C#项目—模拟考试
C#模拟考试软件开发了一个《模拟考试》的小软件,此小软件练习的目的主要是为了体会编程思想,深度理解高内聚、低耦合,掌握编程思维逻辑的大招,告别垃圾代码,重点体会编程之美,练习时长30分钟;
开发一个项目之前,切记不要打开程序就写代码,首先要做的就是分析项目,从项目的架构开始思考,软件要实现什么功能(思考UI界面布局);数据从哪里获取?(数据库、文本文件、通讯接口...);重点思考项目对象、功能有哪些?(对象的属性、方法,之间的关系...),以此项目为例,思维导图如下:
No1. 软件实现的功能有哪些?(UI如何设计)
答: 用一个主界面实现,有标题栏(项目名称及关闭按钮)、菜单栏(上一题、下一题、提交按钮)、内容显示题目,选项以勾选的方式答题,最后提交得出总分;
No2.数据在哪里获取?
答: 文本文件(是否可靠,避免用户更改源文件,进一步优化—用到的技能:文本文件操作)
No3.对象有哪些,它们之间的关系是什么?
答: 软件运行强相关的对象有试卷、试题、答案(正确答案、错误答案);一张试卷中若干试题(一对多),试题在试卷中以集合的方式存在;试题的答案唯一(一对一),答案在试题中以对象属性的形式存在;
No4.如何设计类(列出属性、方法)?
答: 窗体加载试卷对象(试题加载(答案));从最底层答案类开始设计:
【答案类】
属性:所选答案、正确答案;
/// <summary>
/// 答案类(属性<成员变量>:所选答案、正确答案)
/// </summary>
//实体类需序列化保存
public class Answer
{
public string SelectAnswer { get; set; } = string.Empty;
public string RightAnswer { get; set; } = string.Empty;
}【试题类】
属性:题干、选项、答案(对象属性);
/// <summary>
/// 试题类(属性:题干、答案<对象属性-构造函数初始化>)
/// </summary>
public class Question
{
public Question()//构造函数初始化
{
QueAnswer = new Answer();
}
public string Title { get; set; } = string.Empty;
public string DescriptionA { get; set; } = string.Empty;
public string DescriptionB { get; set; } = string.Empty;
public string DescriptionC { get; set; } = string.Empty;
public string DescriptionD { get; set; } = string.Empty;
public Answer QueAnswer { get; set; }//答案为对象属性
}【试卷类】
属性:试题集合List;
方法:计算总分、读取文本(抽取试题);
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
namespace WindowsFormsApp_试卷抽题.Models
{
/// <summary>
/// 试卷类(属性:试题集合、方法:抽题、分数)
/// </summary>
public class Paper
{
//构造函数初始化(对象属性)
public Paper()
{
questions = new List<Question>();
}
//字段:试题对象集合
private List<Question> questions;
//属性:只读
public List<Question> Questions { get { return this.questions; } }
//方法:分数【遍历试题选择的答案与正确答案相等即可得分】
public int Grade()
{
int score = 0;
foreach (Question item in questions)
{
if (item.QueAnswer.SelectAnswer == string.Empty) continue;
if (item.QueAnswer.SelectAnswer.Equals(item.QueAnswer.RightAnswer)) score += 5;
}
return score;
}
//方法:抽题:【初始化(1.读文件 2.保存为序列化文件 3.打开序列化文件)】
//读文本文件
public void OpenPaper1()
{
FileStream fs = new FileStream("questions.txt", FileMode.Open);
StreamReader sr = new StreamReader(fs, Encoding.Default); //注意默认编码方法
string txtPaper = sr.ReadToEnd();//读取全部内容到txtPaper
string[] txtQuestions = txtPaper.Trim().Split('&');//分割内容保存到试题数组;注意去空格
string[] txtQuestion = null; //保存一道题到txtQuestion
foreach (string item in txtQuestions)
{
txtQuestion = item.Trim().Split('\r');
this.questions.Add(new Question
{
Title = txtQuestion.Trim(),
DescriptionA = txtQuestion.Trim(),
DescriptionB = txtQuestion.Trim(),
DescriptionC = txtQuestion.Trim(),
DescriptionD = txtQuestion.Trim(),
QueAnswer = new Answer { RightAnswer = txtQuestion.Trim() }
});
}
sr.Close();
fs.Close();
}
//保存为序列化文件
public void SavePaper()
