样品代码：
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(String propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this,new PropertyChangedEventArgs(propertyName));
}
}
VS：
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(String propertyName)
{
if (PropertyChanged!= null)
{
PropertyChanged(this,new PropertyChangedEventArgs(propertyName));
}
}
为什么我总是看到人们创建将PropertyChanged分配给“处理程序”而不是仅仅使用它？
