In this blog post, you will learn how to validate xaml elements using Xamarin
Community Toolkit in Xamarin.Forms App
Introduction
Part 1: https://xamarinmonkeys.blogspot.com/2021/11/xamarinforms-validation-using-xamarin.html
Xamarin.Forms code runs on multiple platforms - each of which has its own
filesystem. This means that reading and writing files is most easily done
using the native file APIs on each platform. Alternatively, embedded resources
are a simpler solution to distribute data files with an app.
Xamarin Community Toolkit
Xamarin Community Toolkit is a collection of reusable elements for mobile
development with Xamarin.Forms, including animations, behaviors, converters,
effects, and helpers. It simplifies and demonstrates common developer tasks
when building iOS, Android, macOS, WPF and UWP apps using Xamarin.Forms.
The Xamarin Community Toolkit is available as a Visual Studio NuGet package
for new or existing Xamarin.Forms projects.
Validation Behaviours
1. CharactersValidationBehavior
2. EmailValidationBehavior
3. MultiValidationBehavior
4. NumericValidationBehavior
5. RequiredStringValidationBehavior
6. TextValidationBehavior
7. UriValidationBehavior
References
- https://docs.microsoft.com/en-us/xamarin/community-toolkit/behaviors/
- https://github.com/xamarin/XamarinCommunityToolkit
Prerequisites
- Visual Studio 2017 or later (Windows or Mac)
Let's Start
Setting up a Xamarin.Forms Project
Start by creating a new Xamarin.Forms project. You will learn more by going
through the steps yourself.
Create a new or existing Xamarin forms(.Net standard) Project. With Android
and iOS Platform.
Install Xamarin.CommunityToolkit NuGet
Install the following Nuget from Nuget Manager In your Visual Studio.
Xamarin.CommunityToolkit
NumericValidation
NumericValidationBehavior is a behavior that allows the user to determine if
text input is a valid numeric value. For example, an Entry control can be
styled differently depending on whether a valid or an invalid numeric input is
provided.
Xaml code
More details
https://docs.microsoft.com/en-us/xamarin/community-toolkit/behaviors/numericvalidationbehavior
Result
RequiredStringValidation
RequiredStringValidationBehavior is a behavior that allows the user to
determine if text input is equal to specific text. For example, an Entry
control can be styled differently depending on whether a valid or an invalid
text input is provided.
Xaml code
More details
https://docs.microsoft.com/en-us/xamarin/community-toolkit/behaviors/requiredstringvalidationbehavior
Result
TextValidation
TextValidationBehavior is a behavior that allows the user to validate a given
text depending on specified parameters. By adding this behavior to an Entry
control it can be styled differently depending on whether a valid or an
invalid text value is provided.
Xaml Code
More details
https://docs.microsoft.com/en-us/xamarin/community-toolkit/behaviors/textvalidationbehavior
Result
UriValidation
UriValidationBehavior is a behavior that allows users to determine whether or
not text input is a valid URI. For example, an Entry control can be styled
differently depending on whether a valid or an invalid URI is provided.
Xaml code
More details
https://docs.microsoft.com/en-us/xamarin/community-toolkit/behaviors/urivalidationbehavior
Result
Conclusion
I hope you have understood how to validate xaml elements using Xamarin
Community Toolkit in Xamarin.Forms App
Thanks for reading. Please share your comments and feedback. Happy Coding :)
