利用.net发送电子邮件

作者：网际浪子

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Web.Mail;

namespace 利用.Net类库发送电子邮件
{
    /// <summary> 
    /// Form1 的摘要说明。 
    /// </summary> 
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.OpenFileDialog openFileDialog1;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox textBox4;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.TextBox textBox5;
        /// <summary> 
        /// 必需的设计器变量。 
        /// </summary> 
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            // 
            // Windows 窗体设计器支持所必需的 
            // 
            InitializeComponent();

            // 
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 
            // 
        }

        /// <summary> 
        /// 清理所有正在使用的资源。 
        /// </summary> 
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code 
        /// <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.button2 = new System.Windows.Forms.Button();
            this.textBox4 = new System.Windows.Forms.TextBox();
            this.label4 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.label3 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label1 = new System.Windows.Forms.Label();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox5 = new System.Windows.Forms.TextBox();
            this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
            this.SuspendLayout();
            // 
            // button2 
            // 
            this.button2.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
            this.button2.Location = new System.Drawing.Point(200, 114);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(66, 28);
            this.button2.TabIndex = 19;
            this.button2.Text = "添加附件";
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // textBox4 
            // 
            this.textBox4.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.textBox4.Location = new System.Drawing.Point(72, 116);
            this.textBox4.Name = "textBox4";
            this.textBox4.Size = new System.Drawing.Size(122, 21);
            this.textBox4.TabIndex = 17;
            this.textBox4.Text = "";
            // 
            // label4 
            // 
            this.label4.Font = new System.Drawing.Font("宋体", 9F);
            this.label4.Location = new System.Drawing.Point(18, 116);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(62, 18);
            this.label4.TabIndex = 20;
            this.label4.Text = "附　件：";
            // 
            // button1 
            // 
            this.button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
            this.button1.Location = new System.Drawing.Point(106, 286);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(92, 27);
            this.button1.TabIndex = 21;
            this.button1.Text = "发送邮件";
            this.button1.Click += new System.EventHandler(this.SendButton_Click);
            // 
            // label3 
            // 
            this.label3.Font = new System.Drawing.Font("宋体", 9F);
            this.label3.Location = new System.Drawing.Point(18, 84);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(62, 18);
            this.label3.TabIndex = 22;
            this.label3.Text = "主　题：";
            // 
            // label2 
            // 
            this.label2.Font = new System.Drawing.Font("宋体", 9F);
            this.label2.Location = new System.Drawing.Point(18, 52);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(62, 18);
            this.label2.TabIndex = 23;
            this.label2.Text = "收信人：";
            // 
            // label1 
            // 
            this.label1.Font = new System.Drawing.Font("宋体", 9F);
            this.label1.Location = new System.Drawing.Point(18, 22);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(62, 18);
            this.label1.TabIndex = 24;
            this.label1.Text = "发信人：";
            // 
            // textBox3 
            // 
            this.textBox3.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.textBox3.Location = new System.Drawing.Point(72, 82);
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(174, 21);
            this.textBox3.TabIndex = 16;
            this.textBox3.Text = "";
            // 
            // textBox2 
            // 
            this.textBox2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.textBox2.Location = new System.Drawing.Point(72, 48);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(174, 21);
            this.textBox2.TabIndex = 15;
            this.textBox2.Text = "";
            // 
            // textBox1 
            // 
            this.textBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.textBox1.Location = new System.Drawing.Point(72, 14);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(174, 21);
            this.textBox1.TabIndex = 14;
            this.textBox1.Text = "";
            // 
            // textBox5 
            // 
            this.textBox5.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.textBox5.Location = new System.Drawing.Point(10, 154);
            this.textBox5.Multiline = true;
            this.textBox5.Name = "textBox5";
            this.textBox5.Size = new System.Drawing.Size(276, 108);
            this.textBox5.TabIndex = 18;
            this.textBox5.Text = "";
            // 
            // openFileDialog1 
            // 
            this.openFileDialog1.Title = "选择附件：";
            // 
            // Form1 
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(300, 335);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                        this.button2,
                                        this.textBox4,
                                        this.button1,
                                        this.textBox3,
                                        this.textBox2,
                                        this.textBox1,
                                        this.textBox5,
                                        this.label4,
                                        this.label3,
                                        this.label2,
                                        this.label1});
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Name = "Form1";
            this.Text = "利用.Net类库发送电子邮件";
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary> 
        /// 应用程序的主入口点。 
        /// </summary> 
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private void SendButton_Click(object sender, System.EventArgs e)
        {
            try
            {
                MailMessage Message = new MailMessage();
                //新建一个MailMessage对象 
                Message.From = textBox1.Text;
                //定义发信人地址 
                Message.To = textBox2.Text;
                //定义收信人地址，如果是多人，可以用“，”分开 
                Message.Subject = textBox3.Text;
                //定义邮件的主题 
                Message.Body = textBox4.Text;
                //定义邮件的内容 
                if (openFileDialog1.FileName != "")
                {
                    MailAttachment Attachment = new MailAttachment(openFileDialog1.FileName, MailEncoding.Base64);
                    //以Base64编码创建一个附件实例 
                    Message.Attachments.Add(Attachment);
                    //给邮件增加附件 
                }
                //判断要发送的邮件是否有附件，如果有则加入 
                SmtpMail.Send(Message);
                //发送电子邮件 
                MessageBox.Show("电子邮件已经发送到->" + textBox2.Text);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
        }

        private void button2_Click(object sender, System.EventArgs e)
        {
            openFileDialog1.ShowDialog();
            //显示附件选择对话框 
            textBox4.Text = openFileDialog1.FileName;
        }
    }
}