Implementing INotifyPropertyChanged
It's changed a lot over the years. Here is the latest iteration that I use.
1 private BindingList<string> _Area = new BindingList<string>();
2 public BindingList<string> Area
3 {
4 get => _Area;
5 set => SetField<BindingList<string>>(ref _Area, value);
6 }
7
8 //...
9
10 public event PropertyChangedEventHandler PropertyChanged;
11
12 protected void SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
13 {
14 field = value;
15 PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
16 }
Suppose that the value you are setting with SetField is a property of a Model object. You may get an error that says, "A non ref-returning property or indexer may not be used as an out or ref value." There is an easy fix for this.
private BindingList<string> _Area = new BindingList<string>();
public BindingList<string> Area
{
get => _Area;
set => _Area = SetField<BindingList<string>>(value);
}
//...
public event PropertyChangedEventHandler PropertyChanged;
protected void SetField<T>(T value, [CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
return value;
}