Interface isolation principle of C# object-oriented design principle

Interface Isolation Principle (ISP)

Definition: Using multiple dedicated interfaces is better than using a single total interface. That is, don't put all the eggs in one basket.
Benefits: It is more flexible and convenient. What you don’t want to implement or do not need to be implemented can be implemented without implementation.
Explanation:
Most people like to use one interface to declare all the methods needed, but ISP suggests that using multiple special interfaces is better than using a single total interface. That is, if there are more methods in one interface, it will not be very convenient to implement.

Example 1:

using System;
using ;
using ;
using ;
using ;

namespace Interface isolation principle
{
    /// &lt;summary&gt;
    /// Define an interface for learning computers    /// &lt;/summary&gt;
    public interface ILearnComputer
    {
    }

    /// &lt;summary&gt;
    /// Define an interface for surfing the Internet    /// &lt;/summary&gt;
    public interface INetComputer
    { }

    /// &lt;summary&gt;
    /// Define a student computer class to realize the interface of learning computers and the interface of surfing the Internet computer    /// &lt;/summary&gt;
    public class StudentComputer : ILearnComputer, INetComputer
    {
        public void Learn()
        {
            ("study");
        }

        public void NetPlay()
        {
            ("On the Internet");
        }
    }
}

In the above example code, two interfaces are defined, and a specific computer class implements two interfaces. If you only want to access the Internet, you can only implement the Internet interface; if you only want to learn, you can only implement the learning interface.

Example 2:

using System;
using ;
using ;
using ;
using ;

namespace Interface isolation principle
{
    /// &lt;summary&gt;
    /// Define an interface for learning computers    /// &lt;/summary&gt;
    public interface ILearnComputer
    {
    }

    /// &lt;summary&gt;
    /// Define an interface for surfing the Internet    /// &lt;/summary&gt;
    public interface INetComputer
    { }

    /// &lt;summary&gt;
    /// Define an abstract class for student computers to realize the interface of learning computers and the interface of Internet computers    /// &lt;/summary&gt;
    public abstract class StudentComputer : ILearnComputer, INetComputer
    {
        public abstract void Learn();

        public abstract void NetPlay();
    }
}

During specific operations, abstract classes and interfaces are used in conjunction with each other. Use abstract classes to implement interfaces, and use abstract classes to declare variables when calling.

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