[C# UWP] A base class for all view models.

BindableBase.cs

/// <summary>
///     Implementation of <see cref="INotifyPropertyChanged" /> to simplify models.
/// </summary>
public abstract class BindableBase : INotifyPropertyChanged
{
    /// <summary>
    ///     Multicast event for property change notifications.
    /// </summary>
    public event PropertyChangedEventHandler PropertyChanged;

    /// <summary>
    ///     Checks if a property already matches a desired value.  Sets the property and
    ///     notifies listeners only when necessary.
    /// </summary>
    /// <typeparam name="T">Type of the property.</typeparam>
    /// <param name="storage">Reference to a property with both getter and setter.</param>
    /// <param name="value">Desired value for the property.</param>
    /// <param name="propertyName">
    ///     Name of the property used to notify listeners.
    ///     This value is optional and can be provided automatically when invoked
    ///     from compilers that support CallerMemberName.
    /// </param>
    /// <returns>
    ///     True if the value was changed, false if the existing value matched the
    ///     desired value.
    /// </returns>
    protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
    {
        if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
        if (Equals(storage, value)) return false;

        storage = value;
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        return true;
    }
}