C#实现SMTP邮件附件发送功能详解
更新时间：2022年12月28日 08:36:33 作者：芝麻粒儿
这篇文章主要为大家详细介绍了如何利用C#实现SMTP邮件附件发送的功能，文中的示例代码讲解详细，对我们学习C#有一定的帮助，感兴趣的小伙伴可以跟随小编一起了解一下
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;
}
到此这篇关于C#实现SMTP邮件附件发送功能详解的文章就介绍到这了,更多相关C# SMTP邮件附件发送内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！
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