WPF Custom Control with Image problem

Question

Hi all,

I am quite new to WPF/XAML and I am currently facing a problem.

I have a solution with two projects in it, the first project is a Custom Control Library with a custom Window form control inside. The second project is a WPF application using my custom window form.

All work fine except for the form Icon. In the WPF application project I set my window icon property to "/ProjectTwoNameSpace;component/Resources/Images/Film.ico", and in the WPF custom control I try to show that image that way :

<Image Grid.Column="0" Margin="3" Width="27" Height="27">
     <Image.Source>
        <BitmapImage UriSource="{Binding Path=Icon}" />
     </Image.Source>
 </Image>

But it doesn't work, I get a error at runtime saying that the property UriSource or StreamSource must be set for my tag.

Anyone can help me ? I think it's jsut a WPF newbie problem ^^

Answer 1

The UriSource property of a BitmapImage cannot be set as you have shown because it is of type Uri and you are trying to set it to a string. I'd say the easiest way to accomplish what you're doing is to bind your Image.Source to Icon, and then convert the string to a bitmap Image object. Assuming your control is in a window, this would look something like this

<Window.Resources>
    <converters:StringToBitmapImageConverter x:Key="stringToBitmapImageConverter" />
</Window.Resources>

...

<Image Grid.Column="0" Margin="3" Width="27" Height="27"
    Source="{Binding Path=Icon, Converter={StaticResource stringToBitmapImageConverter}}">
</Image>

And then the converter would look like:

class StringToBitmapImageConverter: IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        BitmapImage image = new BitmapImage();
        image.BeginInit();
        image.UriSource = new Uri(value as string);
        image.EndInit();

        return image;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
}