How Do I Programmatically Set a WPF Image Source from an Embedded Resource?

Programmatically Setting WPF Image Sources from Embedded Resources

This guide addresses the common challenge of dynamically setting a WPF Image's source from an embedded resource within your application's code. A frequent problem is the failure of the embedded resource to display correctly, even when the image data appears to be present.

The Solution: Pack URIs

The key to resolving this lies in utilizing Pack URIs. These URIs provide a standardized way to reference resources embedded within your application's assemblies.

Code Example

Here's the code snippet to achieve this:

<code class="language-csharp">BitmapImage logo = new BitmapImage();
logo.BeginInit();
logo.UriSource = new Uri("pack://application:,,,/AssemblyName;component/Resources/logo.png");
logo.EndInit();

image.Source = logo;</code>

Deconstructing the Pack URI

Let's break down the URI components:

• pack://application:,,,: This is the scheme identifier for Pack URIs. Note the three commas after application: – this is crucial.

• /AssemblyName;component/Resources/logo.png: This section specifies the resource location.

  • AssemblyName: Replace this with the actual name of your assembly (without the .dll extension).
  • component: This keyword indicates that the resource is part of the main assembly.
  • /Resources/logo.png: This is the path to your image file within your project's Resources folder. Adjust accordingly.

Handling Special Characters

Remember to properly escape any reserved characters (like "%" and "?") within the path component of your URI.

Important Project Setting

Ensure that the image file ("logo.png" in this example) has its "Build Action" property set to "Resource" in your project's properties.

By following these steps, you can successfully load images from embedded resources into your WPF application dynamically.

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