在属性更改之前处理事件
本文关键字:处理事件 属性 | 更新日期: 2024-10-19 04:19:35
是否有一个事件处理程序允许我在类的变量更改值之前做一些事情?我只知道INotifyPropertyChanged/OnPropertyChanged,但那是在修改了值之后。
INotifyPropertyChanging示例:
public class AClass : INotifyPropertyChanging
{
private int aField;
public int AProperty
{
get { return aField; }
set
{
OnPropertyChanging("AProperty");
aField = value;
}
}
private void OnPropertyChanging(string propertyName)
{
PropertyChanging(this, new PropertyChangingEventArgs(propertyName));
}
public event PropertyChangingEventHandler PropertyChanging = delegate { };
}
public class MyClass
{
public event Action NotifyBeforeChanged;
private int _value;
public int Value
{
get
{
return _value;
}
set
{
NotifyBeforeChanged();
_value = value;
}
}
}