C#实现SMTP邮件附件发送功能详解
作者：芝麻粒儿 发布时间：2022-08-14 10:09:38
标签：C#,SMTP,邮件,发送
实践过程
效果
代码
public partial class frmSend : Form
{
public frmSend()
{
InitializeComponent();
}
//对邮件内容进行编码
private static string Base64Encode(string str)
{
return Convert.ToBase64String(Encoding.UTF8.GetBytes(str));
}
private void AddFile(string strFile,MailMessage message)
{
//为要发送的邮件创建附件信息
Attachment myAttachment = new Attachment(strFile, System.Net.Mime.MediaTypeNames.Application.Octet);
//为附件添加时间信息
System.Net.Mime.ContentDisposition disposition = myAttachment.ContentDisposition;
disposition.CreationDate = System.IO.File.GetCreationTime(strFile);
disposition.ModificationDate = System.IO.File.GetLastWriteTime(strFile);
disposition.ReadDate = System.IO.File.GetLastAccessTime(strFile);
message.Attachments.Add(myAttachment);//将创建的附件添加到邮件中
}
private void SendEmail(MailMessage message)
{
message.Subject = Base64Encode(txtSubject.Text); //设置发送邮件的主题
message.Body = Base64Encode(txtContent.Text); //设置发送邮件的内容
if (txtAttachment.Text != "")
{
if (txtAttachment.Text.IndexOf(",") != 0)
{
string[] strAttachment = txtAttachment.Text.Split(',');
for (int i = 0; i < strAttachment.Length; i++)
{
AddFile(strAttachment[i], message);
}
}
else
{
AddFile(txtAttachment.Text, message);
}
}
//实例化SmtpClient邮件发送类对象
SmtpClient client = new SmtpClient(txtServer.Text, Convert.ToInt32(txtPort.Text));
//设置用于验证发件人身份的凭据
client.Credentials = new System.Net.NetworkCredential(txtName.Text, txtPwd.Text);
//发送邮件
client.Send(message);
}
private void frmSend_Load(object sender, EventArgs e)
{
txtServer.Text = Dns.GetHostName();
}
private void btnSend_Click(object sender, EventArgs e)
{
try
{
if (validateEmail(txtSend.Text))
{
//设置邮件发送人和接收人
MailMessage message = null;
if (txtTo.Text.IndexOf(",") != -1)
{
string[] strEmail = txtTo.Text.Split(',');
string sumEmail = "";
for (int i = 0; i < strEmail.Length; i++)
{
sumEmail = strEmail[i];
message = new MailMessage(new MailAddress(txtSend.Text), new MailAddress(sumEmail));
SendEmail(message);
}
}
else
{
message = new MailMessage(new MailAddress(txtSend.Text), new MailAddress(txtTo.Text));
SendEmail(message);
}
MessageBox.Show("发送成功");
}
}
catch
{
MessageBox.Show("发送失败!");
}
}
private void btnSelect_Click(object sender, EventArgs e)
{
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
if (txtAttachment.Text == "")
{
txtAttachment.Text = openFileDialog.FileName;
}
else
{
txtAttachment.Text += "," + openFileDialog.FileName;
}
}
}
private void frmSend_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult = DialogResult.OK;
}
#region 验证输入为Email
/// <summary>
/// 验证输入为Email
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static bool validateEmail(string str)
{
return Regex.IsMatch(str, @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
}
#endregion
}
partial class frmSend
{
/// <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.txtContent = new System.Windows.Forms.TextBox();
this.txtSubject = new System.Windows.Forms.TextBox();
this.txtPort = new System.Windows.Forms.TextBox();
this.txtServer = new System.Windows.Forms.TextBox();
this.txtPwd = new System.Windows.Forms.TextBox();
this.txtName = new System.Windows.Forms.TextBox();
this.txtTo = new System.Windows.Forms.TextBox();
this.txtSend = new System.Windows.Forms.TextBox();
this.label8 = new System.Windows.Forms.Label();
this.label7 = new System.Windows.Forms.Label();
this.label6 = new System.Windows.Forms.Label();
this.label5 = new System.Windows.Forms.Label();
this.label4 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label1 = new System.Windows.Forms.Label();
this.btnSend = new System.Windows.Forms.Button();
this.txtAttachment = new System.Windows.Forms.TextBox();
this.label9 = new System.Windows.Forms.Label();
this.btnSelect = new System.Windows.Forms.Button();
this.openFileDialog = new System.Windows.Forms.OpenFileDialog();
this.SuspendLayout();
