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   源码介绍

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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.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void bt_add_Click(object sender, EventArgs e)
        {
            Double s1 = 0, s2 = 0,result = 0;
            if (tb1.Text !="") 
            {
                try
                {
                    s1 = Convert.ToDouble(tb1.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            if (tb2.Text != "") 
            {
                try
                {
                    s2 = Convert.ToDouble(tb2.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            result = s1   s2;
            tb_result.Text = result.ToString();
         
        }

        private void bt_subtract_Click(object sender, EventArgs e)
        {
            Double s1 = 0, s2 = 0, result = 0;
            if (tb1.Text != "")
            {
                try
                {
                    s1 = Convert.ToDouble(tb1.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            if (tb2.Text != "")
            {
                try
                {
                    s2 = Convert.ToDouble(tb2.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            result = s1 - s2;
            tb_result.Text = result.ToString();
         
        }

        private void bt_multiply_Click(object sender, EventArgs e)
        {
            Double s1 = 0, s2 = 0, result = 0;
            if (tb1.Text != "")
            {
                try
                {
                    s1 = Convert.ToDouble(tb1.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            if (tb2.Text != "")
            {
                try
                {
                    s2 = Convert.ToDouble(tb2.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            result = s1 * s2;
            tb_result.Text = result.ToString();
         
        }

        private void bt_divide_Click(object sender, EventArgs e)
        {
            Double s1 = 0, s2 = 0, result = 0;
            if (tb1.Text != "")
            {
                try
                {
                    s1 = Convert.ToDouble(tb1.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            if (tb2.Text != "")
            {
                try
                {
                    s2 = Convert.ToDouble(tb2.Text.ToString().Trim());
                }
                catch { MessageBox.Show("请输入正确的数字！", "提示"); return; }
            }
            if (s2 == 0.0) { MessageBox.Show("被除数不能为0！", "提示"); return; }
            result = s1 / s2;
            tb_result.Text = result.ToString();
         
        }
    }
}