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C # override base class collection type

I have a base class with

     public abstract class BaseClass
    {
     ICollection<int> Numbers {get;set;}
    }

Is there a way to get the result below?

    public abstract class SubClass : BaseClass
    {
     override ObservableCollection<int> Numbers {get;set;}
    }

So, does the subclass have an observable collective, or is there a design pattern I could implement?

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3 answers


Generics can help you achieve similar behavior:



public abstract class BaseClass<T> where T : ICollection<int>
{
    public T Numbers { get; set; }
}

public abstract class SubClass : BaseClass<ObservableCollection<int>>
{

}
+6


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You cannot override it.

One solution might be to create a new property with a different name:

public abstract class SubClass : BaseClass
{
    public ObservableCollection<int> ObservableNumbers => (ObservableCollection<int>)Numbers;
}


Or as follows: (if you really need to install it)

public abstract class SubClass : BaseClass
{
    public ObservableCollection<int> ObservableNumbers
    {
        get { return (ObservableCollection<int>)Numbers; }
        set { Numbers = value; }
    }
}

And don't forget to make the property Numbers

public or internal!

0


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You can try as below by adding the keyword "new" 

public abstract class BaseClass
    {
        public virtual ICollection<int> Numbers { get; set; }
    }

    public abstract class SubClass : BaseClass
    {
        public new ObservableCollection<int> Numbers { get; set; }
    }
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