sendgrid多个收件人c＃

Question

我正在使用此代码从Web应用程序发送电子邮件。仅一个收件人就没问题。我已经研究过使用来自https://sendgrid.com/docs/Integrate/Code_Examples/v3_Mail/csharp.html的相同技术将电子邮件发送给多个收件人。我尝试用逗号分隔的字符串作为destinatario（请参见代码中的args），即you @ example.com，she @ example.com，he @ example.com，但SendGrid仅接受第一个收件人。我也尝试过使用数组，但结果是类似的，SG只接受最后一个收件人。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("someone@example.com");
        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());
    }


}

Answer 1

您需要为此添加个性化列表。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("sender@email.com", "Sender Name"),
    Subject = "Subject",
    PlainTextContent = "Text for body",
    HtmlContent = "<strong>Hello World!",
    Personalizations = new List<Personalization>
    {
         new Personalization
         {
              Tos = new List<EmailAddress> 
              {
                   new EmailAddress("abc@email.com", "abc"),
                   new EmailAddress("efg@email.com", "efg")
              }
         }
     }
};

var response = await client.SendEmailAsync(msg);

欲了解更多详情，请查看以下邮件发送

Answer 2

您的问题的答案可以在库的源代码中找到，有两个构造函数来创建 Mail 对象。正如您所说，您使用的构造函数仅适合向一位收件人发送邮件。您必须使用无参数构造函数。

var mail = new Mail();
mail.Subject = "subject";
mail.From = new Email("from@example.com", "fromName");
mail.AddContent(new Content("text/html", "<p>this is a mail<p>"));
mail.AddPersonalization(personalization);

实际的收件人是通过Personalization对象添加的：

var personalization = new Personalization();
foreach (Email email in emailList)
{
    personalization.AddTo(email);
}

此个性化对象还允许更多自定义，例如将收件人添加为抄送或密件抄送。