什么是使用界面的优势在哪里？ [英] What is the advantage of using Interface?

问题描述

有什么用使用界面？

我听说，这是用来代替多重继承和数据隐藏，也可以用它做。

I heard that it is used instead of multiple inheritance and data-hiding can also be done with it.

有没有其他的优势，哪里有地方接口使用，以及如何能程序员识别接口是必要的？

Is there any other advantage, where are the places interface is used, and how can a programmer identify that interface is needed?

与显式接口实现和隐式接口实现？

推荐答案

要解决隐性/显性的问题，比方说，两个不同的接口有相同的声明：

To tackle the implicit/explicit question, let's say that two different interfaces have the same declaration:

interface IBiographicalData

    {
       string LastName
       {
          get;
          set;
       }

    }

    interface ICustomReportData
    {
       string LastName
       {
          get;
          set;
       }
    }

和你有一个类实现两个接口：

And you have a class implementing both interfaces:

class Person : IBiographicalData, ICustomReportData
{
    private string lastName;

    public string LastName
    {
        get { return lastName; }
        set { lastName = value; }
    }
}

类Person的隐的同时实现了接口，因为你得到了相同的输出与以下code：

Class Person Implicitly implements both interface because you get the same output with the following code:

Person p = new p();
IBiographicalData iBio = (IBiographicalData)p;
ICustomReportData iCr = (ICustomReportData)p;

Console.WriteLine(p.LastName);
Console.WriteLine(iBio.LastName);
Console.WriteLine(iCr.LastName);

不过，要的明确的实施，可以修改人，像这样的类：

However, to explicitly implement, you can modify the Person class like so:

class Person : IBiographicalData, ICustomReportData
{
    private string lastName;

    public string LastName
    {
        get { return lastName; }
        set { lastName = value; }
    }

    public string ICustomReportData.LastName
    {
        get { return "Last Name:" + lastName; }
        set { lastName = value; }
    }
}

现在的code：

Console.WriteLine(iCr.LastName);

是pfixed其中$ p $姓。

Will be prefixed with "Last Name:".

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