发送邮件

图1  “发送邮件”窗体       图2  提示信息
using System.Web.Mail;
using System.IO;
using System.Net;
private void button1_Click(object sender, EventArgs e)
{
    try
    {
        System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage();
        mail.From = txtFrom.Text.Trim();
        mail.To = txtGet.Text.Trim();
        mail.Subject = Base64Encode(txtSubject.Text);
           mail.Body = Base64Encode(richTextBox1.Text);
           mail.BodyFormat = MailFormat.Text;
           SmtpMail.SmtpServer = txtServer.Text.Trim();
           SmtpMail.Send(mail);
           MessageBox.Show("邮件成功发送到" + txtGet.Text);
       }
       catch (Exception ex)
       {
           MessageBox.Show(ex.ToString());
       }
}        
  注意：MailMessage类还提供群发功能以及发送附件（通过Attachments类）的功能。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
using System.Net.Mail;
using System.IO;
using System.Net;
using System.Web.Mail;
 
namespace Ex16_08
{
    public partial class Send_mal : Form
    {
        public Send_mal()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            
        }
        public static string Base64Encode(string str)
        {
            return Convert.ToBase64String(Encoding.UTF8.GetBytes(str));
        }
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage();
                mail.From = txtFrom.Text.Trim();
                mail.To = txtGet.Text.Trim();
                mail.Subject = Base64Encode(txtSubject.Text);
                mail.Body = Base64Encode(richTextBox1.Text);
                mail.BodyFormat = MailFormat.Text;
                SmtpMail.SmtpServer = txtServer.Text.Trim();
                SmtpMail.Send(mail);
                MessageBox.Show("邮件成功发送到" + txtGet.Text);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}
namespace Ex16_08
{
    partial class Send_mal
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;
 
        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
 
        #region Windows 窗体设计器生成的代码
 
        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.txtFrom = new System.Windows.Forms.TextBox();
            this.txtGet = new System.Windows.Forms.TextBox();
            this.txtSubject = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.richTextBox1 = new System.Windows.Forms.RichTextBox();
            this.label4 = new System.Windows.Forms.Label();
            this.txtServer = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(286, 94);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "发送";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // txtFrom
            // 
            this.txtFrom.Location = new System.Drawing.Point(67, 39);
            this.txtFrom.Name = "txtFrom";
            this.txtFrom.Size = new System.Drawing.Size(294, 21);
            this.txtFrom.TabIndex = 1;
            // 
            // txtGet
            // 
            this.txtGet.Location = new System.Drawing.Point(67, 67);
            this.txtGet.Name = "txtGet";
            this.txtGet.Size = new System.Drawing.Size(294, 21);
            this.txtGet.TabIndex = 2;
            // 
            // txtSubject
            // 
            this.txtSubject.Location = new System.Drawing.Point(67, 94);
            this.txtSubject.Name = "txtSubject";
            this.txtSubject.Size = new System.Drawing.Size(215, 21);
            this.txtSubject.TabIndex = 3;
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(8, 70);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(53, 12);
            this.label1.TabIndex = 4;
            this.label1.Text = "收件人：";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(8, 42);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(53, 12);
            this.label2.TabIndex = 5;
            this.label2.Text = "发件人：";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(20, 97);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(41, 12);
            this.label3.TabIndex = 6;
            this.label3.Text = "主题：";
            // 
            // richTextBox1
            // 
            this.richTextBox1.Location = new System.Drawing.Point(4, 121);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(357, 155);
            this.richTextBox1.TabIndex = 7;
            this.richTextBox1.Text = "";
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(8, 16);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(53, 12);
            this.label4.TabIndex = 8;
            this.label4.Text = "服务器：";
            // 
            // txtServer
            // 
            this.txtServer.Location = new System.Drawing.Point(67, 13);
            this.txtServer.Name = "txtServer";
            this.txtServer.Size = new System.Drawing.Size(294, 21);
            this.txtServer.TabIndex = 9;
            // 
            // Send_mal
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(364, 284);
            this.Controls.Add(this.txtServer);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.richTextBox1);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.txtSubject);
            this.Controls.Add(this.txtGet);
            this.Controls.Add(this.txtFrom);
            this.Controls.Add(this.button1);
            this.Name = "Send_mal";
            this.Text = "sendMail";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();
 
        }
 
        #endregion
 
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox txtFrom;
        private System.Windows.Forms.TextBox txtGet;
        private System.Windows.Forms.TextBox txtSubject;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.RichTextBox richTextBox1;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.TextBox txtServer;
    }
}
 
using System;
using System.Collections.Generic;
using System.Windows.Forms;
 
namespace Ex16_08
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Send_mal());
        }
    }
}