小计算器(ASP.NET)

效果显示

HTML代码

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    </head>
<body>
    <form id="form1" runat="server">
    <div>
    <p>我的小计算器</p>
        <br />
        <asp:Label ID="Label1" runat="server" Text="操作数1"></asp:Label>
        <br />
        <asp:TextBox ID="txtnum1" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Label ID="Label2" runat="server" Text="运算符"></asp:Label>
        <br />
        <asp:DropDownList ID="dropclass" runat="server">
            <asp:ListItem>+</asp:ListItem>
            <asp:ListItem>-</asp:ListItem>
            <asp:ListItem>*</asp:ListItem>
            <asp:ListItem>/</asp:ListItem>
        </asp:DropDownList>
        <br />
        <br />
        <asp:Label ID="Label3" runat="server" Text="操作数2"></asp:Label>
        <br />
        <asp:TextBox ID="txtnum2" runat="server" Width="188px"></asp:TextBox>
        <br />
        <br />
        <asp:Label ID="Label4" runat="server" Text="运算结果"></asp:Label>
        <br />
        <asp:Label ID="Label15" runat="server" Text="="></asp:Label>
        <asp:TextBox ID="txtresult" runat="server"></asp:TextBox>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="计算" onclick="Button1_Click" />
        &nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button2" runat="server" Text="重置" onclick="Button2_Click" />
    </div>
    </form>
</body>
</html>

事件代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

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

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        float num1 = 0, num2 = 0, result = 0;
        num1 = float.Parse(txtnum1.Text);
        num2 = float.Parse(txtnum2.Text);
        string choice = dropclass.SelectedValue;
        switch (choice)
        {
            case "+":
                result = num1 + num2;
                break;
            case "-":
                result = num1 - num2;
                break;
            case "*":
                result = num1 * num2;
                break;
            case "/":
                result = num1 / num2;
                break;
        }
        txtresult.Text = result.ToString();
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        txtnum1.Text = "";
        txtnum2.Text = "";
        txtresult.Text = "";
    }
}

效果显示

HTML代码

事件代码

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