四则运算

Code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Collections;


//using System.ComponentModel;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.Web;
using System.Timers;

namespace WindowsApplication10
{
    public partial class Form1 : Form
    {
        private int second = 0;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                int num;
                num = Convert.ToInt32(textBox1.Text);
                if (num < 13)
                {
                    label6.Text = "剩余时间";
                    label8.Text = "秒";
                    button2.Enabled = true;
                    panel1.Controls.Clear();
                    panel1.Refresh();
                    panel5.Controls.Clear();
                    panel5.Refresh();
                    panel2.Controls.Clear();
                    panel2.Refresh();
                    panel3.Controls.Clear();
                    panel3.Refresh();
                    panel4.Controls.Clear();
                    panel4.Refresh();
                    panel6.Controls.Clear();
                    panel6.Refresh();
                    for (int i = 0; i < num; i++)
                    {
                        //int x;
                        //int y;
                        string fuhao;
                        fuhao = comboBox1.SelectedItem.ToString();
                        Label lb1 = new Label();
                        lb1.Location = new Point(0, 16 + i * 25);
                        lb1.Text = "第" + (i + 1).ToString() + "题:";
                        this.panel1.Controls.Add(lb1);
                        Label lb2 = new Label();
                        lb2.Location = new Point(0, 16 + i * 25);
                        //取随机数             
                        Random rm = new Random();
                        StringBuilder sb = new StringBuilder();
                        if (fuhao == "*")
                        {
                            sb.Append(rm.Next(15, 100));
                        }
                        else sb.Append(rm.Next(150, 1000));
                        lb2.Text = sb.ToString();
                        this.panel2.Controls.Add(lb2);


                        Label lb3 = new Label();
                        lb3.Text = comboBox1.SelectedItem.ToString();
                        lb3.Location = new Point(0, 16 + i * 25);
                        this.panel3.Controls.Add(lb3);

                        Label lb4 = new Label();
                        lb4.Location = new Point(0, 16 + i * 25);
                        //取随机数
                        Random rmd = new Random();
                        StringBuilder sbl = new StringBuilder();
                        if (fuhao == "*" || fuhao == "/"||fuhao=="%")
                        {
                            sbl.Append(rmd.Next(10, 100));
                        }
                        else sbl.Append(rmd.Next(100, 1000));
                        lb4.Text = sbl.ToString();
                        this.panel4.Controls.Add(lb4);

                        Label lb5 = new Label();
                        lb5.Text = "=";
                        lb5.Location = new Point(0, 16 + i * 25);
                        this.panel5.Controls.Add(lb5);
                        TextBox tb = new TextBox();
                        tb.Location = new Point(0, 16 + i * 25);
                        this.panel6.Controls.Add(tb);

                    }
                    timer1.Enabled = true;
                    timer1.Interval = 1000;
                    second = Convert.ToInt32(textBox2.Text) * 60;
                }
                else MessageBox.Show("出题数量,请输入12以内的数字");
            }
            catch(Exception ex)
            {
                MessageBox.Show("请输入合法的数字！！");
            }
            finally 
                {
                    label9 .Text ="";
                    label12 .Text ="";
                    panel7.Visible = false;
                }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            label7.Text = "";
            label6.Text = "";
            label8.Text = "";
            label9.Text = "非淡泊无以明志";
           // label9.Font.Style ="Red";
            label12.Text = "非宁静无以致远";
           
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void label3_Click(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            // label5.Text = (Convert .ToInt32( textBox2 .Text)*60 - 1).ToString ();
            if (second >= 0)
            {
                label7.Text = second.ToString();
                second--;
                if (second == 5)
                {
                    MessageBox.Show("时间到.请交试卷");
                }
                if (second == 0)
                {
                    button2.Enabled = false;
                    //button2.Visible = false;
                }
            }
        }

        private void label6_Click(object sender, EventArgs e)
        {

        }

        private void panel4_Paint(object sender, PaintEventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                string time = DateTime.Now.ToString();

                string content = "";
                string faSong;
                int zhengQue = 0;
                int num;
                float zhengQueLv = 0;
                string fuhao;
                fuhao = comboBox1.SelectedItem.ToString();
                num = Convert.ToInt32(textBox1.Text);
                //int count1 = GetLabelCount(panel2);
                //int count2 = GetLabelCount(panel4);
                //int count3 = GetTextBoxCount(panel6);
                ArrayList panel2Text = new ArrayList();
                ArrayList panel4Text = new ArrayList();
                ArrayList panel6Text = new ArrayList();
                foreach (Control ctrl1 in panel2.Controls)
                {
                    if (ctrl1 is Label)
                    {
                        panel2Text.Add(Convert.ToInt32(ctrl1.Text));
                    }
                }
                foreach (Control ctrl2 in panel4.Controls)
                {
                    if (ctrl2 is Label)
                    {
                        panel4Text.Add(ctrl2.Text);
                    }
                }
                foreach (Control ctrl3 in panel6.Controls)
                {
                    if (ctrl3 is TextBox)
                    {
                        panel6Text.Add(Convert.ToInt32(ctrl3.Text));
                    }
                }
                for (int i = 0; i < num; i++)
                {

                    int a = Convert.ToInt32(panel2Text[i]);
                    int b = Convert.ToInt32(panel4Text[i]);
                    int k = 0;
                    if (fuhao == "+")
                        k = a + b;
                    else
                        if (fuhao == "-")
                            k = a - b;
                        else if (fuhao == "*")
                            k = a * b;
                        else if (fuhao == "/")
                            k = a / b;
                        else if (fuhao == "%")
                            k = a % b;
                    if (k == Convert.ToInt32(panel6Text[i]))
                    {
                        zhengQue++;
                    }
                }
                zhengQueLv = ((float)zhengQue / (float)num) * 100;
                MessageBox.Show("共" + num.ToString() + "题；" + "正确的" + zhengQue.ToString() + "道；" + "正确率" + zhengQueLv.ToString() + "%");
                faSong = "共" + num.ToString() + "题；" + "正确的" + zhengQue.ToString() + "道；" + "正确率" + zhengQueLv.ToString() + "%"+"答题时间"+time+"试题类型"+fuhao;
                content = "COMMANDID=05&CORPID=******&CPPW=*******&SOURCEADDRFLAG=1&PHONE=13969191541&SENDTIME=" + time + "&TITLE=sizeyunsuan&CONTENT=" + faSong;
                //post(content);
            }
            catch (Exception ex)
            {
                MessageBox.Show("请输入合法数字答案！！不会的也要填一个数字");
            }
        }
        //短信发送程序
        private void  post(string content)
        {
            string url = "http://61.156.3.58/SendSms800";
            
            Encoding encoding = Encoding.GetEncoding("GB2312");
            byte[] data = encoding.GetBytes(content);

            // 准备请求
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = data.Length;
            Stream newStream = myRequest.GetRequestStream();
            // 发送数据
            newStream.Write(data, 0, data.Length);
            newStream.Close();
           // MessageBox.Show("success");            
        }

        private void panel1_Paint(object sender, PaintEventArgs e)
        {

        }

        private void pictureBox2_Click(object sender, EventArgs e)
        {

        }

        private void label11_Click(object sender, EventArgs e)
        {

        }

        private void label9_Click(object sender, EventArgs e)
        {

        }

        private void label13_Click(object sender, EventArgs e)
        {
            MessageBox.Show("1.出题数量最多为12道"+"\n"+"2.\"/\"是求商，\"%\"是求余数");
        }

    }
   
}