Setting WPF image source in code

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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:

  • Authority: application:///

  • Path: The name of a resource file that is compiled into a referenced assembly. The path must conform to the following format: AssemblyShortName[;Version][;PublicKey];component/Path

    • 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 “https://stackoverflow.com/” character must
be replaced with the “,” character,
and reserved characters such as “%”
and “?” must be escaped. See the OPC
for details.

And of course, make sure you set the build action on your image to Resource.

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