Скачать или смотреть How to Display a Default View from the Prism OnDemand Module in WPF

Learn how to effectively manage and display the default view of your Prism OnDemand modules in WPF using a custom registry approach.
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This video is based on the question https://stackoverflow.com/q/63485506/ asked by the user 'Alan Sage' ( https://stackoverflow.com/u/6385266/ ) and on the answer https://stackoverflow.com/a/63485939/ provided by the user 'Haukinger' ( https://stackoverflow.com/u/5758420/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Displaying a Default View from Prism OnDemand Module in WPF

When working with the Prism framework in WPF, you may encounter a situation where you need to load and display a module's default view on a button click. This can be particularly tricky when your modules are set up with the [Module(OnDemand = true)] attribute. In this post, we will explore a cleaner approach to manage this functionality, moving away from brittle implementations to something more organized and robust.

Understanding the Problem

You are using a DirectoryModuleCatalog to load modules dynamically. Upon discovering the modules, you cache their names and map them to buttons within your application. When a button is clicked, a command is triggered that aims to load the module and navigate to its associated default view. However, the current approach requires you to rely on naming conventions, which can be untidy and hard to manage.

Here's a snippet of your current implementation for loading and displaying a module:

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While this technically works, you feel it's a weak solution, and you desire a more elegant way to embed and access additional information within the module itself before loading it.

Proposed Solution: Using a Module Registry

To enhance the modular design of your WPF application, we propose a registry mechanism. This involves creating an IModuleRegistry interface which allows modules to register their default views when they are initialized.

Step 1: Define the IModuleRegistry Interface

This interface will be responsible for managing the registration and retrieval of default views from your modules. Here's how it can be structured:

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Step 2: Implement the Module Registry

When your modules initialize, they can now inform the registry of their default view. As each module is loaded, it can call the RegisterDefaultView method to add its default view information. This decouples your view loading process from naming conventions and leverages the registry for clarity and maintainability.

Step 3: Register and Load Modules

After implementing the interface, you need to ensure that once all modules are loaded, your application can efficiently access and utilize the default view information. You may implement logic to parse through your registered views and navigate accordingly, improving code organization.

Step 4: Consider Architectural Requirements

Even in production code, you might want to segregate interfaces into different scopes, depending on your architectural requirements. Utilizing different interfaces for different scenarios can promote better design and cleaner code practices.

Conclusion

By implementing a module registry, you enhance the flexibility and maintainability of your WPF application utilizing Prism. No longer relying on hard-coded naming conventions, this approach allows for a more modular and scalable architecture. As your application grows, maintaining and accessing module information becomes far more manageable.

Consider this technique as a practical solution for displaying the default views of your OnDemand modules in a clean and efficient way. Happy coding!