这种使用泛型的模式有名称吗？

Question

//this class (or interface if you like) is set up as generic...
public abstract class GenericBase<T> 
{
    public T PerformBasicTask(T in) { ... }
}

//... but is intended to be inherited by objects that close the generic...
public class ConcreteForDates:GenericBase<DateTime>
{
    public DateTime PerformSpecificTask(DateTime in) { ... }
}

//... so that consuming code never knows that a generic is involved
var myDateConcrete = new ConcreteForDates(); //look ma, no GTP!
//These two methods look alike, and there is no generic type inference,
//even with PerformBasicTask().
var basicResult = myDateConcrete.PerformBasicTask(DateTime.Now);
var specificResult = myDateConcrete.PerformSpecificTask(DateTime.Today);

//does not compile because T is understood by inheritance to be a DateTime,
//even though PerformBasicTask()'s implementation may well handle an int.
var anotherBasicResult = myDateConcrete.PerformBasicTask(1);

我已经多次看到并使用过这种模式,它对于在一系列特定类型的子类中提供通用功能非常有用.例如,这可以是控制器/演示者的模型,该控制器/演示者特定于一种域对象,该对象是该类用于控制的页面的核心; 检索/持久性等基本操作可能使用100%的常用功能,但绑定/解除绑定可能非常具体.

这种泛型声明模式是否有名称,而不会将通用暴露给最终用户？

Answer 1

我相信这不是一种模式，而是 .NET Framework 的泛型类型子系统的细节，该子系统通过用具体类型（在您的示例 DateTime 中）替换泛型类型参数来在运行时生成具体类型。所有其他有关共享共同行为的事物都称为继承