开发电子邮件应用程序示例代码

最新推荐文章于 2021-02-26 04:29:14 发布

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本文介绍了一个使用 C# 开发的电子邮件应用程序示例，该应用利用 System.Web.Mail 命名空间来实现邮件发送功能，并详细展示了如何设置发件人、收件人、抄送人等邮件属性。

开发电子邮件应用程序示例

开发前需要引入一个dll文件System.Web.Mail

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;

namespace SendMail

{

/// <summary>

/// Summary description for frmSendMail.

/// </summary>

public class frmSendMail : System.Windows.Forms.Form

{

private System.Windows.Forms.Button btnRemove;

private System.Windows.Forms.ListBox lstFiles;

private System.Windows.Forms.Label lblSMTP;

private System.Windows.Forms.Label lblSubject;

private System.Windows.Forms.Label lblBcc;

private System.Windows.Forms.Label lblCc;

private System.Windows.Forms.Label lblTo;

private System.Windows.Forms.Label lblFrom;

private System.Windows.Forms.TextBox txtSubject;

private System.Windows.Forms.TextBox txtBcc;

private System.Windows.Forms.TextBox txtCc;

private System.Windows.Forms.TextBox txtTo;

private System.Windows.Forms.TextBox txtFrom;

private System.Windows.Forms.TextBox txtIP;

private System.Windows.Forms.Button txtAttach;

private System.Windows.Forms.Button btnSend;

private System.Windows.Forms.RichTextBox txtBody;

private System.Windows.Forms.OpenFileDialog ofdAttach;

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.Container components = null;

//Create a message object to contain a complete email.

private MailMessage message;

public frmSendMail()

{

// Required for Windows Form Designer support

InitializeComponent();

// TODO: Add any constructor code after InitializeComponent call

//Initialize the message object

message=new MailMessage();

}

/// <summary>

/// Clean up any resources being used.

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

base.Dispose( disposing );

}

Windows Form Designer generated code

/// <summary>

/// The main entry point for the application.

/// </summary>

[STAThread]

static void Main()

{

Application.Run(new frmSendMail());

}

//Compose the email and then send it

private void btnSend_Click(object sender, System.EventArgs e)

{

//Check if SMTP Server IP address is specified.

//If yes, compose email

//else display appropriate message

if (txtIP.Text.Length >0)

{

//Specify the SMTP server to use

//to send emails

SmtpMail.SmtpServer =txtIP.Text.Trim() ;

//Compose email

message.From =txtFrom.Text ;

message.To =txtTo.Text ;

message.Cc =txtCc.Text ;

message.Bcc =txtBcc.Text ;

message.Subject =txtSubject.Text ;

message.Body=txtBody.Text;

//Add attachements to the email if any

message.Attachments.Clear();

for(int index=0;index<lstFiles.Items.Count;index++)

{

MailAttachment mAttach=new MailAttachment(lstFiles.Items[index].ToString());

message.Attachments.Add(mAttach);

}

try

{

MessageBox.Show (message.From.ToString());

MessageBox.Show (message.To.ToString());

MessageBox.Show (message.Subject.ToString());

//Send the composed email

SmtpMail.Send(message.From,message.To,message.Subject,message.Body);

//Reset the form

txtFrom.Text="";

txtTo.Text="";

txtCc.Text="";

txtBcc.Text="";

txtSubject.Text="";

txtBody.Text="";

lstFiles.Items.Clear();

}

catch (Exception excep)

{

MessageBox.Show(excep.Message.ToString() );

MessageBox.Show(excep.StackTrace.ToString() );

//Display appropriate message if

//From address is invalid

//MessageBox.Show("Enter a valid From email address");

return;

}

//Visually indicate that the email was sent

MessageBox.Show("您的邮件已发送");

}

else

{

MessageBox.Show("请输入 SMTP 服务器 IP 地址");

}

private void txtAttach_Click(object sender, System.EventArgs e)

{

//Display a dialog box to select

//files to attach to the email.

//Once selected, display the selected

//files in a listbox

if(ofdAttach.ShowDialog()==DialogResult.OK)

{

string [] files=new string[ofdAttach.FileNames.Length];

for(int index=0;index<ofdAttach.FileNames.Length;index++)

{

lstFiles.Items.Add(ofdAttach.FileNames[index].ToString());

}

private void btnRemove_Click(object sender, System.EventArgs e)

{

//Remove the selected attachment from the list

lstFiles.Items.RemoveAt(lstFiles.SelectedIndex);

}

private void frmSendMail_Load(object sender, EventArgs e)

{

}

开发电子邮件应用程序示例 代码

开发电子邮件应用程序示例代码