wpf documentviewer throws exception on mouse over image

Question

I have a fixeddocument in which i have an image. The source-property of the image is bound to a byte-array (read from the database) in the datacontext of the document. When I am moving the mouse over the image I get a filenotfoundexception.

It looks like the documentviewer tries to load additional information about the rendered image from a file named "image" in the working directory which of course does not exist.

Does somebody know how to disable this behavior?

We need more info about your issue, most importantly how you assign the image to the control. I generally use a converter and transform byte array to a bitmap and return that for an image control. — XAMlMAX, Sep 15 '17 at 12:53
currently the source-property of the image is bound directly to the byte-array: public byte[] PassPhoto { get { return this.person.PassPhoto; } } i will try your solution... — Hurby, Sep 15 '17 at 13:04
Try using a converter and transform that byte array to a bitmap. [more info here](https://stackoverflow.com/a/21555447/2029607) — XAMlMAX, Sep 15 '17 at 13:05
converting the byte-array into a bitmap did not work (image was not shown) but converting to a ImageSource did it. thank you for pointing me in the right direction — Hurby, Sep 15 '17 at 14:01
Did you set the cache option to `OnLoad` for the bitmap? Like [this post shows](https://stackoverflow.com/a/14337202/2029607). — XAMlMAX, Sep 15 '17 at 14:03
@XAMlMAX Why write an answer when you already link to a duplicate question in a comment? — Clemens, Sep 28 '17 at 12:47
@Hurby Which version of WPF are you using? There should be built-in automatic type conversion from `byte[]` to `ImageSource`. — Clemens, Sep 28 '17 at 12:49

score 0 · Answer 1 · edited Sep 28 '17 at 12:54

You can create a BitmapImage from a byte array with the following converter:

public class BytesToBitmapConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var bytes = (byte[])value; // make sure it is an array beforehand

        using (var ms = new System.IO.MemoryStream(bytes))
        {
            var image = new BitmapImage();
            image.BeginInit();
            image.CacheOption = BitmapCacheOption.OnLoad;
            image.StreamSource = ms;
            image.EndInit();
            return image;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }
}

Then in your xaml you would use this like so:

<Image Source="{Binding propertyNameHere, Converter={StaticResource converterName}}"/>

wpf documentviewer throws exception on mouse over image

1 Answers1