sendgrid多个收件人c#

我正在使用此代码从网络应用程序发送电子邮件。只有一位收件人没有问题。我研究过使用来自的相同技术https://sendgrid.com/docs/Integrate/Code_Examples/v3_Mail/csharp.html向多个收件人发送电子邮件。我尝试使用逗号分隔的字符串作为目标（请参阅代码中的参数），即[电子邮件受保护], [电子邮件受保护], [电子邮件受保护]但 SendGrid 仅接受第一个收件人。我也尝试使用数组，但结果相似，SG 仅获取最后一个收件人。传递收件人列表的正确方法是什么？

public class email
{
    public void enviar(string destinatario, string asunto, string contenido)
    {
        Execute(destinatario, asunto, contenido).Wait();
    }

    static async Task Execute(string destinatario, string asunto, string contenido)
    {
        string apiKey = "SG...............";
        dynamic sg = new SendGridAPIClient(apiKey);

        Email from = new Email("[email protected]");
        string subject = asunto;
        Email to = new Email(destinatario);
        Content content = new Content("text/plain", contenido);           

        Mail mail = new Mail(from, subject, to, content);
        dynamic response = await sg.client.mail.send.post(requestBody: mail.Get());
    }


}

您需要添加个性化列出这个。以下代码对我有用。

var apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY");
var client = new SendGridClient(apiKey);
var msg = new SendGridMessage()
{
    From = new EmailAddress("[email protected]", "Sender Name"),
    Subject = "Subject",
    PlainTextContent = "Text for body",
    HtmlContent = "<strong>Hello World!",
    Personalizations = new List<Personalization>
    {
         new Personalization
         {
              Tos = new List<EmailAddress> 
              {
                   new EmailAddress("[email protected]", "abc"),
                   new EmailAddress("[email protected]", "efg")
              }
         }
     }
};

var response = await client.SendEmailAsync(msg);

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