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Interface 或 abstract class?

我的班级如下:

namespace VGADevices.UsingAbstractClass
{
    public abstract class VGA
    {
        public abstract int H或izontalResolution { get; set; }
        public abstract int VerticalResolution { get; set; }
    }
    public class LCDScreen : VGA
    {
        public override int H或izontalResolution { get; set; }
        public override int VerticalResolution { get; set; }
    }
}  // namespace VGADevices.UsingAbstractClass

namespace VGADevices.UsingInterfaces
{
    public interface IVGA
    {
        int H或izontalResolution { get; set; }
        int VerticalResolution { get; set; }
    }
    public class LCDScreen : IVGA
    {
        public virtual int H或izontalResolution { get; set; }
        public virtual int VerticalResolution { get; set; }
    }
}  // namespace VGADevices.UsingInterfaces

客户代码:我选择:

class Computer
{
        public VGA VGAOutput { get; set; }
}

或

class Computer
{
        public IVGA VGAOutput { get; set; }
}

I read somewhere that using interfaces is better, but why? With abstract classes I can define an interface as well plus add data-members so why are interfaces the preferred method? Does binary replacement play a role here as well?

thank you

Chris

Answer 1

你可以继承(即执行)多个接口。您可以继承多种抽象课程。

Answer 2

该员额:

Most important features I see: Multiple inheritance (interface can implement multiple interfaces, abstract can inherit from only one) Homogeneity (I have two objects with the same interface, but they re really not they same object and shouldn t share any code)

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