什么是XPS文件，以及它是如何被使用它是、文件、XPS

2023-09-04 02:39:29 作者：青歌

我有一个简单的C＃.NET Web应用程序。在此我正在使用XPS文件。我使用了下列code

I have a simple C# .net web application. In that I'm working with XPS files. I have used the following code

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                string xpsFile = "D:\\Completed-Form.xps";
                xpsToBmp(xpsFile);
                MessageBox.Show("Done");
            }
            catch (Exception ex)
            {
                MessageBox.Show (ex.Message);
            }
        }

        static public void xpsToBmp(string xpsFile)
        {
            XpsDocument xps = new XpsDocument(xpsFile, System.IO.FileAccess.Read);
            FixedDocumentSequence sequence = xps.GetFixedDocumentSequence();

            for (int pageCount = 0; pageCount < sequence.DocumentPaginator.PageCount; ++pageCount)
            {
                DocumentPage page = sequence.DocumentPaginator.GetPage(pageCount);
                RenderTargetBitmap toBitmap = new RenderTargetBitmap((int)page.Size.Width,(int)page.Size.Height,96,96,System.Windows.Media.PixelFormats.Default);

                toBitmap.Render(page.Visual);

                BitmapEncoder bmpEncoder = new BmpBitmapEncoder();
                bmpEncoder.Frames.Add(BitmapFrame.Create(toBitmap));

                FileStream fStream = new FileStream("D:\\xpstobmp" + pageCount + ".bmp", FileMode.Create, FileAccess.Write);
                bmpEncoder.Save(fStream);
                fStream.Close();
            }
        }

当我调试code，发生显示为 XamlParserException 错误

When I debug the code, an error showing as XamlParserException occurred

System.Windows.Documents.DocumentReference在类型构造函数的调用'符合指定绑定约束引发了异常。行号'2'和线位20。

'The invocation of the constructor on type 'System.Windows.Documents.DocumentReference' that matches the specified binding constraints threw an exception.' Line number '2' and line position '20'.

在code以下行：

FixedDocumentSequence sequence = xps.GetFixedDocumentSequence();

//：

我从 HTTP下载的样本XPS文件msdn.microsoft.com/en-us/library/windows/hardware/gg463422.aspx （我有160MB的zip文件从那里。当我将它解压缩有一些具有.xps扩展名的文件夹和文件。我不知道如何使用这些文件），并在上面code使用。我很新的这个文件的概念。我不知道如何解决这个错误，以及如何.xps文件被使用。我也有关于位图文件知之甚少。

I have downloaded a sample XPS file from http://msdn.microsoft.com/en-us/library/windows/hardware/gg463422.aspx (I got 160MB zip file from there. When I unzip it there were a number of folders and files having .xps extension. I don't know how to use these files) and used in the above code. I'm very new to this file concept. I don't know how to resolve this error and how the .xps files are used. Also I have little knowledge about bitmap files.

什么是XPS文件，以及它是如何被使用它是、文件、XPS

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