public static void Main()
{
VersionAssembly240 obj1 = new VersionAssembly240();
VersionAssembly250 obj2 = new VersionAssembly250();
VersionAssembly260 obj3 = new VersionAssembly260();
ChooseRightInstance(null, obj2, null, "v25");
}
public static void ChooseRightInstance(VersionAssembly240 obj1, VersionAssembly250 obj2, VersionAssembly260 obj3, string version)
{
IVersionAssembly obj; //declare the object outside the if, as an instance of the interface
if (version == "v24")
{
obj = obj1;
}
else if (version == "v25")
{
obj = obj2;
}
else
{
obj = obj3;
}
Console.WriteLine(obj.example()); //can call the example() method because the interface defines it
}