当使用自定义的TextWriter OutputStream的不可 [英] OutputStream is not available when a custom TextWriter is used

问题描述

这是我的功能，PDF转换为png图片，它的投掷上的错误
这条线 - > stream.WriteTo（Response.OutputStream）;有一些东西错了??

 保护无效CreatePngFromPdf（）
        {            尝试
            {                串PDFLocation =的String.Format（@\\\\ XXXX \\ {0} \\ {1} \\ {2}的.pdf，YR，Loc.Substring（0，4），Loc.Substring（4，4））;
                Utilities.WebPDF.PDF WebPDF =新DocuvaultMVC.Utilities.WebPDF.PDF（）;                WebPDF.Credentials =新的NetworkCredential（@某某，某某）;
                字节[] =为png WebPDF.StreamPdfPageAsPngResize（PDFLocation，的PageNumber，612，792）;                MemoryStream的毫秒=新的MemoryStream（PNG）;
                MemoryStream的流=新的MemoryStream（）;
                INT newWidth = 612;
                INT newHeight = 792;
                为System.Drawing.Image newImg = System.Drawing.Image.FromStream（毫秒）;                位图TEMP =新位图（newWidth，newHeight，newImg.PixelFormat）;
                图形newImage = Graphics.FromImage（临时）;
                newImage.DrawImage（newImg，0，0，newWidth，newHeight）;
                newImg.Dispose（）;                temp.Save（流ImageFormat.Png）;
                stream.WriteTo（Response.OutputStream）;
                temp.Dispose（）;
                stream.Dispose（）;
            }
            赶上（异常前）
            {
                的Response.Write（ex.Message.ToString（））;
            }
        }
 

解决方案

这是不是您的问题直接相关的，但是别的事情做的时候，我得到了同样的异常，所以我想我把这个问题的答案在这里为后人。 ..

我得到这个例外只是当网页被渲染，而不是去到相关的控制器动作时。

大部分头刮随之而来，直到我意识到，我已经使用 Html.Action （运行的动作并发出HTML内嵌），而不是 Url.Action （生成的URL）。

this is my function which converts pdf to png image, it's throwing an error on this line--> stream.WriteTo(Response.OutputStream); Is there some thing wrong??

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());
            }
        }

解决方案

This is not directly relevant to your problem, but I got the same exception when doing something else, so I thought I'd put that answer here for posterity...

I got this exception merely when the homepage was rendering, rather than when going to the relevant controller action.

Much head-scratching ensues, until I realise that I've used Html.Action (which runs the action and emits the HTML inline) rather than Url.Action (which generates the URL).

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