vs2015 dynamicweb3-16

webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="dynamicweb3_16.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    </div>
    </form>
</body>
</html>

webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace dynamicweb3_16
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        class Animal
        {
            public virtual string SayHello()
            {
                return "Animal Say Hello!";
            }
        }
        //多态
        class Dog : Animal
        {
            public override string SayHello()
            {
                return "Wang Wang!";
            }
        }
        //未使用override，错误了
        class Cat : Animal
        {
            public string SayHello()
            {
                return "Miao Miao";
            }
        }


        protected void Page_Load(object sender, EventArgs e)
        {
            Animal what = new Animal();
            Label1.Text = what.SayHello();
            what = new Dog();
            Label1.Text += "<br>" + what.SayHello();
            what = new Cat();
            Label1.Text += "<br>" + what.SayHello();

        }
    }
}

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