winform--------计算器

WinForm: 客户端应用程序； ------------------------------------------------------- 小恶作剧：

FormBorderSt----None-----无边框 TopMost----True--------最上层 ShowlnTaskbar----False----任务栏不出现 Opacity-----1%-----透明度1% WindowState----Maxinmized-----初始最大化

----------------------------------------------------------- 布局： StartPosition --开始位置 Manual --无任何位置设置，根据Location的位置开始 CenterScreen --屏幕居中显示，覆盖Location的效果 WindowsDefaultLocation --默认位置，覆盖Location的效果

Location --窗体启动时的位置

MaximumSize --最大尺寸 MinimumSize --最小尺寸 Size --窗体默认尺寸

WindowState --窗体开启时的状态 ---------------------------------------------------------- 窗口样式： ControlBox --是否有右上角最小化，最大化，关闭按钮 HelpButton --右上角是否显示帮助按钮，需要派和最大化最小化按钮显示隐藏使用 Icon --右上角小图标，ico类型的图片 IsMdiContainer --是否是MDI容器 MaximizeBox --是否显示最大化按钮 MinimizeBox --是否显示最小化按钮 Opacity --窗体透明度，最小1% ShowIcon --是否显示小图标 ShowInTaskbar --是否显示在任务栏中 SizeGripStyle --何时显示窗体拉伸手柄（鸡肋） TopMost --是否在最顶部，置顶 TransparencyKey --窗体上要透明显示的颜色 ---------------------------------------------------------- 行为： ContextMenuStrip --用户右键显示的菜单 ---------------------------------------------------------- 焦点： ---------------------------------------------------------- 可访问性： ---------------------------------------------------------- 设计： Name --窗体名称，后台调取时使用 ---------------------------------------------------------- 数据： Tag --可以放任意内容的好属性 ---------------------------------------------------------- 外观： BackColor --背景颜色 BackGroundImage --背景图片 BackGroundImage --背景图片排列格式 Cursor --鼠标进入该控件的样式 Font --字体样式 ForeColor --字体颜色 FormBorderStyle --窗体边框样式，有无边框，是否可以拉伸等效果 Text --窗体右上角名称 ---------------------------------------------------------- 杂项： AcceptButton --设置一个按钮，用户在当前窗体按回车就相当于按了这个按钮 CancelButton --设置一个按钮，用户在当前窗体按ESC就相当于按了这个按钮

计算器：

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 _6._26
{
    public partial class 计算 : Form
    {
        public 计算()
        {
            InitializeComponent();
        }

        private void b0_Click(object sender, EventArgs e)
        {
             textBox2.Text +="0";
        }

        private void b1_Click(object sender, EventArgs e)
        {
            textBox2.Text += "1";
        }

        private void b2_Click(object sender, EventArgs e)
        {
            textBox2.Text += "2";
        }

        private void b3_Click(object sender, EventArgs e)
        {
            textBox2.Text += "3";
        }

        private void b4_Click(object sender, EventArgs e)
        {
            textBox2.Text += "4";
        }

        private void b5_Click(object sender, EventArgs e)
        {
            textBox2.Text += "5";
        }

        private void b6_Click(object sender, EventArgs e)
        {
            textBox2.Text += "6";
        }

        private void b7_Click(object sender, EventArgs e)
        {
            textBox2.Text += "7";
        }

        private void b8_Click(object sender, EventArgs e)
        {
            textBox2.Text += "8";
        }

        private void b9_Click(object sender, EventArgs e)
        {
            textBox2.Text += "9";
        }

        private void bdian_Click(object sender, EventArgs e)
        {
            textBox2.Text += ".";
        }

        double a, b,c;    //a---1;b---2   第一个数a;第二个数b
        string m;    //运算符

        //-------------------------------------------------
        private void bjia_Click(object sender, EventArgs e)//+
        {

            if (textBox1.Text == "")       -----textBox1为空时
            {
                a = Convert.ToDouble(textBox2.Text);  //a是+前的数字
                m = "+";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
            else    ------textBox1不为空时
            {

