Posted By: Torbjørn
I’m trying to set a WPF image’s source in code. The image is embedded as a resource in the project. By looking at examples I’ve come up with the below code. For some reason it doesn’t work – the image does not show up.
By debugging I can see that the stream contains the image data. So what’s wrong?
Assembly asm = Assembly.GetExecutingAssembly(); Stream iconStream = asm.GetManifestResourceStream("SomeImage.png"); PngBitmapDecoder iconDecoder = new PngBitmapDecoder(iconStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default); ImageSource iconSource = iconDecoder.Frames; _icon.Source = iconSource;
The icon is defined something like this:
<Image x:Name="_icon" Width="16" Height="16" />
After having the same problem as you and doing some reading, I discovered the solution – Pack URIs.
I did the following in code:
Image finalImage = new Image(); finalImage.Width = 80; ... BitmapImage logo = new BitmapImage(); logo.BeginInit(); logo.UriSource = new Uri("pack://application:,,,/AssemblyName;component/Resources/logo.png"); logo.EndInit(); ... finalImage.Source = logo;
Or shorter, by using another BitmapImage constructor:
finalImage.Source = new BitmapImage( new Uri("pack://application:,,,/AssemblyName;component/Resources/logo.png"));
The URI is broken out into parts:
Path: The name of a resource file that is compiled into a referenced assembly. The path must conform to the following format:
- AssemblyShortName: the short name for the referenced assembly.
- ;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.
- ;PublicKey [optional]: the public key that was used to sign the referenced assembly. This is used when two or more referenced assemblies with the same short name are loaded.
- ;component: specifies that the assembly being referred to is referenced from the local assembly.
- /Path: the name of the resource file, including its path, relative to the root of the referenced assembly’s project folder.
The three slashes after
application: have to be replaced with commas:
Note: The authority component of a pack URI
is an embedded URI that points to a
package and must conform to RFC 2396.
Additionally, the “/” character must
be replaced with the “,” character,
and reserved characters such as “%”
and “?” must be escaped. See the OPC
And of course, make sure you set the build action on your image to