How Do I Correctly Set Image Sources Using Pack URIs in WPF Code?

Set image source in WPF code: Understanding Pack URIs

In WPF, setting the image source codefully is a common task. However, developers often run into problems when dealing with embedded resource images, as shown in the code below.

The key to the problem is that it is assumed that the image stream contains image data. While this is correct, WPF requires the use of Pack URIs to access embedded resources.

Pack URI is a specific type of URI that points to a resource within a package (such as an assembly). The format of Pack URI consists of two parts:

• Authorization: application:///
• Path: AssemblyName;Version;component/Path

The path component specifies the location of the resource within the referenced assembly. To create a valid Pack URI, the slash after application: must be replaced with a comma. Additionally, reserved characters should be escaped.

For the code provided, the problem can be solved by replacing it with the following code:

ImageSource iconSource = new BitmapImage(
    new Uri("pack://application:,,,/AssemblyName;component/Resources/SomeImage.png"));
_icon.Source = iconSource;

This code constructs a valid Pack URI and assigns it to the image source. Make sure to set the image resource's Build Action to Resource to ensure it is embedded correctly.

Understanding Pack URIs is crucial for working with embedded resources in WPF. By integrating them into your code, you can easily set up image sources and enhance the functionality of your WPF applications.

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