窗体应用程序计算长方体的面积体积

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题主要的代码如下，有帮助麻烦点个采纳【本回答右上角】，谢谢~~有其他问题可以继续交流~，如需工程文件可以站内发邮箱。

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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 长方体
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double length = double.Parse(txtLength.Text);
            double width = double.Parse(txtWidth.Text);
            double height = double.Parse(txtHeight.Text);
            lbResult.Text = new Cuboid {Length=length,Width=width,Height=height }.ToString();
        }
    }
    class Cuboid
    {
        public double Length { get; set; }
        public double Width { get; set; }
        public double Height { get; set; }
        public double Volume()
        {
            return Length * Width * Height;
        }
        public double Area()
        {
            return (Length * Width + Length * Height + Width * Height) * 2;
        }
        public new string ToString()
        {
            return string.Format("表面积是{0}，体积是{1}",this.Area(),this.Volume());
        }
    }
}

窗体样式都贴图给你了，
加减乘除法应该会吧？
大学好好读书。

 class Cuboid
    {
        public Cuboid()
        {

        }

        double _length = 10;
        public double Length
        {
            get { return _length; }
            set
            {
                if (value < 0)
                    value = 0;
                _length = value;
            }
        }
        double _width = 5;
        public double Width
        {
            get { return _width; }
            set
            {
                if (value < 0)
                    value = 0;
                _width = value;
            }
        }

        double _height = 5;
        public double Height
        {
            get { return _height; }
            set
            {
                if (value < 0)
                    value = 0;
                _height = value;
            }
        }

        public double  GetArea()
        {
            return 2 * (_length * _width + _width * _height + _height * _length);
        }
        public double GetVolume()
        {
            return _length * _width * _height;
        }

    }

使用 ：
Cuboid cuboid = new Cuboid() { Length = 20, Width = 10, Height = 5 };
double ar = cuboid.GetArea();
double vo = cuboid.GetVolume();

float length =float.Parse(this.textBox1.Text.ToString());
float width = float.Parse(this.textBox2.Text.ToString());
float height = float.Parse(this.textBox3.Text.ToString());
float biaomianji = 2 * length * width + 2 * length * height + 2 * width * height;
float tiji = length * width * height;
string s = biaomianji.ToString() + " " + tiji.ToString();
this.textBox4.Text = s;

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