问题描述

我有一个发送邮件的接口

public interface IMailSender
{
    void SendMail(MailMessage message);
}

创建邮件时，我使用AlternateView(纯文本和html)

现在我想创建一个SendGridMailSender类来实现该接口，但我的问题是我不知道如何根据MailMessage填充SendGrid.Html和SendGrid.Text。我能找到的唯一解决方案是使用StreamReader并按索引访问AlternateViewsCollection，我想还有一个更好的解决方案我想不出来。

public void SendMail(MailMessage message)
{
        var sendGridMessage = CreateSendGridMessage(message);

        // Create network credentials to access your SendGrid account.
        var user = "userCredential";
        var pswd = "userPaswd";

        var credentials = new NetworkCredential(user, pswd);

        // Create an SMTP transport for sending email.
        var transportSMTP = SMTP.GetInstance(credentials);

        // Send the email.
        transportSMTP.Deliver(sendGridMessage);
}

private SendGrid CreateSendGridMessage(MailMessage mail)
{
    var sendGridMessage = SendGrid.GetInstance();

    sendGridMessage.From = mail.From;

    var recipients = mail.To;

    foreach (var recipient in recipients)
    {
        sendGridMessage.AddTo(recipient.ToString());
    }

    var stream = mail.AlternateViews[0].ContentStream;
    using (var reader = new StreamReader(stream))
    {
        sendGridMessage.Text = reader.ReadToEnd();
    }

    stream = mail.AlternateViews[1].ContentStream;
    using (var reader = new StreamReader(stream))
    {
        sendGridMessage.Html = reader.ReadToEnd();
    }

    return sendGridMessage;
}

谢谢

推荐答案

访问AlternateView内容的唯一方法是通过流，因此您的解决方案是正确的，尽管您还应该检查ContentType以确保mail.AlternateViews[0]实际上是您的文本部分，依此类推。

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