C# MVC 将视图另存为 png

Question

我对 png HTML 渲染器有问题，我正在尝试将视图的 png 发送到电子邮件，但在电子邮件中我收到 0B .png PS: Ticket.pdf 可以

 using (MemoryStream ms = new MemoryStream())
        {

            var pdf = PdfGenerator.GeneratePdf(RenderRazorViewToString("TicketTemplateBig", model), PdfSharp.PageSize.A4);
            pdf.Save(ms, false);

            /////////////////
            //Bitmap bitmap = new Bitmap(Convert.ToInt32(1024), Convert.ToInt32(1024), System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            using (MemoryStream ms2 = new MemoryStream())
            {
                //Image image = TheArtOfDev.HtmlRenderer.WinForms.HtmlRender.RenderToImage(RenderRazorViewToString("TicketTemplateBig", model));

                Bitmap bitmap = (Bitmap)Image.FromFile(@"C:\logo.png");
                bitmap.Save(ms2, ImageFormat.Png);


                /////////////////
                await ms.FlushAsync();
                await ms2.FlushAsync();
                mm.Attachments.Add(new Attachment(ms, string.Format("Ticket.pdf"), "application/pdf"));
                streams.Add(ms);
                mm.Attachments.Add(new Attachment(ms2, string.Format("logo.png"), "application/png"));
                streams.Add(ms2);
                await client.SendMailAsync(mm);
            }
        }

Answer 1

您正在尝试在有效写入 ms2 之前发送邮件。

您需要在将 ms2 流缓冲区添加到 mm 之前刷新它。（正如您对 ms 所做的那样，这就是 pdf 部分被正确处理的原因）

（另外，小错别字："application/png" 而不是 "application/Png"，可能不是问题）

Answer 2

问题：流在最后一个位置

结果：ms2.Position = 0；

           using (MemoryStream ms = new MemoryStream())
        {

            var pdf = PdfGenerator.GeneratePdf(RenderRazorViewToString("TicketTemplateBig", model), PdfSharp.PageSize.A4);
            pdf.Save(ms, false);

            using (MemoryStream ms2 = new MemoryStream())
            {
                Image image = TheArtOfDev.HtmlRenderer.WinForms.HtmlRender.RenderToImage(RenderRazorViewToString("TicketTemplateBig", model));
                image.Save(ms2, ImageFormat.Png);
                ms2.Position = 0;
                await ms.FlushAsync();
                await ms2.FlushAsync();
                mm.Attachments.Add(new Attachment(ms, string.Format("Ticket.pdf"), "application/pdf"));
                mm.Attachments.Add(new Attachment(ms2, string.Format("Ticket.png"), "application/png"));
                await client.SendMailAsync(mm);
            }
        }

谢谢大家

C# MVC 将视图另存为 png

C# MVC save View as png

c#

asp.net-mvc

memorystream

html-rendering