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Catel is an application development platform with the focus on MVVM (WPF, Universal Windows Platform, Xamarin.Android, Xamarin.iOS and Xamarin.Forms). The goal of Catel is to provide a complete set of modular functionality for Line of Business applications written in any .NET technology, from client to server.

Catel distinguishes itself by unique features to aid in the development of MVVM applications and server-side application development. Since Catel focuses on Line of Business applications, it provides professional support and excellent documentation which ensures a safe bet by professional companies and developers.

For documentation, please visit the documentation portal

Below are a few major features that are available in Catel.

Catel.Core is the library you want to include in all your projects, whether you are writing a UI project or not. It contains lots of useful helper methods. The most important features are listed below:

• Argument validation (e.g. Argument.IsNotNull(() => myArgument))
• Caching
• Data (ModelBase, PropertyBag, Validation)
• IoC (ServiceLocator, TypeFactory)
• Logging (LogManager, Log, several log listeners)
• Messaging
• Reflection (same reflection API for every supported platform)
• Serialization (BinarySerializer, XmlSerializer and more)
• Weak references (WeakEventListener)

And more....

Catel.MVVM is the library you want to include when you are writing a UI project (e.g. WPF, UWP, Xamarin) and you want to use the MVVM pattern. Catel is the only MVVM library that has context-aware view and view-model creation, which can be used to solve the nested user controls problem.

The most important features are listed below:

• Auditing
• Collections (FastObservableCollection)
• Commands (Command, TaskCommand, etc)
• Converters (tons of converters out of the box)
• Services
  • CameraService
  • LocationService
  • MessageService
  • NavigationService
  • OpenFileService
  • PleaseWaitService
  • SaveFileService
  • UIVisualizerService
• View models
  • Automatic validation
  • Automatic mappings from model to view model
• Views
  • DataWindow
  • UserControl
  • Window

This model has automatic change notifications and validation.

public class Person : ValidatableModelBase
{
    public string FirstName { get; set; }

    public string LastName { get; set; }

    protected override void ValidateFields(List<IFieldValidationResult> validationResults)
    {
        if (string.IsNullOrWhitespace(FirstName))
        {
            validationResults.Add(FieldValidationResult.CreateError(nameof(FirstName), "First name is required"));
        }

        if (string.IsNullOrWhitespace(LastName))
        {
            validationResults.Add(FieldValidationResult.CreateError(nameof(LastName), "Last name is required"));
        }
    }    
}

This is a view model with:

• Automatic injection of the DataContext
• Automatic mapping of properties & validation from model => view model

public class PersonViewModel : ViewModelBase
{
    public PersonViewModel(Person person)
    {
        Argument.IsNotNull(() => person);

        Person = person;
    }

    [Model]
    private Person Person { get; set; }

    [ViewModelToModel]
    public string FirstName { get; set; }

    [ViewModelToModel]
    public string LastName { get; set; }
}

There are a lot of (both free & commercial) apps using Catel. This list provides a few examples that are built with Catel:

// todo: add wpf

// todo: add uwp

If you are planning on using WPF, there is a huge set (60+) of free open-source components available based on Catel. All these open source are developed by a company called WildGums (see http://www.wildgums.com) and provided to the community for free. The components are well maintained and being used in several commercial WPF applications.

For more information, see https://github.com/wildgums