C# WPF自动发送Thunderbird邮件带附件图片

以下是一个基本的 C# WPF 代码示例，用于自动发送 Thunderbird 邮件带附件图片：

using System;
using System.Net.Mail;
using System.Net.Mime;
using System.Windows;
using System.IO;

namespace ThunderbirdMailSender
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnSend_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                // 创建邮件对象
                MailMessage message = new MailMessage();

                // 设置发件人地址
                message.From = new MailAddress(txtFrom.Text);

                // 设置收件人地址
                message.To.Add(new MailAddress(txtTo.Text));

                // 设置主题和正文
                message.Subject = txtSubject.Text;
                message.Body = txtBody.Text;

                // 添加附件
                if (txtAttachment.Text != "")
                {
                    Attachment attachment = new Attachment(txtAttachment.Text, MediaTypeNames.Image.Jpeg);
                    message.Attachments.Add(attachment);
                }

                // 创建 SMTP 客户端对象
                SmtpClient client = new SmtpClient("smtp.live.com", 587);

                // 设置 SMTP 客户端的凭据
                client.Credentials = new System.Net.NetworkCredential(txtUsername.Text, txtPassword.Password);

                // 启用 SSL
                client.EnableSsl = true;

                // 发送邮件
                client.Send(message);

                MessageBox.Show("邮件发送成功！", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show("邮件发送失败！" + ex.Message, "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void btnAttachment_Click(object sender, RoutedEventArgs e)
        {
            // 打开文件对话框，选择附件
            Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
            dlg.DefaultExt = ".jpg";
            dlg.Filter = "JPEG 图片 (*.jpg)|*.jpg";
            Nullable<bool> result = dlg.ShowDialog();

            // 如果选择了文件，将其路径显示在文本框中
            if (result == true)
            {
                txtAttachment.Text = dlg.FileName;
            }
        }
    }
}

在 XAML 中，创建了一个包含文本框、按钮和标签的基本窗口界面，以及一个单击发送按钮时触发的事件处理程序。用户可以输入发件人、收件人、主题、正文和附件路径，然后单击发送按钮发送邮件。

<Window x:Class="ThunderbirdMailSender.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Thunderbird Mail Sender" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Label Grid.Row="0" Grid.Column="0" Content="From:"/>
        <TextBox Grid.Row="0" Grid.Column="1" x:Name="txtFrom" Margin="5"/>
        <Label Grid.Row="1" Grid.Column="0" Content="To:"/>
        <TextBox Grid.Row="1" Grid.Column="1" x:Name="txtTo" Margin="5"/>
        <Label Grid.Row="2" Grid.Column="0" Content="Subject:"/>
        <TextBox Grid.Row="2" Grid.Column="1" x:Name="txtSubject" Margin="5"/>
        <Label Grid.Row="3" Grid.Column="0" Content="Body:"/>
        <TextBox Grid.Row="3" Grid.Column="1" x:Name="txtBody" Margin="5" Height="100"/>
        <Label Grid.Row="4" Grid.Column="0" Content="Attachment:"/>
        <TextBox Grid.Row="4" Grid.Column="1" x:Name="txtAttachment" Margin="5"/>
        <Button Grid.Row="4" Grid.Column="2" x:Name="btnAttachment" Content="Browse" Click="btnAttachment_Click"/>
        <Label Grid.Row="5" Grid.Column="0" Content="Username:"/>
        <TextBox Grid.Row="5" Grid.Column="1" x:Name="txtUsername" Margin="5"/>
        <Label Grid.Row="6" Grid.Column="0" Content="Password:"/>
        <PasswordBox Grid.Row="6" Grid.Column="1" x:Name="txtPassword" Margin="5"/>
        <Button Grid.Row="7" Grid.Column="1" x:Name="btnSend" Content="Send" Margin="5" Click="btnSend_Click"/>
    </Grid>
</Window>
``