在 C 6 中实现 INotifyPropertyChanged

INotifyPropertyChange 的实现可能容易出错，因为接口需要将属性名称指定为字符串。为了使实现更加健壮，可以使用属性 CallerMemberName。

class C : INotifyPropertyChanged
{
    // backing field
    int offset;
    // property
    public int Offset
    {
        get
        {
            return offset;
        }
        set
        {
            if (offset == value)
                return;
            offset = value;
            RaisePropertyChanged();
        }
    }

    // helper method for raising PropertyChanged event
    void RaisePropertyChanged([CallerMemberName] string propertyName = null) =>
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

    // interface implemetation
    public event PropertyChangedEventHandler PropertyChanged;
}

如果你有几个实现 INotifyPropertyChanged 的类，你可能会发现将接口实现和辅助方法重构为公共基类很有用：

class NotifyPropertyChangedImpl : INotifyPropertyChanged
{
    protected void RaisePropertyChanged([CallerMemberName] string propertyName = null) =>
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

    // interface implemetation
    public event PropertyChangedEventHandler PropertyChanged;
}

class C : NotifyPropertyChangedImpl
{
    int offset;
    public int Offset
    {
        get { return offset; }
        set { if (offset != value) { offset = value; RaisePropertyChanged(); } }
    }
}