利用多态实现

Calculate计算类；public  class Calculate    {private double a;//第一个数public double A//封装字段
        {get { return a; }set { a = value; }}private double b;//第二个数字段封装public double B{get { return b; }set { b = value; }}public double result;public virtual double Result()／／利用多态实现简单工厂模式{return result;}}public class Add : Calculate//派生加法类
    {public override double Result()//重写基类中的方法，进行计算
        {result = A + B;return result;}}public class Sub : Calculate{public override double Result(){result = A - B;return result;}}public class Mul : Calculate{public override double Result(){result = A * B;return result;}}public class Div : Calculate{public override double Result(){if (A == 0){MessageBox.Show("分母不能为零");}result = A / B;return result;}}public class Mod : Calculate{public override double Result(){if (A == 0){MessageBox.Show("分母不能为零");}result = A % B;return result;}}public class calculate//运算类型
    {public static Calculate Cal(string type)//派生一个为Calculate类型的Cal
        {Calculate cal = null;switch (type){case "+":cal = new Add();    //加法break;case "-":cal = new Sub();break;case "*":cal = new Mul();break;case "/":cal = new Div();break;case "%":cal = new Mod();break;default:break;}return cal;}}
}

namespace WFCaclualtor
{public  class Sqltest{public string strCon = @"Data Source=.;Initial Catalog=stuDb;Integrated Security=True";public SqlConnection sqlCon = new SqlConnection();public SqlDataAdapter sda = new SqlDataAdapter();public DataSet ds = new DataSet();public DataTable dt = new DataTable();public SqlDataReader sdr;public void dbcon(){try{sqlCon = new SqlConnection(strCon);}catch (Exception e){MessageBox.Show("数据库连接不成功：" + e.ToString());}}public void dbFill(string selstr){dt.Clear();sda = new SqlDataAdapter(selstr, strCon);sda.Fill(ds, "test");dt = ds.Tables["test"];}public void dbSelect(string showInfo){sqlCon.Open();SqlCommand sqlcmd = new SqlCommand(showInfo, sqlCon);sdr = sqlcmd.ExecuteReader();}public void dbInsert(string insertInfo){sqlCon.Open();SqlCommand sqlcmd = new SqlCommand(insertInfo, sqlCon);try{sqlcmd.ExecuteNonQuery();}catch (Exception e){MessageBox.Show("数据插入失败" + e.ToString());}sqlCon.Close();}public void dbGridViewUpd(){SqlCommandBuilder scb = new SqlCommandBuilder(sda);DialogResult result;result = MessageBox.Show("确定保存修改过的数据吗？", "操作提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);if (result == DialogResult.OK){dt = ds.Tables["test"];sda.Update(dt);dt.AcceptChanges();}}public void dbUpdate(string updStr){sqlCon.Open();SqlCommand sqlcmd = new SqlCommand(updStr, sqlCon);try{sqlcmd.ExecuteNonQuery();MessageBox.Show("数据修改成功！");}catch (Exception e){MessageBox.Show("数据库修改失败" + e.ToString());}sqlCon.Close();}public void dbDelete(string delStr){sqlCon.Open();SqlCommand sqlcmd = new SqlCommand(delStr, sqlCon);try{sqlcmd.ExecuteNonQuery();// MessageBox.Show("数据删除成功!");
            }catch (Exception e){MessageBox.Show("数据删除失败" + e.ToString());}sqlCon.Close();}}
}