{
FileStream fs = new FileStream("Paper.obj", FileMode.Create); //创建文件
BinaryFormatter bf = new BinaryFormatter();//序列化器
bf.Serialize(fs, this.questions);//序列化对象
fs.Close();
}
//打开序列化文件【保存文件后用此方法将独到的数据传递到试题集合中即可】
public void OpenPaper2()
{
FileStream fs = new FileStream("Paper.obj", FileMode.Open); //打开文件
BinaryFormatter bf = new BinaryFormatter(); //序列化器
this.questions = (List<Question>)bf.Deserialize(fs);//反序列化到对象
fs.Close();
}
}
}【边界类】
属性:试卷对象;
方法:显示题目、保存答案、重置答案;
/// <summary>
/// 边界类:试卷对象、题序方法:显示题目、保存答案、重置答案
/// </summary>
public partial class FrmMain : Form
{
//窗口初始化
public FrmMain()
{
InitializeComponent();
this.palCover.Visible = true;
this.lblView.Text = "试卷密封中,等待抽题......";
}
//试卷对象、题序号
private Paper Paper = new Paper();
private int QuestionIndex = 0;
//开始抽题
private void btnStart_Click(object sender, EventArgs e)
{
this.palCover.Visible = false;
//显示第一题
this.Paper.OpenPaper1();//打开txt文件
//this.Paper.SavePaper();//保存文序列化文件
//this.Paper.OpenPaper2(); //反序列化打开试卷
ShowPaper();
}
//提交试卷
private void btnSubmit_Click(object sender, EventArgs e)
{
this.palCover.Visible = true;
//保存答案并判断
SaveAnswer();
int score = this.Paper.Grade();
//显示成绩
this.lblView.Text = $"您的得分是: {score}分";
}
//上一题
private void btnUp_Click(object sender, EventArgs e)
{
if (QuestionIndex == 0) return;
else
{
SaveAnswer();
QuestionIndex--;
ResetAnswer();
ShowPaper();
}
}
//下一题
private void btnDown_Click(object sender, EventArgs e)
{
if (QuestionIndex == Paper.Questions.Count - 1) return;
else
{
SaveAnswer();
QuestionIndex++;
ResetAnswer();
ShowPaper();
}
}
//显示试题
public void ShowPaper()
{
this.lblTiltle.Text = this.Paper.Questions.Title;
this.lblA.Text = this.Paper.Questions.DescriptionA;
this.lblB.Text = this.Paper.Questions.DescriptionB;
this.lblC.Text = this.Paper.Questions.DescriptionC;
this.lblD.Text = this.Paper.Questions.DescriptionD;
}
//保存答案
public void SaveAnswer()
{
string selecetAnswer = string.Empty;
if (this.ckbA.Checked) selecetAnswer += "A";
if (this.ckbB.Checked) selecetAnswer += "B";
if (this.ckbC.Checked) selecetAnswer += "C";
if (this.ckbD.Checked) selecetAnswer += "D";
this.Paper.Questions.QueAnswer.SelectAnswer = selecetAnswer;
}
//重置答案
public void ResetAnswer()
{
this.ckbA.Checked = this.Paper.Questions.QueAnswer.SelectAnswer.Contains("A");
this.ckbB.Checked = this.Paper.Questions.QueAnswer.SelectAnswer.Contains("B");
this.ckbC.Checked = this.Paper.Questions.QueAnswer.SelectAnswer.Contains("C");
this.ckbD.Checked = this.Paper.Questions.QueAnswer.SelectAnswer.Contains("D");
}
//退出
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
}软件效果
思维导图如下所示(重点体会思路,思路清晰代码就成了):
来源:https://www.cnblogs.com/guoenshuo/p/18355969
免责声明:由于采集信息均来自互联网,如果侵犯了您的权益,请联系我们【E-Mail:cb@itdo.tech】 我们会及时删除侵权内容,谢谢合作!
页:
[1]