这个小程序是之前做的，今天把它晾上来了。程序比较简单，，适合初学者学习。先给个截图：
实现单发和多发功能，可附加多份附件，限制总大小为1M，大于后无法发送。
默认发送格式为Html。
【修改】【添加】的操作是针对发件人的，点击【修改】弹出下图界面：
填充文本框的是在ThreadSendEmail.cs中的构造函数中
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="strSenderEmail">发件人邮箱</param>
/// <param name="strTitle">邮件标题</param>
/// <param name="strBody">邮件正文</param>
/// <param name="ToEmail">收件人邮箱</param>
/// <param name="AttachmentFiles">附件</param>
public ThreadSendEmail(string strSenderEmail, string strTitle, string strBody, string ToEmail, ArrayList AttachmentFiles)
{
this.strSenderEmail = strSenderEmail;
strToEmail = ToEmail;
strEmailTitle = strTitle;
strEmailBody = strBody;
arrAttachmentFiles = AttachmentFiles;
using (FileStream stream = new FileStream(inforpath, FileMode.OpenOrCreate, FileAccess.Read))
{
using (StreamReader read = new StreamReader(stream, Encoding.Default))
{
string GetSenderInfor;
while ((GetSenderInfor = read.ReadLine()) != null)
{
string[] line = GetSenderInfor.Trim().Split(' ');
if (line[1] == strSenderEmail)
{
strSenderSMTP = line[0];
strSnederPwd = line[2];
}
}
}
}
}
当然，点击【添加】文本框中是没有内容的。
下面的函数是发送邮件函数
/// <summary>
/// 发送邮件
/// </summary>
/// <returns>true:发送成功 false:发送失败</returns>
public bool Send()
{
SmtpClient client = new SmtpClient();
client.Host = strSenderSMTP;
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential(strSenderEmail, strSnederPwd);
client.DeliveryMethod = SmtpDeliveryMethod.Network;
MailMessage mm = new MailMessage(strSenderEmail, strToEmail, strEmailTitle, strEmailBody);
mm.BodyEncoding = Encoding.Default;
mm.IsBodyHtml = true;
if (arrAttachmentFiles.Count != 0)
{
foreach (string attach in arrAttachmentFiles)
{
Attachment attachment = new Attachment(attach, System.Net.Mime.MediaTypeNames.Application.Octet);
mm.Attachments.Add(attachment);
}
}
try
{
client.Send(mm);
MessageBox.Show("邮件发送成功", "成功", MessageBoxButtons.OK);
return true;
}
catch (Exception ex)
{
MessageBox.Show("发送失败" + ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return false;
}
}
若为修改时，点击添加、修改发件人对话框确定按钮，程序将清空txt然后重新写入。具体代码为
确定按钮代码
1 private void btnOK_Click(object sender, EventArgs e)
2 {
3 NewInforLine = txtSMTP.Text + " " + txtSenderEmail.Text + " " + txtSenderPwd.Text;
4 Regex regex = new Regex(@"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"); //验证Email格式
5 if (regex.IsMatch(txtSenderEmail.Text.Trim()) && txtSenderPwd.Text.Trim() != "")
6 {
7 if (arg) //修改发件人
8 {
9 string[] content;
10 string[] content1;
11 try
12 {
13 content = File.ReadAllLines(PathBase + inforpath, Encoding.Default);
14 content1 = new string[content.Length];
15 for (int i = 0; i < content.Length; i++)
16 {
17 if (content[i] != OldInforLine)
18 {
19 content1[i] = content[i];
20 continue;
21 }
22 content1[i] = NewInforLine;
23 }
24
25 FileStream stream2 = File.Open(inforpath, FileMode.OpenOrCreate, FileAccess.Write);
26 stream2.Seek(0, SeekOrigin.Begin);
27 stream2.SetLength(0); //清空txt文件
28 stream2.Close();
29 File.WriteAllLines(PathBase + inforpath, content1);
30 }
31 catch (Exception ex)
32 {
33 MessageBox.Show(ex.Message);
34 }
35 }
36 else //添加发件人
37 {
38 using (FileStream stream = new FileStream(inforpath, FileMode.Append, FileAccess.Write))
39 {
40 using (StreamWriter write = new StreamWriter(stream, Encoding.Default))
41 {
42 string stremail = txtSMTP.Text + " " + txtSenderEmail.Text + " " + txtSenderPwd.Text;
43 write.WriteLine(stremail);
44 }
45 }
46 }
47 ClearContent();
48 this.DialogResult = System.Windows.Forms.DialogResult.OK;
49 }
50 else
51 {
52 MessageBox.Show("邮箱格式不正确", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
53 this.DialogResult = System.Windows.Forms.DialogResult.None;
54 }
55 }
程序结构：
添加收件人按钮弹出
适合初学者，程序里面有注解，比较容易懂。