OnPropertyChange并不在当前上下文中是否存在？ [英] OnPropertyChange does not exist in the current context?

问题描述

似乎无法看到我错了？该OnPropertyChange没有被recondnised任何建议。

Cant seem to see where I am going wrong? the OnPropertyChange is not being recondnised any suggestions?

  public class MedicationList : INotifyPropertyChanged 
{



    public int MedicationID { get; set; }

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

        }
    }
}

}

}

的修改的我已经加入公共类MedicationList：INotifyPropertyChanged的

推荐答案

您应该实施的 INotifyPropertyChanged的接口，它有一个的PropertyChanged 事件声明。如果某些对象的属性改变，你应该引发此事件。正确执行：

You should implement INotifyPropertyChanged interface, which has single PropertyChanged event declared. You should raise this event if some of object's properties changed. Correct implementation:

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));
    }
}

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