

/// <summary>
        /// 发送邮件
        /// </summary>
        /// <returns>true:发送成功 false:发送失败</returns>
        public bool Send()
        {
            SmtpClient client = new SmtpClient();
            client.Host = strSenderSMTP;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(strSenderEmail, strSnederPwd);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;

            MailMessage mm = new MailMessage(strSenderEmail, strToEmail, strEmailTitle, strEmailBody);
            mm.BodyEncoding = Encoding.Default;
            mm.IsBodyHtml = true;

            if (arrAttachmentFiles.Count != 0)
            {
                foreach (string attach in arrAttachmentFiles)
                {
                    Attachment attachment = new Attachment(attach, System.Net.Mime.MediaTypeNames.Application.Octet);
                    mm.Attachments.Add(attachment);
                }
            }

            try
            {
                client.Send(mm);
                MessageBox.Show("邮件发送成功", "成功", MessageBoxButtons.OK);
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("发送失败" + ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return false;
            }
        }

若为修改时，点击添加、修改发件人对话框确定按钮，程序将清空txt然后重新写入。具体代码为

private void btnOK_Click(object sender, EventArgs e)
        {
            NewInforLine = txtSMTP.Text + " " + txtSenderEmail.Text + " " + txtSenderPwd.Text;
            Regex regex = new Regex(@"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"); //验证Email格式
            if (regex.IsMatch(txtSenderEmail.Text.Trim()) && txtSenderPwd.Text.Trim() != "")
            {
                if (arg) //修改发件人
                {
                    string[] content;
                    string[] content1;
                    try
                    {
                        content = File.ReadAllLines(PathBase + inforpath, Encoding.Default);
                        content1 = new string[content.Length];
                        for (int i = 0; i < content.Length; i++)
                        {
                            if (content[i] != OldInforLine)
                            {
                                content1[i] = content[i];
                                continue;
                            }
                            content1[i] = NewInforLine;
                        }

                        FileStream stream2 = File.Open(inforpath, FileMode.OpenOrCreate, FileAccess.Write);
                        stream2.Seek(0, SeekOrigin.Begin);
                        stream2.SetLength(0); //清空txt文件
                        stream2.Close();
                        File.WriteAllLines(PathBase + inforpath, content1);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
                else //添加发件人
                {
                    using (FileStream stream = new FileStream(inforpath, FileMode.Append, FileAccess.Write))
                    {
                        using (StreamWriter write = new StreamWriter(stream, Encoding.Default))
                        {
                            string stremail = txtSMTP.Text + " " + txtSenderEmail.Text + " " + txtSenderPwd.Text;
                            write.WriteLine(stremail);
                        }
                    }
                }
                ClearContent();
                this.DialogResult = System.Windows.Forms.DialogResult.OK;
            }
            else
            {
                MessageBox.Show("邮箱格式不正确", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                this.DialogResult = System.Windows.Forms.DialogResult.None;
            }
        }

 

程序结构：

添加收件人按钮弹出

 

适合初学者，程序里面有注解，比较容易懂。

 

源码下载