public void Test_EmbedImage_linkedresourcecollection()
        {
            var filename   = Path.GetTempFileName();
            var attachment = new Attachment(filename);
            var av         = AlternateView.CreateAlternateViewFromString("Testing");

            av.LinkedResources.Add(new LinkedResource(filename));

            var mail = BasicMailBuilder
                       .EmbedImages(av.LinkedResources)
                       .Build();

            var message = new SendGridMessage();

            message.AddAttachment(attachment.ContentStream, attachment.Name);
            message.EmbedImage(av.LinkedResources[0].ContentId, av.LinkedResources[0].ContentId);
            CollectionAssert.AreEquivalent(message.GetEmbeddedImages().ToList(), mail.GetEmbeddedImages().ToList());
            Assert.AreEqual(1, message.StreamedAttachments.Count);
            Assert.AreEqual(1, mail.StreamedAttachments.Count);
            Assert.AreEqual(message.StreamedAttachments.First().Value.Length, mail.StreamedAttachments.First().Value.Length);
        }
        public void Test_EmbedImage_listlinkedresource()
        {
            var filename        = new string[] { Path.GetTempFileName(), Path.GetTempFileName() };
            var attachments     = filename.ToList().ConvertAll <Attachment>((x) => { return(new Attachment(x)); });
            var linkedResources = filename.ToList().ConvertAll <LinkedResource>((x) => { return(new LinkedResource(x)); });

            var mail = BasicMailBuilder
                       .EmbedImages(linkedResources)
                       .Build();

            var message = new SendGridMessage();

            message.AddAttachment(attachments[0].ContentStream, attachments[0].Name);
            message.AddAttachment(attachments[1].ContentStream, attachments[1].Name);
            message.EmbedImage(linkedResources[0].ContentId, linkedResources[0].ContentId);
            message.EmbedImage(linkedResources[1].ContentId, linkedResources[1].ContentId);
            CollectionAssert.AreEquivalent(message.GetEmbeddedImages().ToList(), mail.GetEmbeddedImages().ToList());
            Assert.AreEqual(2, message.StreamedAttachments.Count);
            Assert.AreEqual(2, mail.StreamedAttachments.Count);
            Assert.AreEqual(message.StreamedAttachments.First().Value.Length, mail.StreamedAttachments.First().Value.Length);
            Assert.AreEqual(message.StreamedAttachments.Last().Value.Length, mail.StreamedAttachments.Last().Value.Length);
        }