dynamic classes

[Guest]

Hi

I have 2 classes, layout1 and layout2, both return different table layouts

In my controlling program I create one of these tables using

Table myTable = new layout1

I need to parameterise the 'layout1' part of this statement, so I can choose a different layout at runtime. Is this possible or is there a better way of doing this

Thank
Kieran

 

[Niki Estner]

Table myTable;
if (...) myTable = new layout1 else myTable = new layout2;

I'm not really sure if I got your question...

Niki

Hi,

I have 2 classes, layout1 and layout2, both return different table layouts.

In my controlling program I create one of these tables using:

Table myTable = new layout1;

I need to parameterise the 'layout1' part of this statement, so I can

choose a different layout at runtime. Is this possible or is there a better
way of doing this?

 

[Guest]

Hi

Thanks for your reply, I was hoping though to feed in the class name though, e.

string myClass = 'layout1

Table myTable = new myClas

I know the above wont work but I hope this explains what I'm trying to do. I'm effectively trying to decide the class to use at runtime?

Thank
Kieran

 

[Niki Estner]

Ok, that explains at least what you want to do: You can use
Activator.CreateInstance("name-of-your-assembly", "layout1").Unwrap(), to
create an instance of a class by its name.

However, the more "type-safe" approach would be something like:

Type myClass = typeof(layout1);
....
Table myTable = Activator.CreateInstance(myClass);

Or you could implement IClonable in all your classes, and write:

ICloneable myClass = new layout1;
....
Table myTable = myClass.Clone();

(I think this one is GoF pattern, but don't remember it's name)

Niki

Hi,

Thanks for your reply, I was hoping though to feed in the class name though, e.g

string myClass = 'layout1'

Table myTable = new myClass

I know the above wont work but I hope this explains what I'm trying to do.

I'm effectively trying to decide the class to use at runtime?.