What is the correct way to print images using WPF DocumentPaginator

Question

Here is my code that is in a class extending DocumentPaginator

    public override DocumentPage GetPage(int pageNumber)
    {
        BitmapImage source = new BitmapImage();
        using (Stream stream = new FileStream(GetPagePath(pageNumber), FileMode.Open))
        {
            source.BeginInit();
            source.StreamSource = stream;
            source.CacheOption = BitmapCacheOption.OnLoad;
            source.EndInit();
        }

        var image = new Image { Source = source };

        Rect contentBox = new Rect(PageSize);

        return new DocumentPage(image, PageSize, contentBox, contentBox);
    }

However when I actually run this code, it doesn't seem to load my image and merely prints blank pages.

What is the correct way to load my image and attach it to a DocumentPage object?

Possible duplicate of [Adding Image to FixedPage in WPF](http://stackoverflow.com/questions/11853096/adding-image-to-fixedpage-in-wpf) — Joshua Shearer, Oct 07 '15 at 18:12
I had seen that post... a `FixedPage` is not the same thing as a `DocumentPage`. — theycallmemorty, Oct 07 '15 at 18:24
Have you tried the code from that answer for creating the `BitmapImage` instance? — Joshua Shearer, Oct 07 '15 at 18:33
instead of assigning `StreamSource`, have you tried setting `UriSource` to the path of the image, like `source.UriSource = new Uri(GetPagePath(pageNumber));` ? This is how we're doing it in our in-house applications. — Joshua Shearer, Oct 07 '15 at 20:48
@JoshuaShearer If you want to be sure that the BitmapImage is loaded immediately, you have to set the StreamSource property and also set the BitmapCacheOption.OnLoad flag, as OP does. There's nothing wrong with that part of the code. — Clemens, Oct 07 '15 at 20:58
@Clemens Thanks for the info. One less place to look for issues, I suppose. — Joshua Shearer, Oct 07 '15 at 21:06

Clemens · Answer 1 · 2015-10-07T21:18:52.413

0

You must do the layout of the Image control by calling its Measure() and Arrange() methods:

var image = new Image { Source = source };
var size = new Size(source.PixelWidth, source.PixelHeight);
image.Measure(size);
image.Arrange(new Rect(size));

edited Oct 07 '15 at 21:18

answered Oct 07 '15 at 21:13

Clemens

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What is the correct way to print images using WPF DocumentPaginator

1 Answers1