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ViewModelBase class which implements INotifyPropertyChanged in C#
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public abstract class ViewModelBase : 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 virtual bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null) | |
{ | |
if (object.Equals(storage, value)) return false; | |
storage = value; | |
// Log.DebugFormat("{0}.{1} = {2}", this.GetType().Name, propertyName, storage); | |
this.OnPropertyChanged(propertyName); | |
return true; | |
} | |
/// <summary> | |
/// Notifies listeners that a property value has changed. | |
/// </summary> | |
/// <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 <see cref="CallerMemberNameAttribute"/>.</param> | |
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) | |
{ | |
var eventHandler = this.PropertyChanged; | |
if (eventHandler != null) | |
eventHandler(this, new PropertyChangedEventArgs(propertyName)); | |
} | |
} |
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