类型'MailAddress‘在未引用的程序集中定义

Question

错误:类型'MailAddress‘是在未引用的程序集中定义的。必须添加对程序集'System.Net.Mail、Version=1.0.0.0、Culture=neutral、PublicKeyToken=null‘的引用。

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var myMessage = new SendGrid.SendGridMessage();

        myMessage.AddTo(model.To);
        myMessage.From = new System.Net.Mail.MailAddress(model.From, model.Subject);
        myMessage.Subject = model.Subject;
        myMessage.Text = model.TextBody;
        myMessage.Html = model.HtmlBody;

Answer 1

From类的SendGridMessage属性是Sendgrid.Helpers.Mail命名空间中的EmailAddress类的一种类型。但是您在这里指定了另一种类型

myMessage.From = new System.Net.Mail.MailAddress(model.From, model.Subject);

我认为您对.net核心使用了不正确的nuget包。与V3核心兼容的的正确更新的nuget包可在下面的链接(v9.9.0)中获得。

https://www.nuget.org/packages/Sendgrid/

检查下面的示例代码以使用V3 api使用MailHelper类发送电子邮件。

            var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
            var client = new SendGridClient(apiKey);
            var from = new EmailAddress("test@example.com", "Example User");
            var subject = "Sending with SendGrid is Fun";
            var to = new EmailAddress("test@example.com", "Example User");
            var plainTextContent = "and easy to do anywhere, even with C#";
            var htmlContent = "<strong>and easy to do anywhere, even with C#</strong>";
            var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
            var response = await client.SendEmailAsync(msg);

有关更多示例，请查看下面的链接

CASES.md#send-a-single-email-to-a-single-recipient

你可以在这里找到一个类似的问题。

https://github.com/sendgrid/sendgrid-csharp/issues/507