四个数混合运算，数据库存题，程序集构建三层建构

1.Model类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Model
{

public class TIModel
{
private string number1;
private string number2;
private string number3;
private string number4;
private string operation1;
private string operation2;
private string operation3;
public string Number1
{
get
{
return number1;
}
set
{
number1 = value;
}

}
public string Number2
{
get
{
return number2;
}
set
{
number2 = value;
}

}
public string Number3
{
get
{
return number3;
}
set
{
number3 = value;
}

}
public string Number4
{
get
{
return number4;
}
set
{
number4 = value;
}

}
public string Operation1
{
get
{
return operation1;
}
set
{
operation1 = value;
}
}
public string Operation2
{
get
{
return operation2;
}
set
{
operation2 = value;
}
}
public string Operation3
{
get
{
return operation3;
}
set
{
operation3 = value;
}
}
}
}

2.Tool公共类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace Tool
{

public class SqlDBhelper
{
string constr = "Data Source=.;Initial Catalog=TIKUDB;Integrated Security=True";
public SqlConnection conn = new SqlConnection();
public DataSet ds = new DataSet();
public DataTable dt = new DataTable();
public SqlDataAdapter sda = new SqlDataAdapter();
public void dbcon()//连接数据库！
{

conn = new SqlConnection(constr);

}
public void opens()//打开数据库！
{
conn.Open();
}
public void closes()//关闭数据库！
{
conn.Close();
}
public int Inster(string comstr,SqlParameter[] values)//插入数据！
{
int a = 0;
dbcon();
SqlCommand comm = new SqlCommand(comstr, conn);
if (values != null)
{
comm.Parameters.AddRange(values);
}
opens();
try
{
a = comm.ExecuteNonQuery();

}
finally
{
closes();
}
return a;

}
public DataTable Read(string comstr)//读取数据！
{
dbcon();
sda = new SqlDataAdapter(comstr, conn);
sda.Fill(ds);
dt = ds.Tables[0];
return dt;

}
public int execSql(string comstr)//删除数据！
{
dbcon();
int a = 0;
SqlCommand comm = new SqlCommand(comstr, conn);
opens();
try
{
a = comm.ExecuteNonQuery();
}
finally
{
closes();
}
return a;

}
}
}

　3.　DAL数据库访问类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Tool;
using Model;
using System.Data;
using System.Data.SqlClient;

namespace DAL
{

public class TIDAL
{
SqlDBhelper helper = new SqlDBhelper();
public DataTable Read()
{
string sql = "select * from TI";
return helper.Read(sql);
}
public int InsterTI(TIModel rn)
{
string sql = "insert into TI values(@number1,@operation1,@number2,@operation2,@number3,@operation3,@number4)";
SqlParameter[] parms =
{
new SqlParameter("@number1",rn.Number1),
new SqlParameter("@operation1",rn.Operation1),
new SqlParameter("@number2",rn.Number2),
new SqlParameter("@operation2",rn.Operation2),
new SqlParameter("@number3",rn.Number3),
new SqlParameter("@operation3",rn.Operation3),
new SqlParameter("@number4",rn.Number4)

};
return helper.Inster(sql, parms);
}
public int Delete()
{
string sql = "truncate table TI";
return helper.execSql(sql);
}

}

}

4.BLL业务逻辑类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using Model;
using DAL;

namespace BLL
{

public class TIBLL
{
TIDAL dal = new TIDAL();
public bool Add(TIModel rm)//插入数据
{
if (dal.InsterTI(rm) > 0)
{
return true;
}
else
{
return false;
}
}
public bool Delete()//删除数据
{
if (dal.Delete() > 0)
{
return true;
}
else
{
return false;
}
}
public DataTable Read()
{
return dal.Read();

}
}

}

5.UI层类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace UI
{
interface Iation//定义计算接口
{
double Calation(double a, double b);
}
class Add : Iation//加法
{
public double Calation(double a, double b)
{
return a + b;
}
}
class Sub : Iation//减法
{
public double Calation(double a, double b)
{
return a - b;
}
}
class Mul : Iation//乘法
{
public double Calation(double a, double b)
{
return a * b;
}
}
class Div : Iation//除法
{
public double Calation(double a, double b)
{
if (b == 0)
{
throw new Exception("除数不能为零！");
}
else
{
return a / b;
}
}
}
class Factionsss//实现策略模式！
{
private Iation clation;
public Factionsss(string operation)
{
switch (operation)
{
case "+":
clation = new Add();
break;
case "-":
clation = new Sub();
break;
case "*":
clation = new Mul();
break;
case "/":
clation = new Div();
break;
}

