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  1. using System;
  2. using System.ComponentModel;
  3. using System.Runtime.CompilerServices;
  4. using Windows.UI.Xaml.Data;
  5.  
  6. namespace AppNamespace.Common
  7. {
  8.     /// <summary>
  9.     /// Implementation of <see cref="INotifyPropertyChanged"/> to simplify models.
  10.     /// </summary>
  11.     [Windows.Foundation.Metadata.WebHostHidden]
  12.     public abstract class BindableBase : INotifyPropertyChanged
  13.     {
  14.         /// <summary>
  15.         /// Multicast event for property change notifications.
  16.         /// </summary>
  17.         public event PropertyChangedEventHandler PropertyChanged;
  18.  
  19.         /// <summary>
  20.         /// Checks if a property already matches a desired value.  Sets the property and
  21.         /// notifies listeners only when necessary.
  22.         /// </summary>
  23.         /// <typeparam name="T">Type of the property.</typeparam>
  24.         /// <param name="storage">Reference to a property with both getter and setter.</param>
  25.         /// <param name="value">Desired value for the property.</param>
  26.         /// <param name="propertyName">Name of the property used to notify listeners.  This
  27.         /// value is optional and can be provided automatically when invoked from compilers that
  28.         /// support CallerMemberName.</param>
  29.         /// <returns>True if the value was changed, false if the existing value matched the
  30.         /// desired value.</returns>
  31.         protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] String propertyName = null)
  32.         {
  33.             if (object.Equals(storage, value)) return false;
  34.  
  35.             storage = value;
  36.             this.OnPropertyChanged(propertyName);
  37.             return true;
  38.         }
  39.  
  40.         /// <summary>
  41.         /// Notifies listeners that a property value has changed.
  42.         /// </summary>
  43.         /// <param name="propertyName">Name of the property used to notify listeners.  This
  44.         /// value is optional and can be provided automatically when invoked from compilers
  45.         /// that support <see cref="CallerMemberNameAttribute"/>.</param>
  46.         protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
  47.         {
  48.             var eventHandler = this.PropertyChanged;
  49.             if (eventHandler != null)
  50.             {
  51.                 eventHandler(this, new PropertyChangedEventArgs(propertyName));
  52.             }
  53.         }
  54.     }
  55. }
  56.  
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https://ideone.com/KIvoJ
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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