namespace WFCaclualtor
{public partial class Form1 : Form{Sqltest db = new Sqltest();//-----实例数据库一个对象进行对数据库的操作public static int question = 0;public static int right = 0;public static int fault = 0;public static int t = 0;public static int n = 0;public string path = "C:\rtf";//保存文件路径public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“stuDbDataSet.test”中。您可以根据需要移动或删除它。this.testTableAdapter.Fill(this.stuDbDataSet.test);// TODO: 这行代码将数据加载到表“stuDbDataSet.test”中。您可以根据需要移动或删除它。// this.testTableAdapter.Fill(this.stuDbDataSet.test);label10.Visible = true;label12.Visible = true;decriptionbt.Visible = true;txtresult.Visible = false;saveBt.Visible = false;openbt.Visible = false;}private void time_Tick(object sender, EventArgs e){txtresult.Visible = true;t = Convert.ToInt32(txtTime.Text);time.Interval = 1000;if (t <= 0){time.Enabled = false;MessageBox.Show("时间到！");Form2 frm2 = new Form2();frm2.ShowDialog();}t = t - 1;txtTime.Text = t.ToString();}private void Starbut_Click(object sender, EventArgs e){if (txtTime.Text == ""){MessageBox.Show("请输入计算时间");}else{txtresult.Enabled = true;if (ComChoosetxt.Text == "txt文件"){time.Start();string[] type = new string[100];type = File.ReadAllLines("type.txt");typ1.Text = type[n];string[] one = new string[100];one = File.ReadAllLines("one.txt");txtone.Text = one[n];string[] two = new string[100];two = File.ReadAllLines("two.txt");txttwo.Text = two[n];n++;}else{MessageBox.Show("请选择做题方式！");}}}//——————————————————————开始答题private void txtresult_KeyDown(object sender, KeyEventArgs e){string typ = typ1.Text.Trim();//调用类成员// 多态
           GetCalculate cal;
           cal = InCalculate.Cal(typ)
           cal.A = Convert.ToDouble(txtone.Text.Trim());
           cal.B = Convert.ToDouble(txttwo.Text.Trim());
           double result= cal.Result();if (e.KeyCode == Keys.Enter){if (txtresult.Text == result.ToString())//txtresult="7" result=0?
                {MessageBox.Show("计算正确");right++;LaRigth.Visible = true;RicRight.Visible = true;// RicFault.Text += db.dt.Rows[0][0].ToString() + db.dt.Rows[0][1].ToString() + db.dt.Rows[0][2].ToString() + " " + "\n";RicRight.Text += txtone.Text + typ1.Text + txttwo.Text + label3.Text + txtresult.Text + " " + "✔☺" + "\n";}else{MessageBox.Show("计算错误继续努力");fault++;RicFault.Visible = true;LaFault.Visible = true;//RicFault.Text += db.dt.Rows[0][0].ToString() + db.dt.Rows[0][1].ToString() + db.dt.Rows[0][2].ToString() + " " + "\n";RicFault.Text += txtone.Text + typ1.Text + txttwo.Text + label3.Text + txtresult.Text + " " + "✘☹" + "\n";}question++;txtone.Clear();typ1.Clear();txttwo.Clear();txtresult.Clear();}}//---------------------------------判断计算情况private void removebt_Click(object sender, EventArgs e){switch (ComChoosetxt.Text){case "SQL数据库":db.dbcon();string sqlDeltest = "delete from test where ID='" + ComtestID.Text.ToString().Trim() + "'";txtone.Clear();typ1.Clear();txttwo.Clear();MessageBox.Show("删除成功");db.dbDelete(sqlDeltest);break;case "txt文件":File.WriteAllText("one.txt", string.Empty);File.WriteAllText("two.txt", string.Empty);File.WriteAllText("type.txt", string.Empty);MessageBox.Show("题目已清空请重新出题");richTextBox1.Clear();break;default:break;}} //----------------------------------------删除题目private void Nexttest_Click(object sender, EventArgs e){switch (ComChoosetxt.Text){case "txt文件":FiletestMethod();break;case "SQL数据库":db.dbcon();//向数据库中输入数据string strIntest = "insert into test(ID,one,type,two)values('" + ComtestID.Text + "','" + txtone.Text + "','" +typ1.Text + "','" + txttwo.Text + "')";txtone.Clear();typ1.Clear();txttwo.Clear();MessageBox.Show("请出下一题");db.dbInsert(strIntest);break;default:break;}richTextBox1.Visible = true;txtone.Clear();typ1.Clear();txttwo.Clear();} //---------------------------------------出题private void saveBt_Click(object sender, EventArgs e){//----------------定义一个用来保存文件的对话框SaveFileDialog TxtSaveDialog = new SaveFileDialog();//--------------设置保存文件的过滤参数TxtSaveDialog.Filter = "RTF文件(*.RTF)|*.RTF";//--------------------对于文件是否存在进行判断，另外给出相应的解决措施 if (File.Exists(path)){this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);this.richTextBox1.Clear();}else{if (TxtSaveDialog.ShowDialog() == DialogResult.OK){this.richTextBox1.SaveFile(TxtSaveDialog.FileName, RichTextBoxStreamType.RichText);MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);this.richTextBox1.Clear();}}}//保存文件中的题目private void openbt_Click(object sender, EventArgs e){//------------------------声明一个打开对话框OpenFileDialog txtOpen = new OpenFileDialog();txtOpen.Filter = "RTF文件(*.RTF)|*.RTF";if (txtOpen.ShowDialog() == DialogResult.OK){//打开保存文件的路径path = txtOpen.FileName;this.richTextBox1.LoadFile(txtOpen.FileName, RichTextBoxStreamType.RichText);saveBt.Enabled = false;openbt.Enabled = false;MessageBox.Show("读取成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);}}//打开文件中的题目private void ComtestID_SelectedIndexChanged_1(object sender, EventArgs e){if (txtTime.Text == ""){MessageBox.Show("请输入计算时间");}else{time.Start();db.dbcon();string sqlSetest = "select one,type,two from test where ID='" + ComtestID.Text.ToString().Trim() + "'";db.dbSelect(sqlSetest);while (db.sdr.Read()){txtone.Text = db.sdr["one"].ToString().Trim();typ1.Text = db.sdr["type"].ToString().Trim();txttwo.Text = db.sdr["two"].ToString().Trim();}}}////------------------通过选择题目将题从数据中导入到文本框中private void ComChoosetxt_SelectedIndexChanged(object sender, EventArgs e){switch (ComChoosetxt.Text){case "SQL数据库":label4.Visible = true;label7.Visible = true;ComtestID.Visible = true;Nexttest.Visible = true;openbt.Visible = false;saveBt.Visible = false;Starbut.Enabled = false;break;case "txt文件":label4.Visible = false;label7.Visible = false;ComtestID.Visible = false;Nexttest.Visible = true;openbt.Visible = true;saveBt.Visible = true;Starbut.Enabled = true;break;default: ComChoosetxt.Text = "请选择存题方式";break;}}//选择计算方式private void FiletestMethod(){txtresult.Enabled = false;StreamWriter one = File.AppendText("one.txt");one.WriteLine(txtone.Text);one.Close();StreamWriter ty1 = File.AppendText("type.txt");ty1.WriteLine(typ1.Text);ty1.Close();StreamWriter two = File.AppendText("two.txt");two.WriteLine(txttwo.Text);two.Close();//type = typ1.Text;
richTextBox1.Text += txtone.Text + typ1.Text + txttwo.Text + label3.Text + "" + "\n";txtone.Clear();typ1.Clear();txttwo.Clear();}    //自定义方法将将题目利用File对象写入文件中private void Overbtn_Click(object sender, EventArgs e){Form2 fm2 = new Form2();fm2.ShowDialog();}//-----------------------------------退出程序，计算结束 private void Closebt_Click(object sender, EventArgs e){MessageBox.Show("谢谢使用<☺>");Application.Exit();}//中断或者停止答题，给出计算情况private void decriptionbt_Click(object sender, EventArgs e){label10.Visible = false;decriptionbt.Visible = false;label12.Visible = false;}}

