C#项目—模拟测验 - IT评测·应用市场-qidao123.com

/// <summary>
/// 答案类（属性<成员变量>：所选答案、正确答案）
/// </summary>
[Serializable] //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;
}

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/// <summary>
/// 试题类(属性：题干、答案<对象属性-构造函数初始化>)
/// </summary>
[Serializable]
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
}

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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[0].Trim(),
DescriptionA = txtQuestion[1].Trim(),
DescriptionB = txtQuestion[2].Trim(),
DescriptionC = txtQuestion[3].Trim(),
DescriptionD = txtQuestion[4].Trim(),
QueAnswer = new Answer { RightAnswer = txtQuestion[5].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();
}
}
}

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/// <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[this.QuestionIndex].Title;
this.lblA.Text = this.Paper.Questions[this.QuestionIndex].DescriptionA;
this.lblB.Text = this.Paper.Questions[this.QuestionIndex].DescriptionB;
this.lblC.Text = this.Paper.Questions[this.QuestionIndex].DescriptionC;
this.lblD.Text = this.Paper.Questions[this.QuestionIndex].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[QuestionIndex].QueAnswer.SelectAnswer = selecetAnswer;
}
//重置答案
public void ResetAnswer()
{
this.ckbA.Checked = this.Paper.Questions[this.QuestionIndex].QueAnswer.SelectAnswer.Contains("A");
this.ckbB.Checked = this.Paper.Questions[this.QuestionIndex].QueAnswer.SelectAnswer.Contains("B");
this.ckbC.Checked = this.Paper.Questions[this.QuestionIndex].QueAnswer.SelectAnswer.Contains("C");
this.ckbD.Checked = this.Paper.Questions[this.QuestionIndex].QueAnswer.SelectAnswer.Contains("D");
}
//退出
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
}

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