在这里，主要使用了system.web.mail命名空间下的类，具体代码如下：
先新建win项目，再复制：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Web;
using System.Web.Mail;
using System.Text;
using System.Text.RegularExpressions;
namespace SendMail
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.RichTextBox richTextBox1;
private System.Windows.Forms.Label fromlabel;
private System.Windows.Forms.Label subjectlabel;
private System.Windows.Forms.Label tolabel;
private System.Windows.Forms.Button sendbtn;
private System.Windows.Forms.TextBox frombox;
private System.Windows.Forms.TextBox subjectbox;
private System.Windows.Forms.TextBox tobox;
private System.Windows.Forms.Button exitbtn;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.LinkLabel linkLabel1;
private System.Windows.Forms.TextBox Attachmentbox;
/// <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 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.frombox = new System.Windows.Forms.TextBox();
this.fromlabel = new System.Windows.Forms.Label();
this.subjectlabel = new System.Windows.Forms.Label();
this.tolabel = new System.Windows.Forms.Label();
this.subjectbox = new System.Windows.Forms.TextBox();
this.richTextBox1 = new System.Windows.Forms.RichTextBox();
this.sendbtn = new System.Windows.Forms.Button();
this.tobox = new System.Windows.Forms.TextBox();
this.exitbtn = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.linkLabel1 = new System.Windows.Forms.LinkLabel();
this.Attachmentbox = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// frombox
//
this.frombox.Location = new System.Drawing.Point(120, 32);
this.frombox.Name = "frombox";
this.frombox.Size = new System.Drawing.Size(152, 21);
this.frombox.TabIndex = 0;
this.frombox.Text = "";
//
// fromlabel
//
this.fromlabel.Location = new System.Drawing.Point(16, 32);
this.fromlabel.Name = "fromlabel";
this.fromlabel.Size = new System.Drawing.Size(72, 23);
this.fromlabel.TabIndex = 1;
this.fromlabel.Text = "from";
//
// subjectlabel
//
this.subjectlabel.Location = new System.Drawing.Point(16, 72);
this.subjectlabel.Name = "subjectlabel";
this.subjectlabel.Size = new System.Drawing.Size(64, 23);
this.subjectlabel.TabIndex = 3;
this.subjectlabel.Text = "subject";
//
// tolabel
//
this.tolabel.Location = new System.Drawing.Point(336, 32);
this.tolabel.Name = "tolabel";
this.tolabel.Size = new System.Drawing.Size(48, 23);
this.tolabel.TabIndex = 4;
this.tolabel.Text = "to";
//
// subjectbox
//
this.subjectbox.Location = new System.Drawing.Point(120, 72);
this.subjectbox.Name = "subjectbox";
this.subjectbox.Size = new System.Drawing.Size(408, 21);
this.subjectbox.TabIndex = 2;
this.subjectbox.Text = "";
//
// richTextBox1
//
this.richTextBox1.Location = new System.Drawing.Point(40, 160);
this.richTextBox1.Name = "richTextBox1";
this.richTextBox1.Size = new System.Drawing.Size(648, 248);
this.richTextBox1.TabIndex = 3;
this.richTextBox1.Text = "";
//
// sendbtn
//
this.sendbtn.Location = new System.Drawing.Point(488, 120);
this.sendbtn.Name = "sendbtn";
this.sendbtn.TabIndex = 4;
this.sendbtn.Text = "send";
this.sendbtn.Click += new System.EventHandler(this.sendbtn_Click);
//
// tobox
//
this.tobox.Location = new System.Drawing.Point(392, 32);
this.tobox.Name = "tobox";
this.tobox.Size = new System.Drawing.Size(296, 21);
this.tobox.TabIndex = 1;
this.tobox.Text = "";
//
// exitbtn
//
this.exitbtn.Location = new System.Drawing.Point(600, 120);
this.exitbtn.Name = "exitbtn";
this.exitbtn.TabIndex = 5;
this.exitbtn.Text = "exit";
this.exitbtn.Click += new System.EventHandler(this.exitbtn_Click);
//
// openFileDialog1
//
this.openFileDialog1.Multiselect = true;
//
// linkLabel1
//
this.linkLabel1.Location = new System.Drawing.Point(8, 104);
this.linkLabel1.Name = "linkLabel1";
this.linkLabel1.Size = new System.Drawing.Size(104, 16);
this.linkLabel1.TabIndex = 6;
this.linkLabel1.TabStop = true;
this.linkLabel1.Text = "Add Attachment";
this.linkLabel1.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);
//
// Attachmentbox
//
this.Attachmentbox.Location = new System.Drawing.Point(120, 104);
this.Attachmentbox.Name = "Attachmentbox";
this.Attachmentbox.Size = new System.Drawing.Size(264, 21);
this.Attachmentbox.TabIndex = 7;
this.Attachmentbox.Text = "";
this.Attachmentbox.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(728, 454);
this.Controls.Add(this.Attachmentbox);
this.Controls.Add(this.linkLabel1);
this.Controls.Add(this.exitbtn);
this.Controls.Add(this.tobox);
this.Controls.Add(this.sendbtn);
this.Controls.Add(this.richTextBox1);
this.Controls.Add(this.subjectbox);
this.Controls.Add(this.tolabel);
this.Controls.Add(this.subjectlabel);
this.Controls.Add(this.fromlabel);
this.Controls.Add(this.frombox);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
// validate mail expresion
private bool checkEmail( string dataToCheck )
{
string reguEmail = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
return Regex.IsMatch( dataToCheck, reguEmail, RegexOptions.IgnoreCase );
}
private void sendbtn_Click(object sender, System.EventArgs e)
{
//convert to array
string[]maillist = tobox.Text.Split(',');
//trim string in maillist
for(int i=0;i<maillist.Length;i++)
maillist[i] = maillist[i].Trim();
string Attachmentpath = openFileDialog1.FileName;
//send all mails
foreach(string tomail in maillist)
SendMail(frombox.Text, tomail,Attachmentpath);
}
void SendMail(string frommail,string tomail,string Attachmentpath)
{
//whether mail expresion is valid
if(checkEmail(frommail)&&checkEmail(tomail))
{
try
{
//initialize Mailmessage object
MailMessage message = new MailMessage();
message.Subject = subjectbox.Text;
message.From = frommail;
message.To = tomail;
message.Body = richTextBox1.Text;
//real send method
message.Attachments.Add(new MailAttachment(Attachmentpath,MailEncoding.Base64));
SmtpMail.Send ( message ) ;
//show mail succeeded
MessageBox.Show( "Email has sent to ->" + tobox.Text ) ;
}
catch(Exception er)
{
MessageBox.Show("error:"+er.Message);
}
}
else
MessageBox.Show("error:wrong email expresion!");
}
private void exitbtn_Click(object sender, System.EventArgs e)
{
Application.Exit();
}
private void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
{
openFileDialog1.ShowDialog();
Attachmentbox.Text = openFileDialog1.FileName;
}
private void textBox1_TextChanged(object sender, System.EventArgs e)
{
}
}
}
关键点：
1 首先使用验证输入的验证邮件格式是否正确，使用了正则表达式，还可以使用errorprovidor，不过我没用过。
2 使用MailMessage类，初始化它的几个属性，非常简单。具体详见msdn
3 使用MailMessage.Attachment.add()方法添加附件
4 今天第一次使用openfileDialogue，原来是要某个链接激活打开的。具体看代码。不过在实现多个附件的话，处理比较复杂，我就没用了。
