luismts

var isValidEmail = User.Email.Validate();

luismts

using Plugin.ValidationRules;
using ValidationRulesTest.Validations;
using ValidationRulesTest.Models;

namespace ValidationRulesTest.ViewModels
{
    public class Example2ViewModel
    {
        public Example2ViewModel()
        {

luismts

using Plugin.ValidationRules;

namespace ValidationRulesTest.Models
{
    public class User
    {
        public User()
        {
            LastName = new ValidatableObject<string>();
            Name = new ValidatableObject<string>();

luismts

<Entry Text="{Binding Name.Value, Mode=TwoWay}" />
<Label Text="{Binding Name.Error}" TextColor="Red" HorizontalTextAlignment="Center" />

luismts

var errors = Name.Errors;
var error = Name.Error;

luismts

_unit1 = new ValidationUnit(Name, LastName, Email);
var isValidUnit = _unit1.Validate();

luismts

public bool Validate()
{
    var isValidName = _name.Validate();
    var isValidLastname = _lastname.Validate();
    var isValidEmail = _email.Validate();

    // Your logic here
    return isValidName && isValidLastname && isValidEmail; 
}

luismts

<Entry Text="{Binding Name.Value, Mode=TwoWay}" >
  <Entry.Behaviors>
    <behaviors:EventToCommandBehavior EventName="Unfocused" Command="{Binding ValidateUserNameCommand}" />
  </Entry.Behaviors>
</Entry>

luismts

var isValidEmail = Email.Validate();

luismts

//Email validations
Email.Validations.Add(new IsNotNullOrEmptyRule<string>{ ValidationMessage = "A email is required." });
Email.Validations.Add(new EmailRule<string> { ValidationMessage = "Email is not valid." });