C#怎么实现计算器四则运算

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初始化，实现四则运算

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 WindowsFormsAppCalculator{    public partial class Form1 : Form    {        double number1 = 0;        double number2 = 0;        double result;        int inputNumber;        enum Operator { none, plus, minus, multiplication, division}//判断运算法则        Operator mode = Operator.none;        bool isequal = false;        public Form1()        {            InitializeComponent();        }        private void num1_Click(object sender, EventArgs e)        {            inputNumber = 1;            WindowsFormsAppCalculator(inputNumber);            //number1 = number1 * 10 + 1;            //labelout.Text = Convert.ToString(number1);                  }        private void num2_Click(object sender, EventArgs e)        {            inputNumber = 2;            WindowsFormsAppCalculator(inputNumber);        }        private void num3_Click(object sender, EventArgs e)        {            inputNumber = 3;            WindowsFormsAppCalculator(inputNumber);        }        private void num4_Click(object sender, EventArgs e)        {            inputNumber = 4;            WindowsFormsAppCalculator(inputNumber);        }        private void num5_Click(object sender, EventArgs e)        {            inputNumber = 5;            WindowsFormsAppCalculator(inputNumber);        }        private void num6_Click(object sender, EventArgs e)        {            inputNumber = 6;            WindowsFormsAppCalculator(inputNumber);        }        private void num7_Click(object sender, EventArgs e)        {            inputNumber = 7;            WindowsFormsAppCalculator(inputNumber);        }        private void num8_Click(object sender, EventArgs e)        {            inputNumber = 8;            WindowsFormsAppCalculator(inputNumber);        }        private void num9_Click(object sender, EventArgs e)        {            inputNumber = 9;            WindowsFormsAppCalculator(inputNumber);        }        private void num0_Click(object sender, EventArgs e)        {            inputNumber = 0;            WindowsFormsAppCalculator(inputNumber);        }        private void Form1_Load(object sender, EventArgs e)        {            labelout.Text = Convert.ToString(number1);        }        private void clean_Click(object sender, EventArgs e)        {            cleanAll();        }        public void WindowsFormsAppCalculator(int an) //不懂这段怎么来的        {            if (mode == Operator.none)            {                number1 = number1 * 10 + an;                labelout.Text = Convert.ToString(number1);            }            else            {                number2 = number2 * 10 + an;                labelout.Text = Convert.ToString(number2);            }        }        private void plus_Click(object sender, EventArgs e)        {            mode = Operator.plus;            switchmode();            //isequal = true;         }        private void minus_Click(object sender, EventArgs e)        {            mode = Operator.minus;            switchmode();        }        private void multiplication_Click(object sender, EventArgs e)        {            mode = Operator.multiplication;            switchmode();        }        private void division_Click(object sender, EventArgs e)        {            mode = Operator.division;            switchmode();        }        private void equal_Click(object sender, EventArgs e)        {            switch (mode)            {                case Operator.plus:                     result = number1 + number2;                    break;                case Operator.minus:                     result = number1 - number2;                    break;                case Operator.multiplication:                     result = number1 * number2;                    break;                case Operator.division:                     result = number1 / number2;                    break;            }                        isequal = true;            labelbefore.Text = "";            labelmode.Text = "";            labelout.Text = Convert.ToString(result);                    }        public void cleanAll()        {            number1 = 0;            number2 = 0;            labelout.Text = Convert.ToString(number1);            labelbefore.Text = "";            labelmode.Text = "";            isequal = false;            mode = Operator.none;        }        public void switchmode()        {            switch (mode)            {                case Operator.plus:                    labelmode.Text = "+";                    break;                case Operator.minus:                    labelmode.Text = "-";                    break;                case Operator.multiplication:                    labelmode.Text = "*";                    break;                case Operator.division:                    labelmode.Text = "/";                    break;            }            //isequal = true;            //cleanAll();                       labelbefore.Text = Convert.ToString(number1);            labelout.Text = Convert.ToString(number2);        }    }}

namespace WindowsFormsAppCalculator{    partial class Form1    {        /// 
        /// 必需的设计器变量。        /// 
        private System.ComponentModel.IContainer components = null;        /// 
        /// 清理所有正在使用的资源。        /// 
        /// 如果应释放托管资源，为 true；否则为 false。        protected override void Dispose(bool disposing)        {            if (disposing && (components != null))            {                components.Dispose();            }            base.Dispose(disposing);        }        #region Windows 窗体设计器生成的代码        /// 
        /// 设计器支持所需的方法 - 不要修改        /// 使用代码编辑器修改此方法的内容。        /// 
