文本框 下拉列表框 按钮 标签 控件的简单运用 计算器实例

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="caculate.aspx.cs" Inherits="caculate" %>





    


    

    

        
        
            +
            -
            *
            /
        
         
        
        

        

        
    




using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class caculate : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int a = int.Parse(this.TextBox1.Text);//获取第一个文本框的输入值并转为整形
        int b = int.Parse(this.TextBox2.Text);//获取第二个文本框的输入值并转为整形
        switch (this.DropDownList1.SelectedValue) { //以下拉列表的选择符号为判断依据
        
            case "+":
                this.Label1.Text = (a + b).ToString();//运算后转为字符串赋值给标签控件文本显示
                break;

            case "-":
                this.Label1.Text = (a - b).ToString();
                break;

            case "*":
                this.Label1.Text = (a * b).ToString();
                break;

            case "/":
                this.Label1.Text = (a / b).ToString();
                break;
        }
    }
}