#1,039 – Deriving from a Generic Class

A generic class includes one or more type parameters, allowing you to later declare a variable using a constructed type by specifying type arguments for each type parameter.

If you have an existing generic class, you can define a new class that inherits from the generic class.

Assume that we have a List<T> type, i.e. we can construct the type as follows:

            List<int> someInts = new List<int>();

We can also define a new class that inherits from List<T> and makes use of its type parameter as follows:

    public class ListPlus<T> : List<T>
    {
        public void AddTwoItems(T thing1, T thing2)
        {
            base.Add(thing1);
            base.Add(thing2);
        }
    }

We can now construct the new type by providing a type argument.

            ListPlus<Dog> dogs = new ListPlus<Dog>();
            Dog fido = new Dog("Fido");
            Dog bowser = new Dog("Bowser");
            dogs.AddTwoItems(fido, bowser);
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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,039 – Deriving from a Generic Class

  1. Pingback: Dew Drop – February 24, 2014 (#1729) | Morning Dew

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