How to Properly Set WPF Image Sources Using Pack URIs in Code?

Set WPF image source using package URI in code

In WPF, when an image is embedded as a resource in a project, the source of the image is usually set in code. However, setting the source using a stream like in the provided code snippet may not display the image.

The solution lies in using package URIs, a special URI type that accesses embedded resources in an assembly.

Create package URI

Package URIs follow a specific format:

<code>pack://application:,,,/**程序集简称**;component/**路径**</code>

• Authority: application:///
• Path: The path of the resource in the referenced assembly, including its relative path in the project folder. The three slashes after "application:" should be replaced with commas.

Example

In your case the package URI for the image "SomeImage.png" would be:

<code>pack://application:,,,/YourAssemblyName;component/SomeImage.png</code>

Use package URI in code

To set the image source using a package URI, you can use the following code:

Image finalImage = new Image();
...
BitmapImage logo = new BitmapImage();
logo.BeginInit();
logo.UriSource = new Uri("pack://application:,,,/YourAssemblyName;component/SomeImage.png");
logo.EndInit();
...
finalImage.Source = logo;

Alternatively, you can use a shorter constructor:

finalImage.Source = new BitmapImage(new Uri("pack://application:,,,/YourAssemblyName;component/SomeImage.png"));

Key Notes

• Make sure the image resource has a build action of "Resource" in the project properties.
• Remember to replace the three slashes after "application:" with commas.
• Escape reserved characters like "%" and "?" using the appropriate encoding.

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