Validating editors in the UI before data posting

In your application, certain validation rules can be enforced at the application level before data is submitted to the database. This approach can improve UX by promptly notifying users of any invalid inputs before they attempt to save changes. The .NET MAUI Community Toolkit provides various built-in validation behaviors designed to streamline common input validation tasks. We will use these behaviors to change the appearance of editors and disable saving when a user types invalid text.

Getting ready

Begin with the project you created upon completing the previous recipe (Handling errors while saving data to a database). You can access this project at https://github.com/PacktPublishing/.NET-MAUI-Cookbook/tree/main/Chapter04/c4-DatabaseValidation.

The code specific to this recipe is available at https://github.com/PacktPublishing/.NET-MAUI-Cookbook/tree/main/Chapter04/c4-UIValidation.

How to do it…

Let’s disable...