C# 多态示例-优快云博客

本文通过一个C#程序示例介绍了多态的概念及应用。该程序包含一个基类 ImageBase 和两个派生类 ImageA 与 ImageB。通过在 Form1 类中切换 imgbase 的类型并调用其 func1 和 func2 方法，展示了多态行为。

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项目结构：

界面：

Form1.cs 代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace exe4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        ImageBase imgbase;
        ImageB imgB;
        ImageA imgA;
        private void Form1_Load(object sender, EventArgs e)
        {
            imgbase = new ImageBase();
            imgA = new ImageA();
            imgB = new ImageB();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            imgbase = imgA;
            CallFunc();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            imgbase = imgB;
            CallFunc();
        }

        public void CallFunc()
        {
            imgbase.func1();
            imgbase.func2();
        }
    }
}

ImageBase.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Windows.Forms;

namespace exe4
{
    class ImageBase
    {
        virtual public void func1()
        {
            MessageBox.Show("ImageBase->func1");
        }

        virtual public void func2()
        {
            MessageBox.Show("ImageBase->func2");
        }
    }
}

ImageA.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace exe4
{
    class ImageA:ImageBase
    {
        public override void func1()
        {
            MessageBox.Show("ImageA->func1");
        }
    }
}

ImageB.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace exe4
{
    class ImageB:ImageBase
    {
        public override void func2()
        {
            MessageBox.Show("ImageB->func2");
        }
    }
}

结果：

点击按钮A：

1.ImageA->func1

2.ImageBase->func2

点击按钮B：

1.ImageBase->func1

2.ImageB->func2