#323 - A Generic Class is a Template for a Class

A generic classs is a class that takes one or more type parameters, which it then uses in the definition of the class. It can be thought of as a template for a class.

1 public class ThingContainer<TParam>

2 {

3   private TParam theThing;

4 

5   public void SetThing(TParam newValue)

6   {

7     theThing = newValue;

8   }

9 }

You use a generic class by specifying a type for each of the type parameters.

1 ThingContainer<int> intContainer = new ThingContainer<int>();

2 intContainer.SetThing(5);

3 

4 ThingContainer<Dog> dogContainer = new ThingContainer<Dog>();

5 dogContainer.SetThing(new Dog("Kirby", 5));

In this example, we use a generic class to store an object of an arbitary type. We use one version of the class to store an int and another to store a Dog. Notice that wherever we use the name of the generic class to define an instance, we need to supply a typename (e.g. int, Dog) as a parameter.

原文地址:#323 - A Generic Class is a Template for a Class

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