Cache middle tier Object based on its properties

[AjitGoel]

it is possible to cache an object based on its properties?? To give
more details, I have an entity object whose different properties are
set from different and expensive web services. i have some sample code
down below. I want instances of object class1 to be cached for
different values of a1 and a2.
Do we have built in functionality in ASP.NET that can do this(probably
by setting some class level attributes) or I will have to write
customcode for this?? Eg:

Class class1
{
private int _a1;
private int _a2;

public a(int a1, int a2)
{
this._a1= a1;
this._a2= a2;
}

public int a3
{
get
{
<expensive operation 1 to fill>
}
}

public int a4
{
get
{
<expensive operation 2 to fill>
}
}
}

 

[Brian Williams]

You should be able to use Policy Injection Aplication Block, I haven't
worked with it enough to be sure it will work for you, but... I beleive you
would have to use an Interface and setup a matching rule policy or something
like that.

http://msdn2.microsoft.com/en-us/library/bb410104.aspx

Regards,
Brian K. Williams