绑定到引用保持不变的对象时，将忽略PropertyChanged

using System.ComponentModel;

public class MyModel : INotifyPropertyChanged
{
    private string _myProperty;

    public string MyProperty
    {
        get => _myProperty;
        set
        {
            if (_myProperty != value)
            {
                _myProperty = value;
                OnPropertyChanged(nameof(MyProperty));
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

using System.Collections.ObjectModel;

public class MyViewModel
{
    public ObservableCollection<MyModel> Items { get; set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<MyModel>();
    }
}

public void UpdateMyModel()
{
    MyModel newModel = new MyModel();
    // 设置新模型的属性
    newModel.MyProperty = "New Value";

    // 重新分配引用
    MyModel = newModel; // 这将触发绑定更新
}