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Hi All,
I'm having problems implementing a readonly interface to a set of classes.
Heres a simplification of the code:
interface IreadonlyBase
{ // Does gets only on base class
}
class baseclass : IreadonlyBase
{ // Does gets and sets as usual
}
interface IreadonlyDerived : Ireadonlybase
{ // Does gets only on derived class & base class
}
class derivedclass : baseclass, IreadonlyDervied
{ // Does gets and sets as usual
}
class container
{
private List<baseclass> baseclassitems;
public ReadOnlyCollection<Ireadonlybase> ReadOnlyBases
{
// Should return a readonly version of the baseclassitems that can be traversed
get{return new ReadOnlyCollection<IReadOnlyEntity>(baseclassitems )};
}
}
Problem is the compiler refuses to accept the baseclassitems as a list of Ireadonly even though each base class derives from Ireadonly, why can i not cast a List<baseclass> to List<Ireadonlybase> if every base is a Ireadonly base?
I don't want to have to recreate the baselist again (in terms of interfaces) just to access it in a readonly manner.
Is this a logical approach to the readonly problem or am i overlooking something completely more obvious!
Many thanks for any help you can give.
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