        private void InitializeComponent()        {            this.labelout = new System.Windows.Forms.Label();            this.labelbefore = new System.Windows.Forms.Label();            this.labelmode = new System.Windows.Forms.Label();            this.num1 = new System.Windows.Forms.Button();            this.num6 = new System.Windows.Forms.Button();            this.num8 = new System.Windows.Forms.Button();            this.num7 = new System.Windows.Forms.Button();            this.num5 = new System.Windows.Forms.Button();            this.num4 = new System.Windows.Forms.Button();            this.num9 = new System.Windows.Forms.Button();            this.num2 = new System.Windows.Forms.Button();            this.num3 = new System.Windows.Forms.Button();            this.num0 = new System.Windows.Forms.Button();            this.clean = new System.Windows.Forms.Button();            this.minus = new System.Windows.Forms.Button();            this.multiplication = new System.Windows.Forms.Button();            this.division = new System.Windows.Forms.Button();            this.plus = new System.Windows.Forms.Button();            this.equal = new System.Windows.Forms.Button();            this.SuspendLayout();            //             // labelout            //             this.labelout.Font = new System.Drawing.Font("宋体", 25.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));            this.labelout.Location = new System.Drawing.Point(26, 111);            this.labelout.Name = "labelout";            this.labelout.Size = new System.Drawing.Size(463, 49);            this.labelout.TabIndex = 0;            this.labelout.TextAlign = System.Drawing.ContentAlignment.BottomRight;            //             // labelbefore            //             this.labelbefore.Font = new System.Drawing.Font("宋体", 22.2F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));            this.labelbefore.Location = new System.Drawing.Point(27, 9);            this.labelbefore.Name = "labelbefore";            this.labelbefore.Size = new System.Drawing.Size(463, 43);            this.labelbefore.TabIndex = 1;            this.labelbefore.TextAlign = System.Drawing.ContentAlignment.BottomRight;            //             // labelmode            //             this.labelmode.Font = new System.Drawing.Font("宋体", 22.2F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));            this.labelmode.Location = new System.Drawing.Point(28, 61);            this.labelmode.Name = "labelmode";            this.labelmode.Size = new System.Drawing.Size(463, 39);            this.labelmode.TabIndex = 2;            this.labelmode.TextAlign = System.Drawing.ContentAlignment.BottomRight;            //             // num1            //             this.num1.Location = new System.Drawing.Point(35, 199);            this.num1.Name = "num1";            this.num1.Size = new System.Drawing.Size(71, 41);            this.num1.TabIndex = 3;            this.num1.Text = "1";            this.num1.UseVisualStyleBackColor = true;            this.num1.Click += new System.EventHandler(this.num1_Click);            //             // num6            //             this.num6.Location = new System.Drawing.Point(218, 253);            this.num6.Name = "num6";            this.num6.Size = new System.Drawing.Size(71, 41);            this.num6.TabIndex = 6;            this.num6.Text = "6";            this.num6.UseVisualStyleBackColor = true;            this.num6.Click += new System.EventHandler(this.num6_Click);            //             // num8            //             this.num8.Location = new System.Drawing.Point(130, 312);            this.num8.Name = "num8";            this.num8.Size = new System.Drawing.Size(71, 41);            this.num8.TabIndex = 7;            this.num8.Text = "8";            this.num8.UseVisualStyleBackColor = true;            this.num8.Click += new System.EventHandler(this.num8_Click);            //             // num7            //             this.num7.Location = new System.Drawing.Point(35, 312);            this.num7.Name = "num7";            this.num7.Size = new System.Drawing.Size(71, 41);            this.num7.TabIndex = 8;            this.num7.Text = "7";            this.num7.UseVisualStyleBackColor = true;            this.num7.Click += new System.EventHandler(this.num7_Click);            //             // num5            //             this.num5.Location = new System.Drawing.Point(130, 253);            this.num5.Name = "num5";            this.num5.Size = new System.Drawing.Size(71, 41);            this.num5.TabIndex = 9;            this.num5.Text = "5";            this.num5.UseVisualStyleBackColor = true;            this.num5.Click += new System.EventHandler(this.num5_Click);            //             // num4            //             this.num4.Location = new System.Drawing.Point(35, 253);            this.num4.Name = "num4";            this.num4.Size = new System.Drawing.Size(71, 41);            this.num4.TabIndex = 10;            this.num4.Text = "4";            this.num4.UseVisualStyleBackColor = true;            this.num4.Click += new System.EventHandler(this.num4_Click);            //             // num9            //             this.num9.Location = new System.Drawing.Point(218, 312);            this.num9.Name = "num9";            this.num9.Size = new System.Drawing.Size(71, 41);            this.num9.TabIndex = 11;            this.num9.Text = "9";            this.num9.UseVisualStyleBackColor = true;            this.num9.Click += new System.EventHandler(this.num9_Click);            //             // num2            //             this.num2.Location = new System.Drawing.Point(130, 199);            this.num2.Name = "num2";            this.num2.Size = new System.Drawing.Size(71, 41);            this.num2.TabIndex = 12;            this.num2.Text = "2";            this.num2.UseVisualStyleBackColor = true;            this.num2.Click += new System.EventHandler(this.num2_Click);            //             // num3            //             this.num3.Location = new System.Drawing.Point(218, 199);            this.num3.Name = "num3";            this.num3.Size = new System.Drawing.Size(71, 41);            this.num3.TabIndex = 13;            this.num3.Text = "3";            this.num3.UseVisualStyleBackColor = true;            this.num3.Click += new System.EventHandler(this.num3_Click);            //             // num0            //             this.num0.Location = new System.Drawing.Point(130, 372);            this.num0.Name = "num0";            this.num0.Size = new System.Drawing.Size(71, 41);            this.num0.TabIndex = 14;            this.num0.Text = "0";            this.num0.UseVisualStyleBackColor = true;            this.num0.Click += new System.EventHandler(this.num0_Click);            //             // clean            //             this.clean.Location = new System.Drawing.Point(387, 199);            this.clean.Name = "clean";            this.clean.Size = new System.Drawing.Size(71, 41);            this.clean.TabIndex = 15;            this.clean.Text = "清除";            this.clean.UseVisualStyleBackColor = true;            this.clean.Click += new System.EventHandler(this.clean_Click);            //             // minus            //             this.minus.Location = new System.Drawing.Point(305, 253);            this.minus.Name = "minus";            this.minus.Size = new System.Drawing.Size(71, 41);            this.minus.TabIndex = 16;            this.minus.Text = "-";            this.minus.UseVisualStyleBackColor = true;            this.minus.Click += new System.EventHandler(this.minus_Click);            //             // multiplication            //             this.multiplication.Location = new System.Drawing.Point(305, 312);            this.multiplication.Name = "multiplication";            this.multiplication.Size = new System.Drawing.Size(71, 41);            this.multiplication.TabIndex = 17;            this.multiplication.Text = "*";            this.multiplication.UseVisualStyleBackColor = true;            this.multiplication.Click += new System.EventHandler(this.multiplication_Click);            //             // division            //             this.division.Location = new System.Drawing.Point(305, 372);            this.division.Name = "division";            this.division.Size = new System.Drawing.Size(71, 41);            this.division.TabIndex = 18;            this.division.Text = "/";            this.division.UseVisualStyleBackColor = true;            this.division.Click += new System.EventHandler(this.division_Click);            //             // plus            //             this.plus.Location = new System.Drawing.Point(305, 199);            this.plus.Name = "plus";            this.plus.Size = new System.Drawing.Size(71, 41);            this.plus.TabIndex = 19;            this.plus.Text = "+";            this.plus.UseVisualStyleBackColor = true;            this.plus.Click += new System.EventHandler(this.plus_Click);            //             // equal            //             this.equal.Location = new System.Drawing.Point(218, 372);            this.equal.Name = "equal";            this.equal.Size = new System.Drawing.Size(71, 41);            this.equal.TabIndex = 20;            this.equal.Text = "=";            this.equal.UseVisualStyleBackColor = true;            this.equal.Click += new System.EventHandler(this.equal_Click);            //             // Form1            //             this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;            this.ClientSize = new System.Drawing.Size(502, 466);            this.Controls.Add(this.equal);            this.Controls.Add(this.plus);            this.Controls.Add(this.division);            this.Controls.Add(this.multiplication);            this.Controls.Add(this.minus);            this.Controls.Add(this.clean);            this.Controls.Add(this.num0);            this.Controls.Add(this.num3);            this.Controls.Add(this.num2);            this.Controls.Add(this.num9);            this.Controls.Add(this.num4);            this.Controls.Add(this.num5);            this.Controls.Add(this.num7);            this.Controls.Add(this.num8);            this.Controls.Add(this.num6);            this.Controls.Add(this.num1);            this.Controls.Add(this.labelmode);            this.Controls.Add(this.labelbefore);            this.Controls.Add(this.labelout);            this.Name = "Form1";            this.Text = "Form1";            this.Load += new System.EventHandler(this.Form1_Load);            this.ResumeLayout(false);        }        #endregion        private System.Windows.Forms.Label labelout;        private System.Windows.Forms.Label labelbefore;        private System.Windows.Forms.Label labelmode;        private System.Windows.Forms.Button num1;        private System.Windows.Forms.Button num6;        private System.Windows.Forms.Button num8;        private System.Windows.Forms.Button num7;        private System.Windows.Forms.Button num5;        private System.Windows.Forms.Button num4;        private System.Windows.Forms.Button num9;        private System.Windows.Forms.Button num2;        private System.Windows.Forms.Button num3;        private System.Windows.Forms.Button num0;        private System.Windows.Forms.Button clean;        private System.Windows.Forms.Button minus;        private System.Windows.Forms.Button multiplication;        private System.Windows.Forms.Button division;        private System.Windows.Forms.Button plus;        private System.Windows.Forms.Button equal;    }}

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