抽象类和抽象方法：Abstract and override,Event ,Indexer

最新推荐文章于 2025-01-07 11:47:35 发布

原创最新推荐文章于 2025-01-07 11:47:35 发布 · 467 阅读

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CC 4.0 BY-SA版权

文章标签：

#string #class #function #object #null

本文通过一个具体的 C# 示例介绍了基类(BaseClass)与派生类(DeriveClass)之间的继承关系，展示了属性、方法及事件的重写过程，并提供了一个简单的测试程序验证派生类的功能。

//Test Class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CSharpTest
{

    public abstract class BaseClass
    {
        public abstract String Attribute
        {
            get;
            set;
        }

        public abstract void Function(String value);
        public abstract event EventHandler Event;
        public abstract Char this[int Index]
        {
            get;
        }

}

    public class DeriveClass : BaseClass
    {
        private String attribute;

        public override String Attribute
        {
            get
            {
                return attribute;
            }
            set
            {
                attribute = value;
            }
        }
        public override void Function(String value)
        {
            attribute = value;
            if (Event != null)
            {
                Event(this, new EventArgs());
            }
        }
        public override event EventHandler Event;
        public override Char this[int Index]
        {
            get
            {
                return attribute[Index];
            }
        }
    }

}

//Display Result

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using CSharpTest;

namespace CSharpExam
{
    class Program
    {
        static void OnFunction(object sender, EventArgs e)
        {
            for (int i = 0; i < ((DeriveClass)sender).Attribute.Length; i++)
            {
                Console.WriteLine(((DeriveClass)sender)[i]);
            }
        }

        static void Main(string[] args)
        {

            DeriveClass tmpObj = new DeriveClass();

            tmpObj.Attribute = "1234567";
            Console.WriteLine(tmpObj.Attribute);

tmpObj.Event += new EventHandler(OnFunction);

            tmpObj.Function("7654321");

            Console.ReadKey();
        }
    }
}