如何在win服务中使用Gmail API

using Google.Apis.Auth.OAuth2;
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;
using Google.Apis.Services;
using System.IO;

// 在服务的入口方法中调用此方法
private void SendEmail()
{
    string serviceAccountEmail = "your-service-account-email@your-project-id.iam.gserviceaccount.com";
    string privateKeyPath = "path-to-your-private-key-file.p12";
    string privateKeyPassword = "your-private-key-password";
    string userEmail = "your-email@gmail.com";

    // 使用服务账号的JSON密钥文件进行身份验证
    var credential = new ServiceAccountCredential(
        new ServiceAccountCredential.Initializer(serviceAccountEmail)
        {
            Scopes = new[] { GmailService.Scope.GmailSend },
            User = userEmail
        }.FromPrivateKey(File.ReadAllBytes(privateKeyPath), privateKeyPassword));

    // 创建Gmail API服务
    var service = new GmailService(new BaseClientService.Initializer()
    {
        HttpClientInitializer = credential,
        ApplicationName = "Your Application Name"
    });

    // 构建电子邮件消息
    var email = new MimeMessage();
    email.From.Add(new MailboxAddress("Sender Name", "sender@gmail.com"));
    email.To.Add(new MailboxAddress("Recipient Name", "recipient@gmail.com"));
    email.Subject = "Test Email";
    email.Body = new TextPart("plain")
    {
        Text = "This is a test email."
    };

    // 将电子邮件消息转换为原始格式
    using (var stream = new MemoryStream())
    {
        email.WriteTo(stream);
        var rawMessage = Convert.ToBase64String(stream.ToArray());

        // 发送电子邮件
        var message = new Message { Raw = rawMessage };
        service.Users.Messages.Send(message, "me").Execute();
    }
}