Category.cs

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using System;
using PhotoSharingApp.Universal.ComponentModel;

namespace PhotoSharingApp.Universal.Models
{
    /// <summary>
    /// Represents a category.
    /// </summary>
    public class Category : ObservableObjectBase
    {
        private string _id;
        private string _name;

        /// <summary>
        /// Gets the data model validation result.
        /// Returns true, if it contains one or more errors.
        /// Otherwise, false.
        /// </summary>
        public bool HasErrors
        {
            get
            {
                // Globalization note: Yes, there's a literal string here, but it's coming from the model, and the view models
                // both depend on this specific string being present, and remove this string from any data being displayed to the user.
                // There's no need to localize it for the user's benefit.
                return string.IsNullOrWhiteSpace(_name)
                       || _name.Length < 2
                       || _name.StartsWith("my", StringComparison.CurrentCultureIgnoreCase);
            }
        }

        /// <summary>
        /// Gets or sets the Id.
        /// </summary>
        public string Id
        {
            get { return _id; }
            set
            {
                if (value != _id)
                {
                    _id = value;
                    NotifyPropertyChanged(nameof(Id));
                }
            }
        }

        /// <summary>
        /// Gets or sets the name.
        /// </summary>
        public string Name
        {
            get { return _name; }
            set
            {
                if (value != _name)
                {
                    _name = value;
                    NotifyPropertyChanged(nameof(Name));

                    // The name has changed, so we need to update the
                    // object's validation status.
                    NotifyPropertyChanged(nameof(HasErrors));
                }
            }
        }
    }
}