Implementing INotifyPropertyChanged in C# 6 C# with Example

The implementation of INotifyPropertyChange can be error-prone, as the interface requires specifying property 
name as a string. In order to make the implementation more robust, an attribute CallerMemberName can be used. 
class C : INotifyPropertyChanged 
{ 
// backing field 
int offset; 
//  property 
public int Offset 
{ 
get 
{ 
return offset; 
} 
set 
{ 
if (offset == value) 
return; 
offset = value; 
RaisePropertyChanged(); 
} 
} 
// helper method for raising PropertyChanged event 
void RaisePropertyChanged([CallerMemberName] string propertyName = null) => 
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 
//  interface  implemetation 
public event PropertyChangedEventHandler PropertyChanged; 
} 
If you have several classes implementing INotifyPropertyChanged, you may find it useful to refactor out the 
interface implementation and the helper method to the common base class: 
class NotifyPropertyChangedImpl : INotifyPropertyChanged 
{ 
protected void RaisePropertyChanged([CallerMemberName] string propertyName = null) => 
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 
//  interface  implemetation 
public event PropertyChangedEventHandler PropertyChanged; 
} 
class C : NotifyPropertyChangedImpl 
{ 
int offset; 
public int Offset 
{ 
get { return offset; } 
set { if (offset != value) { offset = value; RaisePropertyChanged(); } } 
} 
}