c# - 当前上下文中不存在 OnPropertyChange？

Question

似乎看不出我哪里出错了？ OnPropertyChange 没有被重新认可有什么建议吗？

  public class MedicationList : INotifyPropertyChanged 
{



    public int MedicationID { get; set; }

    public string Description
    {
        get
        {
            return Description;
        }
        set
        { 
            OnPropertyChanged( "Description" );
            Description = value;

        }
    }
}

编辑 我添加了public class MedicationList : INotifyPropertyChanged

Answer 1

你应该实现 INotifyPropertyChanged接口(interface)，其中声明了单个 PropertyChanged 事件。如果某些对象的属性发生变化，您应该引发此事件。正确实现:

public class MedicationList : INotifyPropertyChanged
{
    private string _description; // storage for property value

    public event PropertyChangedEventHandler PropertyChanged;

    public string Description
    {
        get { return _description; }
        set
        {
            if (_description == value) // check if value changed
                return; // do nothing if value same

            _description = value; // change value
            OnPropertyChanged("Description"); // pass changed property name
        }
    }

    // this method raises PropertyChanged event
    protected void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null) // if there is any subscribers 
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}