无法打开附件 - Xamarin.Forms 应用程序

Question

我正在 Xamarin.Forms app.I 使用 Syncfusion 的帮助生成带有简单示例的 PDF 以生成 PDF 并在流中转换。生成、发送的 PDF 大约为 27KB。但是当我去我的邮件并打开它时，我得到 We can't open this file by Adobe Reader:

//Create a new PDF document.
PdfDocument doc = new PdfDocument();
//Add a page.
PdfPage page = doc.Pages.Add();
//Create a PdfGrid.
PdfGrid pdfGrid = new PdfGrid();
//Add values to list
List<object> data1 = new List<object>();
Object row1 = new { ID = "E01", Name = "Clay" };
Object row2 = new { ID = "E02", Name = "Thomas" };
Object row3 = new { ID = "E03", Name = "Andrew" };
Object row4 = new { ID = "E04", Name = "Paul" };
Object row5 = new { ID = "E05", Name = "Gray" };
data1.Add(row1);
data1.Add(row2);
data1.Add(row3);
data1.Add(row4);
data1.Add(row5);
//Add list to IEnumerable
IEnumerable<object> dataTable = data;
//Assign data source.
pdfGrid.DataSource = dataTable;
//Draw grid to the page of PDF document.
pdfGrid.Draw(page, new PointF(10, 10));
//Save the PDF document to stream.
MemoryStream stream = new MemoryStream();
doc.Save(stream);
//Close the document.
doc.Close(true);

var message = new MailMessage();
message.From = new MailAddress("admin.server.com");
message.To.Add("test@hotmail.com");
message.Subject = "Subject";
message.Body = "Body";
message.Attachments.Add(new Attachment(stream, "Test.pdf", "application/pdf"));

SmtpClient SmtpServer = new SmtpClient("mail.server.com");
SmtpServer.Host = "mail.server.com";
SmtpServer.Port = 587;
SmtpServer.EnableSsl = false;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("admin.server.com", "1234567");

如何找到打开的问题？

Answer 1

MemoryStream class 可用于写入和读取，但它只有一个 Position 属性用于这两个任务。因此，如果使用单个实例同时进行流写入和读取，则通常必须在执行写入代码后将 Position 属性重置为开始，以允许读取代码检索所有内容流。

在您的情况下，这意味着您应该在 doc.Save(stream) 之后将 stream.Position 设置为 0。

无法打开附件 - Xamarin.Forms 应用程序

Can't open attached file - Xamarin.Forms App

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