C# 类 属性 概念

类属性

初学C#，对许多概念不甚了解，就比如这个属性，做个笔记

C#中“属性”概念是类字段的访问器(getter/setter)

using System;

namespace Hello 
{
    class Shape
    {
        // 两个私有成员变量(字段)
        private int _width;
        private int _height;
        
        // 定义了width属性，其包含了对_width字段的getter和setter
        public int width
        {
            // 这里的value是默认隐含的参数
            set { this._width = value; }
            get { return this._width; }
        }
        
        public int height
        {
            set { this._height = value; }
            get { return this._height; }
        }

        public int square()
        {
            return this._width * this._height;
        }
        
        
    }
    public class Program 
    {
        public static void Main()
        {
            Shape shape = new Shape();
            
            // 此处赋值操作的10就是width属性中setter的隐含参数value
            shape.width = 10;
            shape.height = 20;
            Console.WriteLine("{0}", shape.square());
            
            shape.width = 30;
            shape.height = 40;
            Console.WriteLine("{0}", shape.square());
        }
    }
}