ASP.NET实验Calculator Drop down list

实现一个简易计算器

Calculator.aspx文件

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Calculator.aspx.cs" Inherits="Ex4_Calculator" %>

<!DOCTYPE html>

</head>

<body>

<asp:TextBox ID="txtDisplay" runat="server" Width="110px" ReadOnly="True"></asp:TextBox><br />

<asp:Button ID="btnOne" runat="server" Text="1" Width="40px" Onclick="btnOne_Click"/>

<asp:Button ID="btnTwo" runat="server" Text="2" Width="40px" Onclick="btnTwo_Click"/>

<asp:Button ID="btnThree" runat="server" Text="3" Width="40px" Onclick="btnThree_Click"/><br />

<asp:Button ID="btnAdd" runat="server" Text="+" Width="40px" Onclick="btnAdd_Click"/>

<asp:Button ID="btnSubtract" runat="server" Text="-" Width="40px" Onclick="btnSubtract_Click" />

<asp:Button ID="btnEqual" runat="server" Text="=" Width="40px" Onclick="btnEqual_Click"/>

</div>

</form>

</body>

</html>

Calculator.aspx.cs文件

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class Ex4_Calculator : System.Web.UI.Page

{

static string num1 = "0", num2 = "0", total = "", sign = "";

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Count()

{

num2 = txtDisplay.Text;

if (num2 == "")

{

num2 = "0";

}

switch(sign)

{

case "+":

txtDisplay.Text = (int.Parse(num1) + int.Parse(num2).ToString() );

num1 = "0";

num2 = "0";

total = "";

sign = "";

break;

case "-":

txtDisplay.Text = (int.Parse(num1) - int.Parse(num2)).ToString();

num1 = "0";

num2 = "0";

total = "";

sign = "";

break;

}

protected void btnOne_Click(object sender, EventArgs e)

{

total += "1";

txtDisplay.Text = total;

}

protected void btnTwo_Click(object sender, EventArgs e)

{

total += "2";

txtDisplay.Text = total;

}

protected void btnThree_Click(object sender, EventArgs e)

{

total += "3";

txtDisplay.Text = total;

}

protected void btnAdd_Click(object sender, EventArgs e)

{

if (sign.Length == 1)

{

Count();

num1 = txtDisplay.Text;

sign = "+";

}

else

{

num1 = txtDisplay.Text;

txtDisplay.Text = "";

total = "";

sign = "+";

}

protected void btnSubtract_Click(object sender, EventArgs e)

{

if (sign.Length == 1)

{

Count();

num1 = txtDisplay.Text;

sign = "-";

}

else

{

num1 = txtDisplay.Text;

txtDisplay.Text = "";

total = "";

sign = "-";

}

protected void btnEqual_Click(object sender, EventArgs e)

{

Count();

}

实现下拉列表实验

Course.aspx文件

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

<!DOCTYPE html>

</head>

<body>

<p>

学年：<asp:DropDownList ID="ddlYear" runat="server" AutoPostBack="True">

</asp:DropDownList>

学期：<asp:DropDownList ID="ddlTerm" runat="server" AutoPostBack="True">

</asp:DropDownList>

分院：<asp:DropDownList ID="ddlCollege" runat="server" AutoPostBack="True" Width="120px" OnSelectedIndexChanged="ddlCollege_SelectedIndexChanged">

</asp:DropDownList>

教师<asp:DropDownList ID="ddlTeacher" runat="server" AutoPostBack="True">

</asp:DropDownList>

</p>

</form>

</body>

</html>

Course.aspx.cs文件

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class Course : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

BindYear();

BindTerm();

BindCollege();

BindTeache();

}

protected void BindYear()

{

ddlYear.Items.Clear();

int startYear = DateTime.Now.Year - 10;

int currentYear = DateTime.Now.Year;

for (int i = startYear; i <= currentYear; i++)

{

ddlYear.Items.Add(new ListItem((i-1).ToString()+ "-"+i.ToString()));

}

ddlYear.SelectedValue = (currentYear - 1).ToString() + "-" + currentYear.ToString();

}

protected void BindTerm()

{

ddlTerm.Items.Clear();

for (int i = 1; i <= 2; i++)

{

ddlTerm.Items.Add(i.ToString());

}

protected void BindCollege()

{

ddlCollege.Items.Clear();

ddlCollege.Items.Add(new ListItem("计算机学院"));

ddlCollege.Items.Add(new ListItem("外国语学院"));

ddlCollege.Items.Add(new ListItem("机电学院"));

}

protected void BindTeache()

{

ddlTeacher.Items.Clear();

switch (ddlCollege.SelectedValue)

{

case "计算机学院":

ddlTeacher.Items.Add(new ListItem("曹明"));

ddlTeacher.Items.Add(new ListItem("李妙"));

ddlTeacher.Items.Add(new ListItem("王芳"));

break;

case "外国语学院":

ddlTeacher.Items.Add(new ListItem("张强"));

ddlTeacher.Items.Add(new ListItem("王第男"));

break;

case "机电学院":

ddlTeacher.Items.Add(new ListItem("朱兆清"));

ddlTeacher.Items.Add(new ListItem("毛沁程"));

break;

}

protected void ddlCollege_SelectedIndexChanged(object sender, EventArgs e)

{

BindTeache();

}

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