如何将ConnectStream文件附加到电子邮件中

using System;
using System.Net.Mail;
using TencentCloud.Common;
using TencentCloud.Common.Profile;
using TencentCloud.Ses.V20201002;
using TencentCloud.Ses.V20201002.Models;

public class EmailAttachmentExample
{
    public static void Main(string[] args)
    {
        // 创建一个电子邮件对象
        MailMessage email = new MailMessage();
        
        // 设置发件人、收件人、主题等属性
        email.From = new MailAddress("sender@example.com");
        email.To.Add("recipient@example.com");
        email.Subject = "附件示例";
        
        // 创建一个附件对象
        Attachment attachment = new Attachment(connectStream, "connectStream.txt");
        
        // 将附件对象添加到电子邮件对象的附件列表中
        email.Attachments.Add(attachment);
        
        // 使用腾讯云的邮件服务发送电子邮件
        try
        {
            Credential cred = new Credential("secretId", "secretKey");
            ClientProfile clientProfile = new ClientProfile();
            HttpProfile httpProfile = new HttpProfile();
            httpProfile.Endpoint = "ses.tencentcloudapi.com";
            clientProfile.HttpProfile = httpProfile;
            SesClient client = new SesClient(cred, "ap-guangzhou", clientProfile);
            SendEmailRequest req = new SendEmailRequest();
            req.FromEmailAddress = "sender@example.com";
            req.ToEmailAddress = "recipient@example.com";
            req.Subject = "附件示例";
            req.TextBody = "这是一个附件示例邮件";
            SendEmailResponse resp = client.SendEmailSync(req);
            Console.WriteLine(resp.ToJsonString());
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
    }
}