c# - 从通用接口(interface)继承

Question

我不知道如何解决通用接口(interface)的问题。

通用接口(interface)代表对象的工厂:

interface IFactory<T>
{
    // get created object
    T Get();    
}

接口(interface)代表计算机工厂(Computer类)specyfing通用工厂:

interface IComputerFactory<T> : IFactory<T> where T : Computer
{
    // get created computer
    new Computer Get();
}

通用接口(interface)表示对象的特殊工厂，这些对象是可克隆的(实现接口(interface) System.ICloneable):

interface ISpecialFactory<T> where T : ICloneable, IFactory<T>
{
    // get created object
    T Get();
}

类代表计算机工厂(计算机类)和可克隆对象:

class MyFactory<T> : IComputerFactory<Computer>, ISpecialFactory<T>
{

}

我在 MyFactory 类中收到编译器错误消息:

The type 'T' cannot be used as type parameter 'T' in the generic type or method 'exer.ISpecialFactory<T>'. There is no boxing conversion or type parameter conversion from 'T' to 'exer.IFactory<T>'.   

The type 'T' cannot be used as type parameter 'T' in the generic type or method 'exer.ISpecialFactory<T>'. There is no boxing conversion or type parameter conversion from 'T' to 'System.ICloneable'.  

Answer 1

不确定这是否是错字，但应该这样:

interface ISpecialFactory<T>
        where T : ICloneable, IFactory<T>

真的去过

interface ISpecialFactory<T> : IFactory<T>
        where T : ICloneable

真的，我认为这可能是您想要做的:

public class Computer : ICloneable
{ 
    public object Clone(){ return new Computer(); }
}

public interface IFactory<T>
{
    T Get();    
}

public interface IComputerFactory : IFactory<Computer>
{
    Computer Get();
}

public interface ISpecialFactory<T>: IFactory<T>
    where T : ICloneable
{
    T Get();
}

public class MyFactory : IComputerFactory, ISpecialFactory<Computer>
{
    public Computer Get()
    {
        return new Computer();
    }
}

实例:http://rextester.com/ENLPO67010