发送邮件小程序（支持群发，附件）代码,CSharp代码库,德仔网

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【CSharp】发送邮件小程序（支持群发，附件）
作者:dezai / 发布于2014/5/21/ 476

	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。
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