A small validation library for WPF and Avalonia which uses a fluent interface and allows display messages near controls in GUI with MVVM. Inspired FluentValidation by Jeremy Skinner.
public class CarViewModel : ValidatableObject
{
public CarViewModel()
{
Validator = GetValidator();
}
private IObjectValidator GetValidator()
{
var builder = new ValidationBuilder<CarViewModel>();
builder.RuleFor(vm => vm.Make).NotEmpty();
builder.RuleFor(vm => vm.Model).NotEmpty().WithMessage("Please specify a car model");
builder.RuleFor(vm => vm.Mileage).GreaterThan(0).When(model => model.HasMileage);
builder.RuleFor(vm => vm.Vin).Must(BeAValidVin).WithMessage("Please specify a valid VIN");
builder.RuleFor(vm => vm.Description).Length(10, 100);
return builder.Build(this);
}
private bool BeAValidVin(string vin)
{
// Custom vin validating logic goes here.
}
// Properties with realization INotifyPropertyChanged goes here.
}About all features you can read in the documentation.