【Tips】建立OnPropertyChanged。其中的方法簽章若沒有寫入，則預設為呼叫的成員名稱

using System.ComponentModel;
using System.Runtime.CompilerServices;

public class MyDataContext : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    public void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        //Console.WriteLine($"MyDataContext:OnPropertyChanged__{propertyName}");
    }
}