2.9.txt

《Microsoft Visual C# .NET 2003开发技巧大全》源代码

Listing 2.9 Abstract Classes Requiring Implementation public abstract class
MediaDevice
{
bool on = false;
virtual public void TurnOn()
{
on = true;
}
virtual public void TurnOff()
{
on = false;
}
public abstract int VolumeLevel
{
get;
set;
}
}