简易计算器WinForm方式

在博客园上看到的，忘记路径了

效果图：

Form1.cs

namespace 简易计算器

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private string FuHao;  //定义操作符号（+，-，*，/）

        private string num1;   //定义第一个参数（就是参与运算的第一个数）

        private string num2;   //定义第二个参数

        private string oldValue = "0";   //定义老参数



        private void btn_Clean_Click(object sender, EventArgs e)

        {

            txt_Vlaue.Text = "0";

            FuHao = string.Empty;

            oldValue = "0";

        }



        private void btn_GetVlaue_Click(object sender, EventArgs e)

        {

            if (FuHao == string.Empty)

            {

                txt_Vlaue.Text = num1.ToString();

            }

            else

            {

                GetValue();

            }

        }





      



        private void btn_add_Click(object sender, EventArgs e)

        {

            if (num2 != null && num2 != string.Empty)

            {

                GetValue();

            }

            FuHao = "+";

            oldValue = "0";

        }



        private void btn_Jian_Click(object sender, EventArgs e)

        {

            if (num2 != null && num2 != string.Empty)

            {

                GetValue();

            }

            FuHao = "-";

            oldValue = "0";

        }



        private void btn_Cheng_Click(object sender, EventArgs e)

        {

            if (num2 != null && num2 != string.Empty)

            {

                GetValue();

            }

            FuHao = "*";

            oldValue = "0";

        }



        private void btn_Chu_Click(object sender, EventArgs e)

        {

            if (num2 != null && num2 != string.Empty)

            {

                GetValue();

            }

            FuHao = "/";

            oldValue = "0";

        }



        private void btn_0_Click(object sender, EventArgs e)

        {

            InputName("0");

        }

      



        private void btn_1_Click(object sender, EventArgs e)

        {

            InputName("1");

        }



        private void btn_2_Click(object sender, EventArgs e)

        {

            InputName("2");

        }



        private void btn_3_Click(object sender, EventArgs e)

        {

            InputName("3");

        }



        private void btn_4_Click(object sender, EventArgs e)

        {

            InputName("4");

        }



        private void btn_5_Click(object sender, EventArgs e)

        {

            InputName("5");

        }



        private void btn_6_Click(object sender, EventArgs e)

        {

            InputName("6");

        }



        private void bvtn_7_Click(object sender, EventArgs e)

        {

            InputName("7");

        }



        private void btn_8_Click(object sender, EventArgs e)

        {

            InputName("8");

        }



        private void btn_9_Click(object sender, EventArgs e)

        {

            InputName("9");

        }



        public void InputName(string value)

        {

            if (oldValue != "0")

            {

                txt_Vlaue.Text = oldValue + value;

            }

            else

            {

                if (value == ".")

                {

                    txt_Vlaue.Text = "0" + value;

                }

                else

                {

                    txt_Vlaue.Text = value;

                }

            }

            oldValue = txt_Vlaue.Text;



            if (FuHao != null && FuHao.ToString().Trim() != string.Empty)

            {

                num2 = txt_Vlaue.Text;

            }

            else

            {

                num1 = txt_Vlaue.Text;

            }

        }





        private void GetValue()

        {

            double numa = double.Parse(num1);

            double numb = double.Parse(num2);

            double result = 0;

            switch (FuHao)

            {

                case "+":

                    result = numa + numb;

                    break;

                case "-":

                    result = numa - numb;

                    break;

                case "*":

                    result = numa * numb;

                    break;

                default:

                    result = numa / numb;

                    break;

            }

            txt_Vlaue.Text = result.ToString();

            FuHao = string.Empty;

            oldValue = "0";

            num1 = txt_Vlaue.Text;

            num2 = string.Empty;

        }

    }

}