C#

mucahit wrote:

but it returns the following error:
"ArgumentNullException was unhandled ,Value Cannot be null,Parameter Type"
but i dont know this error.

sam L wrote:

Hi there, I'm not sure if I followed what you meant here? Could you perhaps show me some sample code? I'd really appreciate it!

Factory[] factories = { new AFactory(), new BFactory(), etc };

int index = ??;

Factory f = factories[index];

List l = f.GetList();

dibya_2003 wrote:

Then you can use has code value in the switch statement.

class Program
{
    static void Main(string[] args) {
        List<Product> sapProducts = ProductFactory.GetProducts(new SAPFactory());
        List<Product> oracleProducts = ProductFactory.GetProducts(new OracleFactory());
    }
}
abstract class BaseFactory
{
    public abstract List<Product> GetProduct();
}

class SAPFactory : BaseFactory
{
    public override List<Product> GetProduct() {
        return new List<Product>();
    }
}

class OracleFactory : BaseFactory
{
    public override List<Product> GetProduct() {
        return new List<Product>();
    }
}

static class ProductFactory
{
    public static List<Product> GetProducts(BaseFactory factory) {
        return factory.GetProduct();
    }
}

Tina P wrote:

But when more than one thread hits the method at the same time

Object thisLock = new Object();
public static List<dataobject> GetList()

{

lock (thisLock)
{
    if (_list == null)

{

_list = new List<dataobject>();

etc etc
}</dataobject></dataobject>