文章目录
- 一、简单计算器
- 二、复杂计算器
一、简单计算器
新建Web应用项目，窗体页面
窗体设计代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="AdoDemo.Default" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title>简单计算器</title>
</head>
<body><form id="form1" runat="server"><div><asp:TextBox ID="txtNum1" runat="server" Width="100px"></asp:TextBox><asp:TextBox ID="txtNum2" runat="server" Width="100px"></asp:TextBox><br /><asp:DropDownList ID="ddlOperation" runat="server"><asp:ListItem Text="+" Value="Addition"></asp:ListItem><asp:ListItem Text="-" Value="Subtraction"></asp:ListItem><asp:ListItem Text="*" Value="Multiplication"></asp:ListItem><asp:ListItem Text="/" Value="Division"></asp:ListItem></asp:DropDownList><asp:Button ID="btnCalculate" runat="server" Text="计算" OnClick="btnCalculate_Click"/><br /><asp:Label ID="lbResult" runat="server" Text=""></asp:Label></div></form>
</body>
</html>后台代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;namespace AdoDemo
{public partial class Default : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){}protected void btnCalculate_Click(object sender, EventArgs e){double num1, num2;if (double.TryParse(txtNum1.Text, out num1) && double.TryParse(txtNum2.Text, out num2)){switch (ddlOperation.SelectedValue){case "Addition":lbResult.Text = (num1 + num2).ToString();break;case "Subtraction":lbResult.Text = (num1 - num2).ToString();break;case "Multiplication":lbResult.Text = (num1 * num2).ToString();break;case "Division":lbResult.Text = (num1 / num2).ToString();break;}}else{lbResult.Text = "请输入有效数字！";}}}
}运行结果：
二、复杂计算器
创建项目：
窗体设计代码（查看设计器/查看标记进行设计模式和设计代码模式切换）：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="AdoDemo.Default" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title>复杂计算器</title><style>body {font-family: Arial, sans-serif;background-color: #f0f0f0;display: flex;justify-content: center;align-items: center;height: 100vh;margin: 0;}.calculator {background-color: #fff;border-radius: 10px;box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);padding: 20px;width: 300px;}.display {background-color: #222;color: #fff;font-size: 2em;padding: 10px;text-align: right;border-radius: 5px;margin-bottom: 10px;}.buttons {display: grid;grid-template-columns: repeat(4, 1fr);gap: 10px;}.button {background-color: #f0f0f0;border: none;border-radius: 5px;font-size: 1.5em;padding: 20px;cursor: pointer;transition: background-color 0.3s;}.button:hover {background-color: #ddd;}.button.operator {background-color: #ff9500;color: #fff;}.button.operator:hover {background-color: #e08900;}</style>
</head>
<body><form id="form1" runat="server"><div class="calculator"><asp:TextBox ID="txtDisplay" runat="server" CssClass="display" ReadOnly="true" Width="292px"></asp:TextBox><div class="buttons"><asp:Button ID="btnClear" runat="server" Text="C" CssClass="button" OnClick="btnClear_Click" /><asp:Button ID="btnBackspace" runat="server" Text="←" CssClass="button" OnClick="btnBackspace_Click" /><asp:Button ID="btnPercent" runat="server" Text="%" CssClass="button" OnClick="btnPercent_Click" /><asp:Button ID="btnDivide" runat="server" Text="÷" CssClass="button operator" OnClick="btnOperator_Click" /><asp:Button ID="btn7" runat="server" Text="7" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btn8" runat="server" Text="8" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btn9" runat="server" Text="9" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btnMultiply" runat="server" Text="×" CssClass="button operator" OnClick="btnOperator_Click" /><asp:Button ID="btn4" runat="server" Text="4" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btn5" runat="server" Text="5" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btn6" runat="server" Text="6" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btnSubtract" runat="server" Text="-" CssClass="button operator" OnClick="btnOperator_Click" /><asp:Button ID="btn1" runat="server" Text="1" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btn2" runat="server" Text="2" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btn3" runat="server" Text="3" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btnAdd" runat="server" Text="+" CssClass="button operator" OnClick="btnOperator_Click" /><asp:Button ID="btn0" runat="server" Text="0" CssClass="button" OnClick="btnNumber_Click" /><asp:Button ID="btnDecimal" runat="server" Text="." CssClass="button" OnClick="btnDecimal_Click" /><asp:Button ID="btnEquals" runat="server" Text="=" CssClass="button operator" OnClick="btnEquals_Click" /></div></div></form>
</body>
</html>后台代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;namespace AdoDemo
{public partial class Default : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){ViewState["CurrentValue"] = "0";ViewState["Operator"] = string.Empty;ViewState["FirstOperand"] = string.Empty;}}protected void btnNumber_Click(object sender, EventArgs e){string number = ((Button)sender).Text;if (ViewState["CurrentValue"].ToString() == "0"){ViewState["CurrentValue"] = number;}else{ViewState["CurrentValue"] += number;}txtDisplay.Text = ViewState["CurrentValue"].ToString();}protected void btnOperator_Click(object sender, EventArgs e){ViewState["FirstOperand"] = ViewState["CurrentValue"];ViewState["Operator"] = ((Button)sender).Text;ViewState["CurrentValue"] = "0";}protected void btnEquals_Click(object sender, EventArgs e){double firstOperand = Convert.ToDouble(ViewState["FirstOperand"]);double secondOperand = Convert.ToDouble(ViewState["CurrentValue"]);string operatorSymbol = ViewState["Operator"].ToString();double result = 0;switch (operatorSymbol){case "+":result = firstOperand + secondOperand;break;case "-":result = firstOperand - secondOperand;break;case "×":result = firstOperand * secondOperand;break;case "÷":result = firstOperand / secondOperand;break;}ViewState["CurrentValue"] = result.ToString();txtDisplay.Text = result.ToString();}protected void btnClear_Click(object sender, EventArgs e){ViewState["CurrentValue"] = "0";ViewState["Operator"] = string.Empty;ViewState["FirstOperand"] = string.Empty;txtDisplay.Text = "0";}protected void btnBackspace_Click(object sender, EventArgs e){string currentValue = ViewState["CurrentValue"].ToString();if (currentValue.Length > 1){ViewState["CurrentValue"] = currentValue.Substring(0, currentValue.Length - 1);}else{ViewState["CurrentValue"] = "0";}txtDisplay.Text = ViewState["CurrentValue"].ToString();}protected void btnPercent_Click(object sender, EventArgs e){double currentValue = Convert.ToDouble(ViewState["CurrentValue"]);ViewState["CurrentValue"] = (currentValue / 100).ToString();txtDisplay.Text = ViewState["CurrentValue"].ToString();}protected void btnDecimal_Click(object sender, EventArgs e){if (!ViewState["CurrentValue"].ToString().Contains(".")){ViewState["CurrentValue"] += ".";}txtDisplay.Text = ViewState["CurrentValue"].ToString();}}
}运行结果：
