求ASP.net计算器应用程序代码（用C#语言 Session对象）

求ASP.net计算器应用程序代码（用C#语言 Session对象）

using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

txtSum.Text = "0"; //先给计算器赋一个初始值0

}

//单击数字键

protected void btn0_Click(object sender, EventArgs e) {
if (txtSum.Text == "0")
{
txtSum.Text = "0";

}
else
{
txtSum.Text += "0";
}
}
protected void btn1_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "1";
}
else
{
txtSum.Text += "1";
}
}
protected void btn2_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "2";
}
else
{
txtSum.Text += "2";
}
}
protected void btn3_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "3";
}
else
{
txtSum.Text += "3";
}
}
protected void btn4_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "4";
}
else
{
txtSum.Text += "4";
}
}
protected void btn5_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "5";
}
else
{
txtSum.Text += "5";
}
}
protected void btn6_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "6";
}
else
{
txtSum.Text += "6";
}
}
protected void btn7_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "7";
}
else
{
txtSum.Text += "7";
}
}
protected void btn8_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "8";
}
else
{
txtSum.Text += "8";
}
}
protected void btn9_Click(object sender, EventArgs e)
{
if (txtSum.Text == "0")
{
txtSum.Text = "9";
}
else
{
txtSum.Text += "9";
}
}

//单击运算符号，先判断计算器值是否为0

protected void btnAdd_Click(object sender, EventArgs e)
{
if (txtSum.Text != "0")
{
string sum = txtSum.Text; //定义一个Sum保存第一个要运算的数
Session["Sum"] = sum; //使用Session对象将第一个数保存
string symbols = "+"; //定义一个运算符

Session["Symbols"] = symbols; //使用Session对象将运算符保存
txtSum.Text = "0"; //然后将计算器清空，输入第二个数

}
}

//单击运算符号，先判断计算器值是否为0
protected void btnReduce_Click(object sender, EventArgs e)
{
if (txtSum.Text != "0")
{
string sum = txtSum.Text; // 定义一个Sum保存第一个要运算的数
Session["Sum"] = sum;//使用Session对象将第一个数保存
string symbols = "-";//定义一个运算符
Session["Symbols"] = symbols; //使用Session对象将运算符保存
txtSum.Text = "0";//然后将计算器清空，输入第二个数

}
}

//下面的都是依次像上面解析
protected void btnBy_Click(object sender, EventArgs e)
{
if (txtSum.Text != "0")
{
string sum = txtSum.Text;
Session["Sum"] = sum;
string symbols = "*";
Session["Symbols"] = symbols;
txtSum.Text = "0";

}
}
protected void btnDesides_Click(object sender, EventArgs e)
{
if (txtSum.Text != "0")
{
string sum = txtSum.Text;
Session["Sum"] = sum;
string symbols = "/";
Session["Symbols"] = symbols;
txtSum.Text = "0";

}
}

protected void btnSum_Click(object sender, EventArgs e)
{
string sum = ""; //重新定义一个字符串，提取第一个数
string symbols =(string)Session["Symbols"];//重新定义一个运算符，提取Session里的运算符

int i; //定义一个变量 求和
switch (symbols)
{
case "+":
sum = (string)Session["Sum"];
i = Convert.ToInt32(sum) + Convert.ToInt32(txtSum.Text);
txtSum.Text = Convert.ToString(i);
break;
case "-":
sum = (string)Session["Sum"];
i = Convert.ToInt32(sum) - Convert.ToInt32(txtSum.Text);
txtSum.Text = Convert.ToString(i);
break;
case "*":
sum = (string)Session["Sum"];
i = Convert.ToInt32(sum) * Convert.ToInt32(txtSum.Text);
txtSum.Text = Convert.ToString(i);
break;
case "/":
sum = (string)Session["Sum"];
i = Convert.ToInt32(sum) / Convert.ToInt32(txtSum.Text);
txtSum.Text = Convert.ToString(i);
break;
default:
txtSum.Text = "0";
break;
}

}

//单击清空按钮

protected void btnC_Click(object sender, EventArgs e)
{
txtSum.Text = "0"; //清空计算器
Session["Sum"] = "0"; //清空Session["Sum]

Session["symbols"]="0"; //清空Session["symbols"]

}