Abstract class cast operator

问题

Poco items are wrapped.

abstract class AbstractPocoUI<T> {
    protected T PocoItem;
}

class PocoA {

}
class PocoAUI:AbstractPocoUI<PocoA> {

}

I want to do something like this

var c = new ObservableCollection<PocoAUI>(collectionOfTypePocoA.Cast<PocoAUI>());

How can i override cast operator in abstract class? What should i do in AbstractPocoUI to get for example PocoAUI with PocoA in PocoItem field ? Thanks.

回答1:

You can implement IConvertible interface or create a TypeConverter but casting cannot be overriden.

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Have a look at Implicit Operator overloading here.

来源：https://stackoverflow.com/questions/5990663/abstract-class-cast-operator