C# Language INotifyPropertyChanged interface Implementing INotifyPropertyChanged in C# 6
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(); } }
}
}