//
// txtContent
//
this.txtContent.Location = new System.Drawing.Point(23, 143);
this.txtContent.Multiline = true;
this.txtContent.Name = "txtContent";
this.txtContent.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
this.txtContent.Size = new System.Drawing.Size(519, 100);
this.txtContent.TabIndex = 7;
//
// txtSubject
//
this.txtSubject.Location = new System.Drawing.Point(88, 94);
this.txtSubject.Name = "txtSubject";
this.txtSubject.Size = new System.Drawing.Size(186, 21);
this.txtSubject.TabIndex = 6;
//
// txtPort
//
this.txtPort.Location = new System.Drawing.Point(356, 62);
this.txtPort.Name = "txtPort";
this.txtPort.Size = new System.Drawing.Size(186, 21);
this.txtPort.TabIndex = 5;
//
// txtServer
//
this.txtServer.Location = new System.Drawing.Point(88, 63);
this.txtServer.Name = "txtServer";
this.txtServer.Size = new System.Drawing.Size(186, 21);
this.txtServer.TabIndex = 4;
//
// txtPwd
//
this.txtPwd.Location = new System.Drawing.Point(356, 34);
this.txtPwd.Name = "txtPwd";
this.txtPwd.PasswordChar = '*';
this.txtPwd.Size = new System.Drawing.Size(186, 21);
this.txtPwd.TabIndex = 3;
//
// txtName
//
this.txtName.Location = new System.Drawing.Point(88, 35);
this.txtName.Name = "txtName";
this.txtName.Size = new System.Drawing.Size(186, 21);
this.txtName.TabIndex = 2;
//
// txtTo
//
this.txtTo.Location = new System.Drawing.Point(356, 6);
this.txtTo.Name = "txtTo";
this.txtTo.Size = new System.Drawing.Size(186, 21);
this.txtTo.TabIndex = 1;
//
// txtSend
//
this.txtSend.Location = new System.Drawing.Point(88, 6);
this.txtSend.Name = "txtSend";
this.txtSend.Size = new System.Drawing.Size(186, 21);
this.txtSend.TabIndex = 0;
//
// label8
//
this.label8.AutoSize = true;
this.label8.Location = new System.Drawing.Point(15, 121);
this.label8.Name = "label8";
this.label8.Size = new System.Drawing.Size(65, 12);
this.label8.TabIndex = 12;
this.label8.Text = "邮件内容：";
//
// label7
//
this.label7.AutoSize = true;
this.label7.Location = new System.Drawing.Point(15, 93);
this.label7.Name = "label7";
this.label7.Size = new System.Drawing.Size(65, 12);
this.label7.TabIndex = 11;
this.label7.Text = "邮件主题：";
//
// label6
//
this.label6.AutoSize = true;
this.label6.Location = new System.Drawing.Point(290, 65);
this.label6.Name = "label6";
this.label6.Size = new System.Drawing.Size(53, 12);
this.label6.TabIndex = 14;
this.label6.Text = "端口号：";
//
// label5
//
this.label5.AutoSize = true;
this.label5.Location = new System.Drawing.Point(21, 65);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(53, 12);
this.label5.TabIndex = 17;
this.label5.Text = "服务器：";
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(278, 37);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(77, 12);
this.label4.TabIndex = 16;
this.label4.Text = "发件人密码：";
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(9, 37);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(77, 12);
this.label3.TabIndex = 15;
this.label3.Text = "发件人名称：";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(290, 9);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(53, 12);
this.label2.TabIndex = 13;
this.label2.Text = "收件人：";
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(21, 9);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(53, 12);
this.label1.TabIndex = 18;
this.label1.Text = "发件人：";
//
// btnSend
//
this.btnSend.Location = new System.Drawing.Point(221, 280);
this.btnSend.Name = "btnSend";
this.btnSend.Size = new System.Drawing.Size(116, 23);
this.btnSend.TabIndex = 9;
this.btnSend.Text = "发送";
this.btnSend.UseVisualStyleBackColor = true;
this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
//
// txtAttachment
//
this.txtAttachment.Location = new System.Drawing.Point(62, 250);
this.txtAttachment.Name = "txtAttachment";
this.txtAttachment.Size = new System.Drawing.Size(437, 21);
this.txtAttachment.TabIndex = 28;