                //执行！！！！！
                c = Convert.ToDouble(textBox2.Text);  //textBox2的数字
               
                switch (m)                     
                {
                    case ("+"):
                        textBox2.Text = Convert.ToString(a + c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("-"):
                        textBox2.Text = Convert.ToString(a - c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("*"):
                        textBox2.Text = Convert.ToString(a * c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("/"):
                        textBox2.Text = Convert.ToString(a / c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                } 
                m = "+";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }

        }

        private void jian_Click(object sender, EventArgs e)//-
        {
            if (textBox1.Text == "")
            {
                a = Convert.ToDouble(textBox2.Text);  //a是-前的数字
                m = "-";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
            else
            {

                //执行！！！！！
                c = Convert.ToDouble(textBox2.Text);  //textBox2的数字

                switch (m)
                {
                    case ("+"):
                        textBox2.Text = Convert.ToString(a + c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("-"):
                        textBox2.Text = Convert.ToString(a - c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("*"):
                        textBox2.Text = Convert.ToString(a * c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("/"):
                        textBox2.Text = Convert.ToString(a / c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                }
                m = "-";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
        }

        private void cheng_Click(object sender, EventArgs e) //*
        {
            if (textBox1.Text == "")
            {
                a = Convert.ToDouble(textBox2.Text);  //a是*前的数字
                m = "*";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
            else
            {

                //执行！！！！！
                c = Convert.ToDouble(textBox2.Text);  //textBox2的数字

                switch (m)
                {
                    case ("+"):
                        textBox2.Text = Convert.ToString(a + c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("-"):
                        textBox2.Text = Convert.ToString(a - c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("*"):
                        textBox2.Text = Convert.ToString(a * c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("/"):
                        textBox2.Text = Convert.ToString(a / c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                }
                m = "*";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
        }

        private void chu_Click(object sender, EventArgs e) //  /
        {
            if (textBox1.Text == "")
            {
                a = Convert.ToDouble(textBox2.Text);  //a是/前的数字
                m = "/";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
            else
            {

                //执行！！！！！
                c = Convert.ToDouble(textBox2.Text);  //textBox2的数字

                switch (m)
                {
                    case ("+"):
                        textBox2.Text = Convert.ToString(a + c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("-"):
                        textBox2.Text = Convert.ToString(a - c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("*"):
                        textBox2.Text = Convert.ToString(a * c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                    case ("/"):
                        textBox2.Text = Convert.ToString(a / c);
                        a = Convert.ToDouble(textBox2.Text);
                        break;
                }
                m = "/";         //m是运算符
                textBox1.Text = textBox2.Text + m;  //textBox1.Text中显示
                textBox2.Text = "";   //textBox2清空
            }
        }

        private void deng_Click(object sender, EventArgs e) // =
        {
              //执行！！！！！
            b = Convert.ToDouble(textBox2.Text);  //d是=前的数字
            switch (m)
            {
                case ("+"):    ---加法时执行加法
                    textBox2.Text = Convert.ToString(a + b);
                textBox1.Text = "";    ---清空textBox1
                    break;
                case ("-"):
                    textBox2.Text = Convert.ToString(a - b);
                  textBox1.Text = "";
                    break;
                case ("*"):
                    textBox2.Text = Convert.ToString(a * b);
                    
                     textBox1.Text = "";
                    break;
                case ("/"):
                    textBox2.Text = Convert.ToString(a / b);
                      textBox1.Text = "";
                    break;
            }
        }

        private void C_Click(object sender, EventArgs e)
        {
            textBox2.Text = "";
            textBox1.Text = "";
        }

        private void Da_Click(object sender, EventArgs e)
        {
              //删除追后一个数字
              string q=textBox2.Text;
              q = q.Substring(0, q.Length - 1); //Substring 截取字符串长度 ，Length 截取当前字符串长度
              textBox2.Text = q;
        }
    }
}