/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{public static int question = 0;public static int right = 0;public static int t;public static string type = "";public static double result = 0;public int n = 0;//文件中的数据   public MainWindow(){InitializeComponent();}private void txtresult_KeyDown(object sender, KeyEventArgs e){

            Calculate cal=null;string typ = typ1.Text.ToString();//调用类成员cal = calculate.Cal(typ);cal.A = Convert.ToDouble(txtone.Text);cal.B= Convert.ToDouble(txttwo.Text);string result = Convert.ToString(cal.Result());

        if (e.Key==Key.Enter){if (txtresult.Text == cal.result.ToString()){righttxt.Visibility = Visibility.Visible;righttxt.Text += txtone.Text + typ.Text + txttwo.Text +Li.Content+ txtresult.Text + "正确√" +""+ "\n";MessageBox.Show("回答正确");txtone.Text = "";txttwo.Text = "";//txtthree.Text = "";txtresult.Text = "";typ.Text = "";//typ2.Text = "";question++;}else{MessageBox.Show("回答错误");faulttxt.Visibility = Visibility.Visible;faulttxt.Text += txtone.Text + typ.Text + txttwo.Text + Li.Content + txtresult.Text + "错误×" + "" + "\n";txtone.Text = "";txttwo.Text = "";//txtthree.Text = "";txtresult.Text = "";typ.Text = "";//typ2.Text = "";
                }question++;}}}
}

public  class Calculate    //抽象类 Calculate{private double a;//第一个数public double A//封装字段{get { return a; }set { a = value; }}private double b;//第二个数字段封装public double B{get { return b; } set { b = value; } } public double result; public virtual double Result() { return result; } } public class Add : Calculate { public override double Result() { result = A + B; return result; } } public class Sub : Calculate { public override double Result() { result = A - B; return result; } } public class Mul : Calculate { public override double Result() { result = A * B; return result; } } public class Div : Calculate { public override double Result() { if (A == 0) { MessageBox.Show("分母不能为零"); } result = A / B; return result; } } public class Mod : Calculate { public override double Result() { if (A == 0) { MessageBox.Show("分母不能为零"); } result = A % B; return result; } } public class calculate { public static Calculate Cal(string type) { Calculate cal =null; switch (type) { case "+": cal = new Add(); //加法 break; case "-": cal = new Sub(); break; case "*": cal = new Mul(); break; case "/": cal = new Div(); break; case "%": cal = new Mod(); break; default: break; } return cal; } } }

后台代码

 protected void calcilate_Click(object sender, EventArgs e){Calculate cal = null;string typ = DDLtype.SelectedValue.ToString();//调用类成员cal = calculate.Cal(typ);//运算类型cal.A = Convert.ToDouble(one.Text);//第一个数cal.B = Convert.ToDouble(two.Text);//第二个数string answer = Convert.ToString(cal.Result());//答案if (result.Text == answer.ToString())//判断计算结果
        {Response.Write("<script>alert('回答正确')</script>");Panel1.GroupingText = one.Text + DDLtype.SelectedValue + two.Text + Label1.Text + result.Text;//将题放入panel中one.Text = "";two.Text = "";result.Text = "";DDLtype.SelectedValue = "请选择计算类型";}else{Response.Write("<script>alert('回答错误')</script>");one.Text = " ";two.Text = " ";result.Text = " ";DDLtype.SelectedValue = "请选择计算类型";}Panel1.Visible = true;}

截图