//
// label9
//
this.label9.AutoSize = true;
this.label9.Location = new System.Drawing.Point(15, 253);
this.label9.Name = "label9";
this.label9.Size = new System.Drawing.Size(41, 12);
this.label9.TabIndex = 27;
this.label9.Text = "附件：";
//
// btnSelect
//
this.btnSelect.Location = new System.Drawing.Point(505, 249);
this.btnSelect.Name = "btnSelect";
this.btnSelect.Size = new System.Drawing.Size(37, 23);
this.btnSelect.TabIndex = 8;
this.btnSelect.Text = "选择";
this.btnSelect.UseVisualStyleBackColor = true;
this.btnSelect.Click += new System.EventHandler(this.btnSelect_Click);
//
// openFileDialog
//
this.openFileDialog.FileName = "openFileDialog1";
//
// frmSend
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(551, 313);
this.Controls.Add(this.btnSelect);
this.Controls.Add(this.txtAttachment);
this.Controls.Add(this.label9);
this.Controls.Add(this.txtContent);
this.Controls.Add(this.txtSubject);
this.Controls.Add(this.txtPort);
this.Controls.Add(this.txtServer);
this.Controls.Add(this.txtPwd);
this.Controls.Add(this.txtName);
this.Controls.Add(this.txtTo);
this.Controls.Add(this.txtSend);
this.Controls.Add(this.label8);
this.Controls.Add(this.label7);
this.Controls.Add(this.label6);
this.Controls.Add(this.label5);
this.Controls.Add(this.label4);
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Controls.Add(this.btnSend);
this.Name = "frmSend";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "使用SMTP服务发送带附件的邮件";
this.Load += new System.EventHandler(this.frmSend_Load);
this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.frmSend_FormClosing);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.TextBox txtContent;
private System.Windows.Forms.TextBox txtSubject;
private System.Windows.Forms.TextBox txtPort;
private System.Windows.Forms.TextBox txtServer;
private System.Windows.Forms.TextBox txtPwd;
private System.Windows.Forms.TextBox txtName;
private System.Windows.Forms.TextBox txtTo;
private System.Windows.Forms.TextBox txtSend;
private System.Windows.Forms.Label label8;
private System.Windows.Forms.Label label7;
private System.Windows.Forms.Label label6;
private System.Windows.Forms.Label label5;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button btnSend;
private System.Windows.Forms.TextBox txtAttachment;
private System.Windows.Forms.Label label9;
private System.Windows.Forms.Button btnSelect;
private System.Windows.Forms.OpenFileDialog openFileDialog;
}
来源：https://blog.csdn.net/qq_27489007/article/details/128402636
0
投稿猜你喜欢
1.摘要Android手机间通过蓝牙方式进行通信，有两种常见的方式，一种是socket方式，另一种是通过Gatt Server（Androi- 概述关于 static 关键字的使用，它可以用来修饰的成员变量和成员方法，被修饰的成员是属于类的，而不是单单是属 于某个对象的。也就是说，既
- 本文实例讲述了C#使用GDI+创建缩略图的方法，分享给大家供大家参考。具体方法分析如下：C#的Gdi+还是相当好用的。创建缩略图步骤如下：1
- 下面笔者说说自己对进制转换的分析:笔者认为,任何进制都可以直接转换到十进制,而十进制也可以相当容易的转换到其他进制,所以笔者在这里将十进制作
- 之前有简单介绍过java多线程的使用，已经Thread类和Runnable类，为了更好地理解多线程，本文就Thread进行详细的分析。sta
- 1 前言Java是近 10 年来计算机软件发展过程中的传奇，其在众多开发者心中的地位可谓“爱不释手”
- 一 概述CMDD:\Project\Computer-Science-And-Technology\writeExam\farben\src
- 一、项目运行环境配置：Jdk1.8 + Tomcat8.5 + Mysql + HBuilderX（Webstorm也行）+ Eclispe
- 1、输出矩形以此矩形案例（4行，9列的矩形）为例public static void main(String[] args) {
- 上篇教程回顾ServerSocket --监听客户端的连接，他的作用主要是建立一个连接-ServerSocket -建立连接，拿到一个Soc
- 重载1.构造器的重载因为构造器的名字必须与类名相同，所以同一个类的所有构造器名肯定相同，构成重载；为了让系统能区分不同的构造器，多个构造器的
- 简介GraalVM是高性能的JDK，支持Java/Python/JavaScript等语言。它可以让Java变成二进制文件来执行，让程序在任
- 这篇文章主要介绍了Spring AOP AspectJ使用及配置过程解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考
- 本文实例讲述了C#自定义类型强制转换的用法。分享给大家供大家参考。具体分析如下：先来举一个小例子类定义：public class MyCur
- 新建Rest服务接口：[ServiceContract]public interface IService1{ &nb
- 对于Android 的手势不光在软件中会经常用到，比如浏览器中的翻
- 代码如下：@Test public void shengdanshu(){ //叶子层
- 好久就想着好好搭建一个ssm框架，自己以后用也方便吧，但是最近的事真的是很多，很多事情都没有去干，有时候自己会怀疑一下人生自己该不该去做程序
- mapper.xml使用循环语句mapper.java,传的参数是mapList<实体类> getList(Map<Str
- 1.什么是继承？（1）用来提高代码的复用性（2）将相同的功能模块封装到方法中需要使用时调用方法达到代码复用的目的（3）通过继承将多个类中的相
