WPF throws “Cannot locate resource” exception when loading the image

resourceswpf

I am having a WPF window, with a background image of one file in my local system. So the XAML file looks like this:

 <Window.Background>
    <ImageBrush ImageSource="/MYASSEMBLY;component/Resources/MyPic.png"/>
 </Window.Background>

In the XAML designer it actually shows this background image, so the image does exist in MYASSEMBLY\Resources folder. However, in the InitializeComponent() function call when I launch the application, it throws the exception

Cannot locate resource 'resources/mypic.png'.

So I am totally lost now. Are the directories different between the design and runtime so doesn't exist in the runtime?

Best Answer

In Solution Explorer set the image file's Build Action property to Resource. Then clean the solution and rebuild it.

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WPF UserControl cannot find XAML resource in referencing project

Found it.

Turns out there is a better way to specify the path, Pack URIs. I changed the XAML to the following:

<UserControl.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/RoutingManager;component/Resources/ViewResources.xaml" />
        </ResourceDictionary.MergedDictionaries>
        <!-- Local styles here -->
    </ResourceDictionary>
</UserControl.Resources>

and that fixed it.

C# – WPF control throwing ‘resource identified by the URI missing’ exception

The only way to do this would be to include the version information in your URI, so the XAML loader can distinguish the correct type. This MSDN article explains the Pack URI format, and the Version portion has this description:

;Version [optional]: the version of the referenced assembly that contains the resource file. This is used when two or more referenced assemblies with the same short name are loaded.

So you'd want to use one of the following:

/ThePluginAssembly;v1.0.0.0;component/XYZ.xaml
/ThePluginAssembly;v1.1.0.0;component/XYZ.xaml

Best Answer

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WPF UserControl cannot find XAML resource in referencing project

C# – WPF control throwing ‘resource identified by the URI missing’ exception

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