}
public double cal(double a, double b)
{
return clation.Calation(a, b);
}

}
class Calculate
{

public double Result(double a,string operation1,double b,string operation2,double c,string operation3,double d)
{

double answer = 0;

if (operation2 == "+" || operation2 == "-")
{
bool leftPriority;
if (operation1 == "*" || operation1 == "/")
{
leftPriority = true;
}
else if (operation3 == "*" || operation3 == "/")
{
leftPriority = false;
}
else
{
leftPriority = true;
}
if (leftPriority == true)
{
Factionsss faction = new Factionsss(operation1);
double answer1 = faction.cal(a, b);
faction = new Factionsss(operation2);
double answer2 = faction.cal(answer1, c);
faction = new Factionsss(operation3);
answer = faction.cal(answer2, d);

}
else
{
Factionsss faction = new Factionsss(operation3);
double answer1 = faction.cal(c, d);
faction = new Factionsss(operation2);
double answer2 = faction.cal(b, answer1);
faction = new Factionsss(operation1);
answer = faction.cal(a, answer2);

}

}
if (operation2 == "*" || operation2 == "/")
{
bool leftPriority;
if (operation1 == "*" || operation1 == "/")
{
leftPriority = true;
}
else if (operation3 == "*" || operation3 == "/")
{
leftPriority = false;
}
else
{
leftPriority = false;
}
if (leftPriority == true)
{
Factionsss faction = new Factionsss(operation1);
double answer1 = faction.cal(a, b);
faction = new Factionsss(operation2);
double answer2 = faction.cal(answer1, c);
faction = new Factionsss(operation3);
answer = faction.cal(answer2, d);

}
else
{
Factionsss faction = new Factionsss(operation2);
double answer1 = faction.cal(b, c);
faction = new Factionsss(operation3);
double answer2 = faction.cal(answer1, d);
faction = new Factionsss(operation1);
answer = faction.cal(answer2, a);
}

}

return answer;
}
}

}

form1代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Model;
using BLL;

namespace UI
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
TIBLL bll = new TIBLL();
private void Form1_Load(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)//开始
{
TIModel rm = new TIModel();
rm.Number1 = textBox1.Text;
rm.Number2 = textBox2.Text;
rm.Number3 = textBox3.Text;
rm.Number4 = textBox4.Text;
rm.Operation1 = comboBox1.Text;
rm.Operation2 = comboBox2.Text;
rm.Operation3 = comboBox3.Text;
if (bll.Add(rm) == true)
{
MessageBox.Show("保存成功!");

}
else
{
MessageBox.Show("插入失败！");
}
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
textBox4.Clear();
}

private void button2_Click(object sender, EventArgs e)
{
if (bll.Delete() == true)
{
MessageBox.Show("删除失败！");
}
else
{
MessageBox.Show("删除成功！");
}
}

private void button3_Click(object sender, EventArgs e)
{
Form2 fas = new Form2();
fas.ShowDialog();
}

}
}

form2代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Model;
using BLL;

namespace UI
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
TIBLL bll = new TIBLL();
int i=0;
private void Form2_Load(object sender, EventArgs e)
{
Reading();

}

private void button1_Click(object sender, EventArgs e)
{
Reading();
}
private void Reading()
{

DataTable dt = bll.Read();
textBox1.Text = dt.Rows[i][0].ToString().Trim();
label1.Text = dt.Rows[i][1].ToString().Trim();
textBox2.Text = dt.Rows[i][2].ToString().Trim();
label2.Text = dt.Rows[i][3].ToString().Trim();
textBox3.Text = dt.Rows[i][4].ToString().Trim();
label3.Text = dt.Rows[i][5].ToString().Trim();
textBox4.Text = dt.Rows[i][6].ToString().Trim();
i++;
if (i == dt.Rows.Count - 1)
{
MessageBox.Show("你做完了！");
}

}

private void textBox5_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
Calculate calcuate = new Calculate();
double a=double.Parse(textBox1.Text);
double b=double.Parse(textBox2.Text);
double c=double.Parse(textBox3.Text);
double d=double.Parse(textBox4.Text);
string operation1=label1.Text;
string operation2=label2.Text;
string operation3=label3.Text;
double answer = calcuate.Result(a, operation1, b, operation2, c, operation3, d);
if (textBox5.Text == answer.ToString())
{
MessageBox.Show("回答正确！");
}
else
{
MessageBox.Show("回答错误！");
}
textBox5.Clear();
Reading();

}
}
}
}

6,数据库存题测试











7,总结

一开始真的不懂怎么去实现程序集下的三层架构，直到现在依然感觉掌握的很灵活，还有就是四个数的运算，老师让去掉工厂模式，但是去掉工厂模式代码的编写会更加的麻烦，所以就没有去掉工厂模式，但是总感觉这样写程序的性能会大幅度降低，还有就是计算类的存放问题，应该放到哪一个层里面搞不明白，本来想放在业务逻辑层的，但是最终还是放在了UI层！