使用自定义TextWriter时,OutputStream不可用

Question

这是我的函数,它将pdf转换为png图像,它在这一行上抛出一个错误 - > stream.WriteTo(Response.OutputStream); 有什么不对？？

protected void CreatePngFromPdf() 
        {

            try
            {

                string PDFLocation = string.Format(@"\\XXXX\{0}\{1}\{2}.pdf", Yr, Loc.Substring(0, 4), Loc.Substring(4, 4));
                Utilities.WebPDF.PDF WebPDF = new DocuvaultMVC.Utilities.WebPDF.PDF();

                WebPDF.Credentials = new NetworkCredential(@"xyz", "xyz");
                byte[] png = WebPDF.StreamPdfPageAsPngResize(PDFLocation,PageNumber, 612, 792);

                MemoryStream ms = new MemoryStream(png);
                MemoryStream stream = new MemoryStream();
                int newWidth = 612;
                int newHeight = 792;
                System.Drawing.Image newImg = System.Drawing.Image.FromStream(ms);

                Bitmap temp = new Bitmap(newWidth, newHeight, newImg.PixelFormat);
                Graphics newImage = Graphics.FromImage(temp);
                newImage.DrawImage(newImg, 0, 0, newWidth, newHeight);
                newImg.Dispose();

                temp.Save(stream, ImageFormat.Png);
                stream.WriteTo(Response.OutputStream);
                temp.Dispose();
                stream.Dispose();
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message.ToString());
            }
        }

Answer 1

这与你的问题没有直接关系,但是在做其他事情时我得到了同样的例外,所以我想我会把这个答案放在后面给后人......

我仅在主页渲染时才获得此异常,而不是在进行相关控制器操作时.

在我意识到我已经使用Html.Action(运行动作并发出HTML内联)而不是Url.Action(生成URL)时,会发生很多令人头疼的事.