在下面的示例中,children 实际上会指向同一个 base 实例
该示例使用缓存,但它可以是其他任何东西(会话、应用程序状态等)。
public class BaseClass
{
private string _name;
private DateTime _login;
public string Name
{
get
{
return Instance._name;
}
set
{
_name = value;
}
}
public DateTime Login
{
get
{
return Instance._login;
}
set
{
_login = value;
}
}
public static BaseClass Instance
{
get
{
// check if null, return a new instance if null etc...
return HttpContext.Current.Cache["BaseClassInstance"] as BaseClass;
}
set
{
HttpContext.Current.Cache.Insert("BaseClassInstance", value);
}
}
}
public class ChildA : BaseClass
{
public string SchoolName { get; set; }
public string ClassName { get; set; }
}
public class childB : BaseClass
{
public string StreetAdrees { get; set; }
}
测试它:
BaseClass.Instance = new BaseClass() { Login = DateTime.Now, Name = "Test" };
ChildA ch = new ChildA();
ChildA ch2 = new ChildA();
childB chb = new childB();
Response.Write(ch.Login.Millisecond);
Response.Write("<BR/>");
Response.Write(chb.Login.Millisecond);
结果:
906
906