将 RichTextBox FlowDocument 保存为图像 [英] Saving RichTextBox FlowDocument to image

问题描述

我正在制作一个我想要 RichTextBox 的程序要保存为图像 (jpg/png) 的内容(文本+图像).我尝试使用这个解决方案但我只从

i'am making a programm where i want my RichTextBox content (text+images) to be saved as an image (jpg/png). I tried to use this solution but i get only black filled image from

SaveUIAsGraphicFile() 

我还尝试从我的 rtb 控件创建 FormattedText，打印它工作正常，但无法在其中插入图像.也许可以以某种方式打印 FlowDocument?

I also tried to create FormattedText from my rtb control, printing it works fine, but its not possible to insert images in there. Maybe it is possible to print FlowDocument somehow?

推荐答案

您可以使用类似以下方法从 FlowDocument 创建位图:

You could use something like the following method to create a bitmap from a FlowDocument:

public BitmapSource FlowDocumentToBitmap(FlowDocument document, Size size)
{
    document = CloneDocument(document);

    var paginator = ((IDocumentPaginatorSource)document).DocumentPaginator;
    paginator.PageSize = size;

    var visual = new DrawingVisual();
    using (var drawingContext = visual.RenderOpen())
    {
        // draw white background
        drawingContext.DrawRectangle(Brushes.White, null, new Rect(size));
    }
    visual.Children.Add(paginator.GetPage(0).Visual);

    var bitmap = new RenderTargetBitmap((int)size.Width, (int)size.Height,
                                        96, 96, PixelFormats.Pbgra32);
    bitmap.Render(visual);
    return bitmap;
}

public FlowDocument CloneDocument(FlowDocument document)
{
    var copy = new FlowDocument();
    var sourceRange = new TextRange(document.ContentStart, document.ContentEnd);
    var targetRange = new TextRange(copy.ContentStart, copy.ContentEnd);

    using (var stream = new MemoryStream())
    {
        sourceRange.Save(stream, DataFormats.XamlPackage);
        targetRange.Load(stream, DataFormats.XamlPackage);
    }

    return copy;
}

然后使用如下所示将 RichTextBox 的文档保存到图像文件中.

and then use it like shown below to save a RichTextBox's Document to an image file.

var doc = richTextBox.Document;
var bm = FlowDocumentToBitmap(doc, new Size(richTextBox.ActualWidth, richTextBox.ActualHeight));
var encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bm));

using (var stream = new FileStream("doc.jpg", FileMode.Create))
{
    encoder.Save(stream);
}   

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