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;
        }
    }
}